CN102119494A - Method and apparatus for transmitting uplink signals using multi-antenna - Google Patents

Abstract

A method and apparatus for allowing a UE to transmit uplink signals using a MIMO scheme are disclosed. In order to maintain good Peak power to Average Power Ratio (PAPR) or Cubic Metric (CM) properties when the UE transmits uplink signals using the MIMO scheme, the UE uses a precoding scheme based on a precoding matrix established in a manner that one layer is transmitted to each antenna in specific rank transmission.

Description

Use the method and apparatus of many antenna transmission uplink signal

Technical field

The present invention relates to mobile radio system, relate in particular to communication system based on multiple-input and multiple-output (MIMO) scheme.

Background technology

The MIMO technology is the abbreviation of MIMO technique.The MIMO technology uses a plurality of transmissions (Tx) antenna and a plurality of reception (Rx) antenna to improve the efficient of the transmission and the reception (Tx/Rx) of data.In other words, the MIMO technology allows the transmitting terminal or the receiving terminal of wireless communication system to use a plurality of antennas (hereinafter referred to as many antennas), makes and can improve capacity or performance.For convenience of description, term " MIMO " can also be considered to multi-antenna technology.

In more detail, the MIMO technology does not rely on the single antenna path and receives separate population's message.As an alternative, the MIMO technology is collected a plurality of data slots that receive via a plurality of antennas, merges collected data slot, and finishes conceptual data.As a result, the MIMO technology can increase rate of data signalling in the cell area of pre-sizing, perhaps can the increase system cover when guaranteeing the particular data transfer rate.In this case, the MIMO technology can be widely used in mobile communication terminal, transponder (repeater) etc.The MIMO technology can extended data communication scope, make limited transmission (Tx) data volume that can overcome mobile communication system.

Fig. 1 is the block diagram that general MIMO communication system is shown.

With reference to figure 1, the quantity of the transmission in the transmitter (Tx) antenna is N _T, and the quantity of the reception in the receiver (Rx) antenna is N _RLike this, the theoretical Channel Transmission capacity of the MIMO communication system when transmitter and receiver all use a plurality of antenna uses the theoretical Channel Transmission capacity under the another kind of situation of a plurality of antennas greater than only transmitter or receiver.The theoretical Channel Transmission capacity of MIMO communication system and the quantity of antenna increase pro rata.Thereby, can increase rate of data signalling and frequency efficiency greatly.Suppose that the maximum data transfer rate that obtains is set to R when using individual antenna _o, the rate of data signalling that obtains when using a plurality of antenna can increase scheduled volume in theory, this scheduled volume with multiply by growth rate R ₁Maximum data transfer rate (R _o) corresponding.Growth rate (R ₁) can be by following equation 1 expression.

[equation 1]

R ₁＝min(N _T，N _R)

For example, suppose that mimo system uses four transmission (Tx) antennas and four receptions (Rx) antenna, then mimo system can obtain the very high rate of data signalling higher four times than a single aerial system in theory.After the above-mentioned theory capacity of having proved mimo system in middle nineteen nineties increased, a lot of developers began to further investigate using theoretical capacity to increase the multiple technologies that fully increase rate of data signalling.In the above technology some are reflected in the various wireless communication standard, for example, and 3G (Third Generation) Moblie or next generation wireless lan etc.

Above-mentioned MIMO technology can be divided into space diversity scheme (also be called and send diversity scheme) and spatial multiplex scheme.Space diversity scheme uses the symbol by multiple channel path to increase transmission reliability.Spatial multiplex scheme sends a plurality of data symbols simultaneously via a plurality of transmissions (Tx) antenna, and making increases the transfer rate of data.In addition, also developed the combination of space diversity scheme and spatial multiplexing scheme recently, suitably to obtain the peculiar advantage of two schemes.

About the MIMO technology, a lot of companies or developer have studied multiple MIMO correlation technique in the concentrated area, for example, to under multiple channel circumstance or multiple access access environment, calculating relevant information-theoretical research with the MIMO message capacity, to radio frequency (RF) channel measurement of mimo system and the research of modeling, and the research of signal processing technology when being used to increase transmission reliability and rate of data signalling empty.

In third generation partner program Long Term Evolution (3GPP LTE) system, above-mentioned MIMO scheme only is applied to the downlink signal transmissions of 3GPP LTE system.The MIMO technology can also be applied to uplink signal transmissions.In this case, transmitter structure is changed to realize the MIMO technology, make peak-to-average power ratio (PAPR) or cubic measure (cubic metric) (CM) feature may be worsened.Thereby needing can be with the new technology of MIMO scheme application first downlink signal effectively transmission.

Summary of the invention

Thereby, the present invention relates to be used for method and apparatus via a plurality of antenna transmission uplink signals, it has been eliminated substantially because the restriction of correlation technique and one or more problems that shortcoming causes.

Target of the present invention provides the technology that is used for carrying out effectively according to the MIMO scheme uplink signal transmission.

Other advantages of the present invention, target and feature will partly be set forth in the following description, and to those skilled in the art, partly will become obviously by studying following description, perhaps can know from the practice of the present invention.Target of the present invention and other advantages can realize by the structure that particularly points out in the specification of being write and claim and accompanying drawing and obtain.

In order to realize these targets and other advantages, according to purpose of the present invention, as specializing and wide in range description, be used to subscriber equipment (UE) is comprised via the method for a plurality of antenna transmission uplink signals: the layer that uplink signal is mapped to predetermined quantity at this; To each execution discrete Fourier transform (DFT) (DFT) spread spectrum in the layer signal of predetermined quantity; By selecting specific pre-coding matrix to come the layer signal of DFT spread spectrum is carried out precoding from the code book of storage in advance, this specific pre-coding matrix is set up in each the mode that a layer signal is sent in a plurality of antennas; And the predetermined process that the signal execution of precoding is used to construct single carrier-frequency division multiple access access (SC-FDMA) symbol; And the signal after will handling via a plurality of antenna transmission to the base station (BS).

Specific pre-coding matrix can be the pre-coding matrix of setting up to have the mode of homogeneous transmitted power between a plurality of antennas.Specific pre-coding matrix can be to have the mode of homogeneous transmitted power and the pre-coding matrix set up between the layer with predetermined quantity.

This code book can comprise first kind pre-coding matrix, and wherein, first kind pre-coding matrix can be configured to

Form, be 4 and order 2 pre-coding matrixes that utilized when being set to 2 of order as quantity, and it can satisfy condition when a plurality of antennas

Order 2 pre-coding matrixes may further include the pre-coding matrix that is generated when the position change of each row of first kind pre-coding matrix.

These order 2 pre-coding matrixes may further include: with

The second type pre-coding matrix of form configuration, and with The 3rd type pre-coding matrix of form configuration, wherein, each row of pre-coding matrix can correspond respectively to four antennas in a plurality of antennas, and each row can correspond respectively to layer.

These order 2 pre-coding matrixes may further include the pre-coding matrix that is generated when the position change of each row of first kind pre-coding matrix.

This code book can comprise first kind pre-coding matrix, wherein, first kind pre-coding matrix (as when the quantity of a plurality of antennas be 4 and order 3 pre-coding matrixes that utilized when being set to 3 of order) be configured to

Form, and satisfy condition

These order 3 pre-coding matrixes may further include the pre-coding matrix that is generated when the position change of each row of first kind pre-coding matrix.These order 3 pre-coding matrixes may further include the pre-coding matrix that is generated when the position change of each row of first kind pre-coding matrix.Promptly, code book can comprise and be configured to replacedly ground floor be mapped to first and second antennas and respectively with second and the 3rd layer of pre-coding matrix that maps to third and fourth antenna, as when antenna quantity be 4 and the situation of order when being 3 under employed pre-coding matrix.

When the quantity of antenna is 4, order is 3, and the quantity of code word is 2 o'clock, and a code word is mapped to single layer, and another code word is mapped to two layers.Pre-coding matrix can be configured to make sees that from the angle of layer total transmitted power can be different, so that implement the homogeneous transmitted power between a plurality of antennas.In this case, having greatly effectively, the pre-coding matrix of transmitted power row are mapped to the layer that is mapped to single code word separately.Thereby, be

Under the situation of the pre-coding matrix row of form, first row are mapped to the layer that is mapped to single code word separately, and the second and the 3rd row are mapped to the layer that is mapped to another code word.

This code book can comprise the pre-coding matrix of the varying number that is used for each order.

Can be that unit imports each uplink signal with the code word, and uplink signal can periodically be changed into another layer with the layer that maps to certain code word to the mapping step of the layer of predetermined quantity.This periodic example can be 1 SC-FDMA symbol.

In another aspect of this invention, comprise via the subscriber equipment (UE) of a plurality of antenna transmission uplink signals: a plurality of antennas are used for sending and received signal; Memory is used to store the code book with pre-coding matrix, and this pre-coding matrix is set up in the mode that a layer signal is sent to a plurality of antennas; And processor, be connected to a plurality of antennas and memory, to handle the uplink signal transmission.This processor comprises: the layer mapper, be used for uplink signal map to the predetermined quantity corresponding with specific order the layer; Discrete Fourier transform (DFT) module is used for each the execution DFT spread spectrum to the layer signal of predetermined quantity; Precoder, be used for by selecting specific pre-coding matrix to come the layer signal behind the DFT spread spectrum that receives from the DFT module each is carried out precoding from the code book that is stored in memory, this specific pre-coding matrix is set up in each the mode that a layer signal is sent in a plurality of antennas; And sending module, be used for precoded signal carried out and be used to construct the predetermined process that single carrier-frequency division multiple access inserts (SC-FDMA) symbol, and the signal after will handling via a plurality of antennas is sent to base station (BS).

In this case, this memory can be stored code book.This processor can be carried out antenna conversion (shift) and/or layer conversion with the mode different with the precoding of precoder or line replacement and/or column permutation by pre-coding matrix.

Be appreciated that above-mentioned describe, in general terms of the present invention and following detailed description are schematic and indicative, and aim to provide the of the present invention further explanation of being advocated.

Description of drawings

Be included to provide further understanding of the present invention and accompanying drawing combined and formation the application part to show embodiments of the invention, and be used from explanation principle of the present invention with specification one, in the accompanying drawings:

Fig. 1 is the schematic diagram that general MIMO communication system is shown.

Fig. 2 and Fig. 3 illustrate the general structure based on the transmitter of MIMO technology.

Fig. 4 illustrates to be used for every layer information is carried out precoding and via the schematic diagram of the method for antenna transmission precoding information.

Fig. 5 is the schematic diagram that general SC-FDMA scheme is shown.

Fig. 6 illustrates the schematic diagram that is used for code word is mapped to a plurality of layers method.

Fig. 7 illustrates to be used for carrying out DFT to every layer afterwards carrying out the mapping (that is, code word-layer mapping) of code word to layer, with the schematic diagram of the method for the CM value increase that prevents to be used for each antenna.

Fig. 8 illustrates the schematic diagram that is used for the position of the row or column of pre-coding matrix is carried out method of replacement.

Fig. 9 is the schematic diagram that chordal distance (chordal distance) is shown.

Figure 10 is the block diagram that general base station (BS) and general user's equipment (UE) are shown.

Figure 11 and Figure 12 illustrate the SC-FDMA scheme and the OFDMA scheme that is used for sending in 3GPP LTE system down link signal that is used for sending in 3GPP LTE system uplink signal.

Figure 13 illustrates to be used for making base station (BS) to use the MIMO scheme to send the block diagram of the processor of down link signal in 3GPP LTE system.

Figure 14 is the processor that UE according to an embodiment of the invention is shown.

Embodiment

Now will be to the preferred embodiments of the present invention, the example shown in the accompanying drawings makes detailed reference.Under situation as much as possible, the same reference numbers of using in the accompanying drawing is represented identical or similar part.

The detailed description that provides below with reference to accompanying drawing is intended to disclose exemplary embodiments of the present invention, rather than only embodiment that can realize according to the present invention is shown.Below detailed description comprises specific detail, so that thorough of the present invention to be provided.Yet it will be obvious to those skilled in the art that is not having can to realize the present invention under the situation of this specific detail yet.For example, provided the following description that concentrates on particular term, but the invention is not restricted to this and any other term may be used to represent identical meaning.And under situation as much as possible, same reference numbers is used to indicate identical or similar part in the accompanying drawings.

Peak-to-average power ratio (PAPR) is the parameter of the feature of expression waveform.PAPR is the particular value that obtains during divided by time average root mean square (RMS) value of waveform when the peak amplitude of waveform.PAPR is dimensionless (dimensionless) value.Usually, the PAPR of single-carrier signal is better than the multi-carrier signal.

The LTE-Advanced scheme can realize using single carrier-frequency division multiple access to insert the MIMO technology of (SC-FDMA), to keep good CM performance.When using general precoding, the signal that comprises the information corresponding with a plurality of layers is by multiplexed and send via individual antenna, makes that the signal via this antenna transmission can be considered to a kind of multi-carrier signal.PAPR is relevant with the dynamic range that the power amplifier of transmitter must be supported, and the CM value is another value that can be used as the substitute of PAPR.

Fig. 2 illustrates the general structure based on the transmitter of MIMO technology.

In Fig. 2, one or more code words are mapped to a plurality of layers.In this case, map information is mapped to each physical antenna by precoding processing, and is sent out via each physical antenna then.

Fig. 3 illustrates the detailed diagram based on the transmitter of MIMO shown in Fig. 2.

Term " code word " expression Cyclic Redundancy Check position is affixed to data message and is encoded by the specific coding method then.There is multiple coding method, for example, Turbo code, tail-biting convolutional code (tail biting convolution code) etc.Each code word all is mapped to one or more layers (that is, one or more virtual levels), and the sum of mapped layer equals the order value.In other words, be 3 if send order, the sum that then sends layer also is set to 3.The information that maps to every layer is carried out precoding.In this case, map to every layer data message and be mapped to physical layer (the actual layer of term " layer " expression is as long as it specifies physical layer) here, by precoding processing.Information is sent to each antenna via each physical layer.Under the situation that not shown appointment is explained in Fig. 3, in frequency domain, carry out precoding, and the OFDM information transmission scheme is used to map to the information of physical layer.The information that maps to physical layer is mapped to specific frequency domain, and carries out IFFT then and handle.Afterwards, Cyclic Prefix (CP) is affixed to IFFT result.After this, information is sent to each antenna via radio frequency (RF) chain (chain).

Can carry out precoding processing by matrix multiplication.In each matrix, line number equals the quantity (that is, the quantity of antenna) of physical layer, and columns equals the order value.The order value equals the number of plies, makes columns equal the number of plies.With reference to following equation 2, the information that maps to layer (that is virtual level) is x ₁And x ₂, each element p of (4 * 2) matrix _IjIt is the weight that is used for precoding.y ₁, y ₂, y ₃And y ₄Be the information that maps to physical layer, and be used each OFDM transmission plan via each antenna transmission.

[equation 2]

$\left[\begin{array}{c}{y}_1\\ y_2\\ y_3\\ y_4\end{array}\right]=\left[\begin{array}{cc}{p}_{11}& p_{21}\\ p_{12}& p_{22}\\ p_{13}& p_{23}\\ p_{14}& p_{24}\end{array}\right]\·\left[\begin{array}{c}{x}_1\\ x_2\end{array}\right]$

In the following description, virtual level will be called as layer hereinafter, as long as this use does not cause confusion.Be used for virtual level signal map to operating in hereinafter of physical layer will be called as the operation that is used for layer is mapped directly to antenna.

Method for precoding can mainly be divided into two kinds of methods, that is, and and broadband method for precoding and subband method for precoding.

The broadband method for precoding is as follows.According to the broadband method for precoding, when carrying out precoding in frequency domain, identical pre-coding matrix is applied to all information that send to frequency domain.

Fig. 4 illustrates to be used for every layer information is carried out precoding and via the schematic diagram of the method for antenna transmission precoding information.

With reference to figure 4, can recognize that the information corresponding with a plurality of layers is classified according to the subcarrier of each frequency domain simultaneously by precoding, and the precoding information quilt is via each antenna transmission.All pre-coding matrixes " P " that are used for the broadband method for precoding are equal to each other.

Expansion by the broadband method for precoding provides the subband method for precoding.The subband method for precoding is applied to each subcarrier with multiple pre-coding matrix, and identical pre-coding matrix is not applied to all subcarriers.In other words,, in specific subcarrier, use pre-coding matrix " P ", in all the other subcarriers except specific subcarrier, use another pre-coding matrix " M " according to the subband method for precoding.At this, the element value of pre-coding matrix " P " is different with another pre-coding matrix " M ".

Compare with downlink signal transmissions, the uplink signal transmission is responsive relatively to PAPR or CM performance.Increase by the filter cost that raising caused of PAPR or CM performance may produce more serious problem in subscriber equipment (UE).Thereby the SC-FDMA scheme is used to the uplink signal transmission.

Fig. 5 is the schematic diagram that general SC-FDMA scheme is shown.

As shown in Figure 5, OFDM scheme and SC-FDMA scheme are considered to mutually the same, this is because they all are converted to parallel signal with serial signal, and parallel signal is mapped to subcarrier, mapping signal is carried out IDFT or IFFT processing, to be serial signal through the conversion of signals of IDFT or IFFT processing, (CP) be attached to resulting serial signal with Cyclic Prefix, and sends the CP composite signal via radio frequency (RF) module.Yet, to compare with the OFDM scheme, the SC-FDMA scheme is converted to serial signal with parallel signal, and serial signal is carried out the DFT spread spectrum, makes to have reduced the influence that next IDFT or IFFT handle, and the individual signals feature remained on is higher than predetermine level.

Simultaneously, the reason that the CM value reduces when the MIMO scheme is applied to the uplink signal transmission is as follows.If it is simultaneously overlapped that each all has a plurality of single-carrier signal of good CM characteristic, then overlapped signal may have very poor CM characteristic.Therefore, if the SC-FDMA system uses the single-carrier signal of minimum number or a single-carrier signal to come multiplexed a plurality of layers output information, then can generate transmission signal on the single physical antenna with good CM.

Before the information that will be sent out is carried out precoding, can carry out code word-layer mapping and handle.Because the SC-FDMA scheme is normally used for a transmission mode (1Tx), so the number of plies is 1.Yet if the SC-FDMA scheme is supported the MIMO scheme, the number of plies is a plural number, and can be mapped to a plurality of layers by the code word that single transmission block constitutes.

Fig. 6 illustrates the schematic diagram that code word is mapped to a plurality of layers method.

With reference to figure 6, shine upon if after the DFT that execution is used for the SC-FDMA scheme handles, carry out code word-layer, then the CM value may increase.That is, because before entering the IFFT module, the output signal of DFT piece is through other processing, that is, because that the output signal of DFT piece is divided into is two-layer, so the CM value may increase.

Fig. 7 is illustrated in to carry out code word and carry out DFT to every layer afterwards to the mapping (that is, code word-layer mapping) of layer, with the schematic diagram of the method for the CM value increase that prevents each antenna.

Therefore,, classified based on the number of plies of order value by basis simultaneously, then can keep low CM value if the quantity of DFT piece is changed.That is, the output signal of DFT piece is directly imported the IFFT piece, and without other processing, so that can keep low CM value.Under the situation that reality is implemented, a plurality of layers can be shared single DFT piece.

If by with the transmission of MIMO scheme application first downlink signal, send a plurality of layer signals via individual antenna, then PAPR or CM performance may worsen.In order to overcome the problems referred to above, following examples of the present invention use description to come based on pre-coding matrix the method for design codebooks, by this method, only send a layer signal via individual antenna.

Understand the present invention for convenience of description and better, in transmission system, suppose that the one group of signal that is sent to pre-encoded blocks is set to " x ", and the signal of one group of precoding is set to " y ".In this case, if pre-coding matrix is " P ", then obtain following equation 3.

[equation 3]

Y＝P·x

In equation 3, the dimension of " P " is N _T* N _L, the dimension of " x " is N _L* 1, the dimension of " y " is N _T* 1.In this case, N _TBe the quantity of antenna, and N _LIt is the number of plies.

In the following description, will at first in (I) chapter, describe the principle of the code book that designs the uplink signal transmission that can be applied to the use MIMO scheme of being undertaken, and in (II) chapter, describe the long form of code book then by UE.

I. the principle of code book design

＜2Tx code book 〉

Various embodiments according to the structure of pre-coding matrix included in the code book that uses under the 2Tx pattern below will be described.

Method according to the embodiment of the invention comprises: generate a plurality of streams by code book being mapped to a plurality of layers; And the stream that is generated is carried out precoding, the stream after the precoding is mapped to a plurality of antennas, and via the result of antenna transmission mapping.In this case, code book can be according to following configuration.Pre-coding matrix that uses in order 1 and the pre-coding matrix that uses in order 2 will be described by different way.

2Tx-order 1 pre-coding matrix

Under the situation of 2Tx-order 1, equation 3 can be rewritten as the following equation 4 according to the embodiment of the invention.

[equation 4]

$y=\left[\begin{array}{c}{y}_1\\ y_2\end{array}\right]=P\·x=\left[\begin{array}{c}a\\ b\end{array}\right]\·\left[x_1\right]=\left[\begin{array}{c}{\mathrm{ax}}_1\\ {\mathrm{bx}}_1\end{array}\right]$

Usually, if hypothesis is used the broadband pre-coding scheme, then according to order 1 pre-coding scheme, the specific constant signal with every layer on duty, under the 2Tx pattern via equating under the PAPR of the signal of each antenna transmission and CM value and the 1Tx pattern.Therefore, when using the broadband precoding, PAPR and CM are not subjected to the influence of the value of 2Tx-order 1 pre-coding matrix.

Precoding is to be used to change the method for channel with the structure influence (constructive effect) between the signal that obtains to transmit via each channel.Therefore, improve the transmission performance of each signal.Therefore, " a " of first element of pre-coding matrix P is set to " 1 " shown in the expression equation 4, and second element " b " of pre-coding matrix P can be set to arbitrary value.The signal that transmits via each antenna has equal-wattage, makes that all power amplifiers that are included in each antenna can be used to greatest extent.For this purpose, above-mentioned second element " b " can be that to have absolute value be 1 plural number.In other words, the P shown in the equation 4 can by

Expression.

Existence is to the restriction of the quantity of the included pre-coding matrix of the code book that is used for precoding, this be because transmitting terminal and receiving terminal must have code book and between transmitting terminal and receiving terminal transmission about the information of predetermined pre-coding matrix.Therefore, transmitting terminal and receiving terminal must use the pre-coding matrix of limited quantity.For this operation, have be 1 absolute value and corresponding to+0 ° ,+45 ° ,+90 ° ,+135 ° ,+180 ° ,-135 ° ,-90 ° and-45 ° in any plural number of phase place can be used as each element of pre-coding matrix.That is, in above-mentioned expression formula In, θ can by

Expression.In other words, P can by

Expression.

2Tx-order 2 pre-coding matrixes

Under the situation of 2Tx-order 2, equation 3 can be rewritten as following equation 5.

[equation 5]

$y=\left[\begin{array}{c}{y}_1\\ y_2\end{array}\right]=P\&CenterDot;x=\left[\begin{array}{cc}{p}_{11}& p_{12}\\ p_{21}& {\mathrm{<figure-callout\; id="22"\; label="p"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">p</figure-callout>}}_{22}\end{array}\right]\&CenterDot;\left[\begin{array}{c}{x}_1\\ x_2\end{array}\right]=\left[\begin{array}{c}{p}_{11}{x}_1+p_{12}{x}_2\\ p_{21}{x}_1+p_{22}{x}_2\end{array}\right]$

In equation 5, via the signal y of each antenna transmission _kBy a plurality of input signal x _iConstitute so that the CM value can increase.

In this case, if p ₁₂And p ₂₁In each all be set to zero " 0 ", if perhaps p ₁₁And p ₂₂In each all be set to " 0 ", then have only the signal can be via each antenna transmission.Therefore, if hypothesis signal x _iThe CM value be considered to fine, then the CM value of precoded signal also becomes fine.About Fig. 7, be mapped in code word under the situation of each layer, with the DFT spread spectrum application to the resulting signal that maps to each layer, and carry out the precoding processing that allows each antenna only to send a layer signal, can obtain and once executing IDFT or the identical effect of IFFT processing that DFT handle to carry out, and PAPR or CM characteristic can be remained on kilter.Below will explain its detailed description in the following description.

In this case, if p ₁₂And p ₂₁In each all be set to zero " 0 ", then after the multiplication by constants complex values, the signal corresponding with each layer is via each antenna transmission.As a result, though above-mentioned constant complex values is set to 1, performance is not subjected to the influence of this constant complex values 1.

Thereby equation 5 can be by following equation 6 expressions.

[equation 6]

$y=\left[\begin{array}{c}{y}_1\\ y_2\end{array}\right]=P\&CenterDot;x=\left[\begin{array}{cc}{\mathrm{<figure-callout\; id="11"\; label="p"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">p</figure-callout>}}_{11}& 0\\ 0& {\mathrm{<figure-callout\; id="22"\; label="p"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">p</figure-callout>}}_{22}\end{array}\right]\&CenterDot;\left[\begin{array}{c}{x}_1\\ x_2\end{array}\right]=\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right]\&CenterDot;\left[\begin{array}{c}{x}_1\\ x_2\end{array}\right]=\left[\begin{array}{c}{x}_1\\ x_2\end{array}\right],P\&Element;\left\{\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right]\right\}$

＜4Tx code book 〉

Various embodiments according to the structure of pre-coding matrix included in the code book that uses under the 4Tx pattern below will be described.

Method according to the embodiment of the invention comprises: generate a plurality of streams by code word being mapped to a plurality of layers; And the stream that is generated carried out precoding, the stream after the precoding is mapped to a plurality of antennas, and via the antenna transmission mapping result.In this case, code book can be by following configuration.The pre-coding matrix that uses respectively in order 1, order 2, order 3 and the order 4 will be described in by different way.

4Tx-order 1 pre-coding matrix

Under the situation of 4Tx-order 1, equation 3 can be rewritten as following equation 7.

[equation 7]

$y=\left[\begin{array}{c}{y}_1\\ y_2\\ y_3\\ y_4\end{array}\right]=P\&CenterDot;x=\left[\begin{array}{c}a\\ b\\ c\\ d\end{array}\right]\&CenterDot;\left[x_1\right]=\left[\begin{array}{c}{\mathrm{ax}}_1\\ {\mathrm{bx}}_1\\ {\mathrm{cx}}_1\\ {\mathrm{dx}}_1\end{array}\right]$

Using under the situation of broadband pre-coding scheme in the mode identical, equaling the CM of the signal that under the 1Tx pattern, uses by 4Tx-order 1 precoding processing via the CM of the signal of each antenna transmission with 2Tx-order 1 code book.Therefore, all types of pre-coding matrixes can freely be applied to this CM, and without any problem.

4Tx-order 2 pre-coding matrixes

Under the situation of 4Tx-order 2, equation 3 can be rewritten as following equation 8.

[equation 8]

$y=\left[\begin{array}{c}{y}_1\\ y_2\\ y_3\\ y_4\end{array}\right]=P\&CenterDot;x=\left[\begin{array}{cc}{p}_{11}& p_{12}\\ p_{21}& p_{22}\\ p_{31}& p_{32}\\ p_{41}& p_{42}\end{array}\right]\&CenterDot;\left[\begin{array}{c}{x}_1\\ x_2\end{array}\right]=\left[\begin{array}{c}{p}_{11}{x}_1+p_{12}{x}_2\\ p_{21}{x}_1+p_{22}{x}_2\\ p_{31}{x}_1+p_{32}{x}_2\\ p_{41}{x}_1+p_{42}{x}_2\end{array}\right]$

In 4Tx-order 2 code books, with to the similar mode of 2Tx-order 2 code books, the element-specific of pre-coding matrix is set to zero " 0 " so that be minimized via the overlapping of signal of each antenna transmission, thereby CM can remain on low value.

In equation 8, if hypothesis is via the signal (p of each antenna transmission _K1x ₁+ p _K2x ₂) in p _K1Or p _K2Be set to zero " 0 ", then become via the signal of each antenna transmission and equal the signal that sends from single layer, therefore the CM via the signal of each antenna transmission can remain on low value.

In one embodiment of the invention, be included in the equation 8 " P " can by

Expression.Equation 8 can be rewritten as following equation 9.

[equation 9]

$y=\left[\begin{array}{c}{y}_1\\ y_2\\ y_3\\ y_4\end{array}\right]=P\&CenterDot;x=\left[\begin{array}{cc}{\mathrm{<figure-callout\; id="11"\; label="p"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">p</figure-callout>}}_{11}& 0\\ {\mathrm{<figure-callout\; id="21"\; label="p"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">p</figure-callout>}}_{21}& 0\\ 0& p_{32}\\ 0& p_{42}\end{array}\right]\&CenterDot;\left[\begin{array}{c}{x}_1\\ x_2\end{array}\right]=\left[\begin{array}{c}{p}_{11}{x}_1\\ p_{21}{x}_1\\ p_{32}{x}_2\\ p_{42}{x}_2\end{array}\right]$

With reference to equation 9, have only a layer to be mapped to signal via each antenna transmission.From the angle of single layer, think that 1 precoding of 2Tx-order is applied to the information that sends via this single layer.Thereby, can use 2Tx-order 2 pre-coding matrixes configuration 4Tx-order 2 pre-coding matrixes.In other words, 4Tx-order 2 pre-coding matrixes can be the hypermatrix (super matrix) of 2Tx-order 1 pre-coding matrix.

" P " can be represented by equation 10 for example, according to an embodiment of the invention.

[equation 10]

$X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

Above-mentioned 2Tx-order 1 pre-coding matrix is used to by two antenna applications to single layer signal being sent the method for information.Yet if there are four physical antennas in hypothesis, communication performance may be used to transfer of data according to which kind of combination that two antennas constitute and change.In this case, the selected combination of antenna can change according to the value of pre-coding matrix P.

For example, according to one embodiment of present invention, pre-coding matrix P can be configured to multiple form.Each form can be represented different combination of antennas.

[equation 11]

$P\&Element;\{\left[\begin{array}{cc}1& 0\\ X& 0\\ 0& 1\\ 0& Y\end{array}\right],\left[\begin{array}{cc}1& 0\\ 0& 1\\ X& 0\\ 0& Y\end{array}\right],\left[\begin{array}{cc}1& 0\\ 0& 1\\ 0& Y\\ X& 0\end{array}\right]\}$

In equation 11,, then can improve the performance improvement that causes owing to precoding if suitable value is selected as pre-coding matrix P.If pre-coding matrix is as above disposed, then corresponding with each layer signal uses two antennas that amount in four antennas, and the channel estimating performance among each layer becomes similar each other, and the CM value that is used for each antenna can be minimized.

Usually, though constant value be multiply by the particular column vector of any pre-coding matrix, the feature of pre-coding matrix does not change.Therefore, though constant value be multiply by the particular column of above-mentioned pre-coding matrix, the feature of pre-coding matrix does not change.As a result, the aforesaid operations that is used for constant value be multiply by the particular column vector of pre-coding matrix does not depart from the scope of the present invention.

In addition, if predetermined proportionality factor (scaling factor) be multiply by the pre-coding matrix shown in the equation 11, then multiplied result can be by following equation 12 expressions.

[equation 12]

$P\&Element;\{k\&CenterDot;\left[\begin{array}{cc}1& 0\\ X& 0\\ 0& 1\\ 0& Y\end{array}\right],k\&CenterDot;\left[\begin{array}{cc}1& 0\\ 0& 1\\ X& 0\\ 0& Y\end{array}\right],k\&CenterDot;\left[\begin{array}{cc}1& 0\\ 0& 1\\ 0& Y\\ X& 0\end{array}\right]\}$ $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

4Tx-order 3 pre-coding matrixes (1)

Under the situation of 4Tx-order 3, equation 3 can be rewritten as following equation 13.

[equation 13]

$y=\left[\begin{array}{c}{y}_1\\ y_2\\ y_3\\ y_4\end{array}\right]=P\&CenterDot;x=\left[\begin{array}{ccc}{p}_{11}& p_{12}& p_{13}\\ p_{21}& p_{22}& p_{23}\\ p_{31}& p_{32}& p_{33}\\ p_{41}& p_{42}& p_{43}\end{array}\right]\&CenterDot;\left[\begin{array}{c}{x}_1\\ x_2\\ x_3\end{array}\right]=\left[\begin{array}{c}{p}_{11}{x}_1+p_{12}{x}_2+p_{13}{x}_3\\ p_{21}{x}_1+p_{22}{x}_2+p_{23}{x}_3\\ p_{31}{x}_1+p_{32}{x}_2+p_{33}{x}_3\\ p_{41}{x}_1+p_{42}{x}_2+p_{43}{x}_3\end{array}\right]$

With 4Tx-order 3 pre-coding matrixes of 4Tx-order 2 pre-coding matrix similar fashion in, the element-specific of pre-coding matrix is set to zero " 0 " so that be minimized via the overlapping of signal of each antenna transmission, so CM can remain on low value.

In equation 13, if hypothesis is via the signal (p of each antenna transmission _K1x ₁+ p _K2x ₂+ p _K3x ₃) in p _K1, p _K2, or p _K3Be set to " 0 ", then the CM via the signal of each antenna transmission can remain on low value.

In one embodiment of the invention, be included in the equation 12 " P " can by

Expression.Equation 13 can be rewritten as following equation 14.

[equation 14]

$y=\left[\begin{array}{c}{y}_1\\ y_2\\ y_3\\ y_4\end{array}\right]=P\&CenterDot;x=\left[\begin{array}{ccc}{\mathrm{<figure-callout\; id="11"\; label="p"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">p</figure-callout>}}_{11}& 0& 0\\ 0& {\mathrm{<figure-callout\; id="22"\; label="p"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">p</figure-callout>}}_{22}& 0\\ 0& 0& p_{33}\\ p_{41}& p_{42}& p_{43}\end{array}\right]\&CenterDot;\left[\begin{array}{c}{x}_1\\ x_2\\ x_3\end{array}\right]=\left[\begin{array}{c}{p}_{11}{x}_1\\ p_{22}{x}_2\\ p_{33}{x}_3\\ p_{41}{x}_1+p_{42}{x}_2+p_{43}{x}_3\end{array}\right]$

In order 3, be 3 with the number of plies that is sent out, and the quantity of physical antenna is 4.In this case, each in three antennas can map to single layer independently.At this, have only the signal of single layer can be mapped to a remaining antenna, perhaps the signal of at least two layers can be mapped to a remaining antenna.If have only the signal of specific single layer to be mapped to a remaining antenna, then the CM via the signal of this antenna transmission can have good feature, and is different but communication performance that should be specific single layer may be with another layer.For example, information at ground floor (layer 1) is mapped to first antenna (antenna 1) and the 4th antenna (antenna 4), the information of the second layer (layer 2) is mapped to second antenna (antenna 2), and the information of the 3rd layer (layer 3) is mapped under the situation of third antenna (antenna 3), and what the communication performance of layer 1 information may be with layer 2 or layer 3 is different.

In one embodiment of the invention, in order to minimize the CM value that is used for each antenna in precoding processing, pre-coding matrix P can have the value P shown in the following equation 15 ₁, P ₂, and P ₃In any.

[equation 15]

$P_1=\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& 1\\ X& 0& 0\end{array}\right],P_2=\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& 1\\ 0& Y& 0\end{array}\right],P_3=\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& 1\\ 0& 0& Z\end{array}\right]$

Wherein, $X,Y,Z\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}.$

State pre-coding matrix P in the use ₁, P ₂, and P ₃Situation under, the quantity that is used for the antenna of each layer differs from one another.Yet, if hypothesis pre-coding matrix P ₁, P ₂, and P ₃Be used to send customizing messages equably, rather than used pre-coding matrix P ₁, P ₂, and P ₃In any, the quantity that then is used for the antenna of each layer can be by normalization (normalized).Though in frequency domain, can alternately use pre-coding matrix P ₁, P ₂, and P ₃, but the single-carrier property of the signal that is made of single carrier is destroyed, makes the CM value increase inevitably.Thereby, if pre-coding matrix P ₁, P ₂, and P ₃Alternately be applied to each SC-FDMA symbol, then CM does not have extra increase.Sending under the data conditions, can be that unit decodes to information with a subframe.Therefore, if pre-coding matrix P ₁, P ₂, and P ₃Alternately be applied to each SC-FDMA symbol, then each layer information of the whole information that sends via single subframe can be fifty-fifty via the antenna transmission of equal number.

In another embodiment of the present invention, be changed by the position of the antenna of each layer use, so that performance can be enhanced.The change of aerial position can be carried out along with the time.Especially, can change aerial position at each SC-FDMA symbol place.Below will describe the detailed method that is used to change aerial position in detail.

For example, being expert at and changeing to the another location in the scope of vector in the position of the value in pre-coding matrix except " 0 ", makes can to change to the another location via its position that sends the antenna of each layer signal.As another example, said method can realize that this is because the position displacement is carried out by row/column permutation between the row or column of given pre-coding matrix.

Fig. 8 illustrates the schematic diagram that is used for the position of the row or column of pre-coding matrix is carried out method of replacement.

In more detail, Fig. 8 (a) illustrates the schematic diagram that is used for the position of row is carried out method of replacement, and Fig. 8 (b) is the schematic diagram that is used for the position of row is carried out method of replacement.

In the pre-coding matrix shown in the equation 15, pre-coding matrix P ₁Can be by line replacement and/or column permutation, so that can generate pre-coding matrix P ₂Or P ₃Thereby, such as pre-coding matrix P ₁, P ₂Or P ₃Structure in, can be only obtain new unique pre-coding matrix by line replacement.

Can represent by following formula by the row order that line replacement available under the 4Tx pattern changes.

{1，2，3，4}，{1，2，4，3}，{1，3，2，4}，{1，3，4，2}，

{1，4，2，3}，{1，4，3，2}，{2，1，3，4}，{2，1，4，3}，

{2，3，1，4}，{2，3，4，1}，{2，4，1，3}，{2，4，3，1}，

{3，2，1，4}，{3，2，4，1}，{3，1，2，4}，{3，1，4，2}，

{3，4，2，1}，{3，4，1，2}，{4，2，3，1}，{4，2，1，3}，

{4，3，2，1}，{4，3，1，2}，{4，1，2，3}，{4，1，3，2}

In above-mentioned expression formula, { w, x, y, z} mean that the row vector 1,2,3 and 4 of pre-coding matrix is at given pre-coding matrix P _kRearranged with the order of bracket inner digital under the condition that exists.

By line replacement, the signal corresponding with particular row is mapped to different antennae.By column permutation, can obtain the effect identical with the information of switching different layers.If do not need to distinguish the performance of each layer, then require the system of similar performance not need to utilize column permutation to each layer.Thereby, can only use line replacement to obtain and a day line options corresponding effect.

Simultaneously, given proportionality factor multiply by under the situation of each pre-coding matrix shown in the equation 15, the result can be represented by following equation 16.

[equation 16]

$P_1=k\&CenterDot;\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& 1\\ X& 0& 0\end{array}\right]$ $P_2=k\&CenterDot;\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& 1\\ 0& Y& 0\end{array}\right]$ $P_3=k\&CenterDot;\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& 1\\ 0& 0& Z\end{array}\right],$

$X,Y,Z\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

4Tx-order 3 pre-coding matrixes (2)

Under the situation of 4Tx-order 3, if each antenna only all sends and the information that layer is corresponding, can remain on low value via the CM value of the signal of each antenna transmission, yet, only the information of a layer makes communication performance worsen via antenna transmission only.Thereby, in 4Tx-order 3, need so that the increment of CM can be minimized, can improve communication performance simultaneously with maximum two layers by multiplexed and via the designed code book of mode that individual antenna sends.

According to one embodiment of present invention, when the information corresponding with two layers sent via individual antenna, the pre-coding matrix P shown in the equation 13 can be by the P in the equation 17 ₄Or the P in the equation 18 ₅Expression.

[equation 17]

$P_4=\left[\begin{array}{ccc}1& 0& 1\\ X& 0& Z\\ 0& 1& 0\\ 0& Y& 0\end{array}\right],$ X≠Z， $X,Y,Z\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

[equation 18]

$P_5=\left[\begin{array}{ccc}1& 0& 0\\ X& 1& 0\\ 0& Y& 1\\ 0& 0& Z\end{array}\right],$ $X,Y,Z\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

In equation 17, in order to satisfy order 3, " X " must with pre-coding matrix P ₄In " Z " difference.

Use pre-coding matrix P ₄Or P ₅The shortcoming of method be that the signal that has only single layer is via other antenna transmission, and the signal of two layers is by multiplexed and send via specific antenna.

In one embodiment of the invention, in order to eliminate the problems referred to above, pre-coding matrix P can have the value P shown in the following equation 19 ₆, P ₇And P ₈In any.

[equation 19]

$P_6=\left[\begin{array}{ccc}1& 0& Z\\ X& 1& 0\\ 0& Y& 1\\ A& 0& C\end{array}\right],$ $P_7=\left[\begin{array}{ccc}1& 0& Z\\ X& 1& 0\\ 0& Y& 1\\ 0& B& C\end{array}\right],$ $P_8=\left[\begin{array}{ccc}1& 0& Z\\ X& 1& 0\\ 0& Y& 1\\ A& B& 0\end{array}\right]$

Wherein, $X,Y,Z,A,B,C\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

About pre-coding matrix P ₄, P ₅, P ₆, P ₇Or P ₈, can carry out line replacement and/or column permutation to 4Tx-order 3 pre-coding matrixes.Owing to carry out line replacement and column permutation, the signal that can realize making certain layer by precoding changes function via the antenna selection function and the stratification of any antenna transmission.

In one embodiment of the invention, each column vector of pre-coding matrix can be configured to mutually orthogonal.

If it is mutually orthogonal that each column vector of pre-coding matrix is configured to, then pre-coding matrix can satisfy the characteristic of one-sided unitary matrice (one side unitary matrix).That is, pre-coding matrix P can have the feature by following equation 20 expressions.

[equation 20]

P ^HP＝α·I≠PP ^H

In one embodiment of the invention, can dispose the pre-coding matrix of order 3 with the form of following equation 21.The pre-coding matrix P that is used for satisfied following equation 21 can satisfy the relation shown in the equation 20.

[equation 21]

$P=\left[\begin{array}{ccc}1& 0& 1\\ X& 0& -X\\ 0& 1& 0\\ 0& Y& 0\end{array}\right],$ $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

In equation 21 since satisfy by The relation of expression, so can recognize, matrix P satisfies equation 20.

4Tx-order 4 pre-coding matrixes (1)

Under the situation of 4Tx-order 4, equation 3 can be rewritten as following equation 22.

[equation 22]

$y=\left[\begin{array}{c}{y}_1\\ y_2\\ y_3\\ y_4\end{array}\right]=P\&CenterDot;x=\left[\begin{array}{cccc}{p}_{11}& p_{12}& p_{13}& p_{14}\\ p_{21}& p_{22}& p_{23}& p_{24}\\ p_{31}& p_{32}& p_{33}& p_{34}\\ p_{41}& p_{42}& p_{43}& p_{44}\end{array}\right]\&CenterDot;\left[\begin{array}{c}{x}_1\\ x_2\\ x_3\\ x_4\end{array}\right]=\left[\begin{array}{c}{p}_{11}{x}_1+p_{12}{x}_2+p_{13}{x}_3+p_{14}{x}_4\\ p_{21}{x}_1+p_{22}{x}_2+p_{23}{x}_3+p_{24}{x}_4\\ p_{31}{x}_1+p_{32}{x}_2+p_{33}{x}_3+p_{34}{x}_4\\ p_{41}{x}_1+p_{42}{x}_2+p_{43}{x}_3+p_{44}{x}_4\end{array}\right]$

Under the situation of 4Tx-order 4, from the signal of four layers by multiplexed and via each antenna transmission.

In one embodiment of the invention, if with the form allocating pre-coding matrix of unit matrix, then an antenna can only send and the corresponding signal of single layer.In this case, equation 22 can be rewritten as following equation 23.

[equation 23]

$y=\left[\begin{array}{c}{y}_1\\ y_2\\ y_3\\ y_4\end{array}\right]=P\&CenterDot;x=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right]\&CenterDot;\left[\begin{array}{c}{x}_1\\ x_2\\ x_3\\ x_4\end{array}\right]=\left[\begin{array}{c}{x}_1\\ x_2\\ x_3\\ x_4\end{array}\right]$

4Tx-order 4 pre-coding matrixes (2)

In 4Tx-order 4 code books, if the quantity of order-4 pre-coding matrix increases, then communication performance also can increase.When the quantity of the pre-coding matrix in being included in code book increases, can select more pre-coding matrix near actual channel.Therefore, the quantity of pre-coding matrix is big more, and performance is high more.Yet, in code book, select pre-coding matrix to become complicated, the feasible pre-coding matrix that preferably in such code book, comprises right quantity.Yet, under the situation of 4Tx-order 4, in order only to send via each antenna and the corresponding signal of single layer, pre-coding matrix should be a unit matrix, so that under the situation of using a plurality of order 4 pre-coding matrixes, send via individual antenna in the time of should having with two layers or more a plurality of layers of corresponding signal.Therefore, in order to minimize the quantity of order 4 pre-coding matrixes in CM value and the increase code book, the element-specific of pre-coding matrix can be set to zero " 0 ".In equation 22, if hypothesis is via the signal (p of each antenna transmission _K1x ₁+ p _K2x ₂+ p _K3x ₃+ p _K4x ₄) in p _K1, p _K2, p _K3And p _K4In two values be set to zero " 0 " respectively, then the CM via the signal of each antenna transmission can remain on low value.

In one embodiment of the invention, pre-coding matrix can be set to the P in the following equation 24 ₉, the P in the following equation 25 ₁₀, or following equation 26 in P ₁₁

[equation 24]

$P_9=\left[\begin{array}{cccc}1& A& 0& 0\\ 0& 1& B& 0\\ 0& 0& 1& C\\ D& 0& 0& 1\end{array}\right],1\&NotEqual;\mathrm{ABCD},$

$A,B,C,D\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

[equation 25]

$P_{10}=\left[\begin{array}{cccc}1& 0& 1& 0\\ A& 0& C& 0\\ 0& 1& 0& 1\\ 0& B& 0& D\end{array}\right]$

Wherein, A ≠ C, B ≠ D, $A,B,C,D\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

[equation 26]

${\mathrm{<figure-callout\; id="11"\; label="P"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">P</figure-callout>}}_{11}=\left[\begin{array}{cccc}1& 0& 1& 0\\ A& 0& -A& 0\\ 0& 1& 0& 1\\ 0& B& 0& -B\end{array}\right],$ $A,B\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

Pre-coding matrix P ₉, P ₁₀Or P ₁₁It is the example that is used for via the pre-coding matrix of each antenna transmission signal corresponding with maximum two layers.As mentioned above, to pre-coding matrix P ₉, P ₁₀Or P ₁₁Carry out row/column permutation, the feasible signal that can send different layers via different antennae.

Pre-coding matrix P ₁₁Be unitary matrice, the feasible advantage that can utilize the unitary pre-coding matrix.

4Tx-order 4 pre-coding matrixes (3)

Under the situation of 4Tx-order 4, have only an element can be set to zero " 0 " in the element of every row of pre-coding matrix.Using under the situation of above method, the signal corresponding with three layers can be by multiplexed and send via individual antenna, so that can improve communication performance.Yet, to state in the use under the situation of method, the CM value further increases, but the CM value that is increased can be lower than another CM value that is obtained when all elements in the pre-coding matrix all is set to any other value except that zero " 0 ".Thereby, can under transmitter need not send the good SNR state of data or information with maximum transmit power, not effectively utilize said method.

In one embodiment of the invention, pre-coding matrix P can be by the P in the following equation 27 ₁₂, the P in the following equation 28 ₁₃, the P in the following equation 29 ₁₄, or following equation 30 in P ₁₅Expression.

[equation 27]

${\mathrm{<figure-callout\; id="12"\; label="P"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">P</figure-callout>}}_{12}=\left[\begin{array}{cccc}1& m_{12}& {\mathrm{<figure-callout\; id="13"\; label="m"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">m</figure-callout>}}_{13}& 0\\ 0& 1& m_{23}& m_{24}\\ m_{31}& 0& 1& m_{34}\\ m_{41}& m_{42}& 0& 1\end{array}\right],$

$m_{\mathrm{ik}}\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\},i,k=\mathrm{1,2,3,4}$

[equation 28]

${\mathrm{<figure-callout\; id="13"\; label="P"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">P</figure-callout>}}_{13}=\left[\begin{array}{cccc}1& 0& 1& 1\\ {\mathrm{<figure-callout\; id="21"\; label="m"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">m</figure-callout>}}_{21}& 0& m_{23}& m_{24}\\ 0& 1& m_{33}& m_{34}\\ 0& m_{42}& m_{43}& m_{44}\end{array}\right],$

$m_{\mathrm{ik}}\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\},i,k=\mathrm{1,2,3,4}$

[equation 29]

$P_{14}=\left[\begin{array}{cccc}1& 0& 1& 1\\ {\mathrm{<figure-callout\; id="21"\; label="m"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">m</figure-callout>}}_{21}& 0& m_{23}& m_{24}\\ m_{31}& 0& m_{33}& m_{34}\\ 0& 1& m_{43}& m_{44}\end{array}\right],$ $m_{\mathrm{ik}}\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\},i,k=\mathrm{1,2,3,4}$

[equation 30]

$P_{15}=\left[\begin{array}{cccc}1& 1& 1& 0\\ 0& c& -c& c\\ a& 0& -a& -a\\ b& -b& 0& b\end{array}\right],$ $a,b,c\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

Pre-coding matrix P shown in the equation 30 ₁₅Be unitary matrice, the feasible advantage that can utilize the unitary pre-coding matrix.

The matrix that is obtained when constant be multiply by the particular column of pre-coding matrix or another matrix that is obtained when above-mentioned pre-coding matrix is carried out row/column permutation can be used as the part of code book.

The element of above-mentioned pre-coding matrix be selected from have be 1 absolute value and with+0 ° ,+45 ° ,+90 ° ,+135 ° ,+180 ° ,-135 ° ,-90 ° and-45 ° in the plural number of any corresponding phase place.That is, the element of pre-coding matrix is selected from For example, disclose above-mentioned selection and only be used for illustration purpose, and the element of pre-coding matrix can be selected from, and to have be 1 absolute value and one group of plural number of out of phase.For example, each element of pre-coding matrix can be selected from

(wherein, α is an arbitrary constant).

Power-balance (power balancing)

Simultaneously, the transmitted power of the transmitted power balance of each antenna and/or each layer is equilibrated in the code book design and may be considered to very important problem.If the transmitted power of regulating each antenna for the uniformity (maximal uniformity) of maximum does not then produce performance difference between each transmitting antenna.Similarly, if do not regulate the transmitted power of each layer, then between each code word, produce performance difference for the uniformity of maximum.

Thereby one embodiment of the present of invention have proposed the use all elements corresponding with each antenna of pre-coding matrix, and (that is, all elements of the particular row of pre-coding matrix) norm is considered the antenna power balance, designs the method for pre-coding matrix.In more detail, can utilize the pre-coding matrix shown in the following equation 31 with the form of the antenna power balance shown in the following equation 32.

[equation 31]

[equation 32]

On the other hand, one embodiment of the present of invention provide all elements that uses each layer (that is, all elements of the particular column of pre-coding matrix) norm are considered a layer power-balance, designs the method for pre-coding matrix.In more detail, can utilize the pre-coding matrix shown in the following equation 33 with the form of the layer power-balance shown in the following equation 34.

[equation 33]

[equation 34]

In this case, be different from order 2 pre-coding matrixes, line number in 4Tx-order 3 pre-coding matrixes and columns are unsuitable for carrying out simultaneously antenna power balance and layer power-balance.Yet, under specific circumstances, for example, in the system that uses layer conversion (its layer that will be used for sending according to the specific pattern in the transmission mode is changed into another layer), produced the dispersed effect of performance difference between the layer, layer power-balance possibility ratio antenna power-balance is more inessential relatively.Therefore, one embodiment of the present of invention have proposed to use the pre-coding matrix that is obtained when at first carrying out aerial balance under the condition that can not carry out antenna power balance and layer power-balance simultaneously.

Simultaneously, the following pre-coding matrix in above-mentioned 4Tx-order 3 pre-coding matrixes is represented: because two symbols are sent to each layer, thus can carry out the antenna power balance, represented as following equation 35.

[equation 35]

$P_0^{\&prime;}=k\&CenterDot;\left[\begin{array}{ccc}{\mathrm{<figure-callout\; id="11"\; label="p"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">p</figure-callout>}}_{11}& 0& 0\\ 0& {\mathrm{<figure-callout\; id="22"\; label="p"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">p</figure-callout>}}_{22}& 0\\ 0& 0& p_{33}\\ \frac{p_{41}}{\sqrt{3}}& \frac{p_{42}}{\sqrt{3}}& \frac{p_{43}}{3}\end{array}\right]$ $P_4^{\&prime;}=k\&CenterDot;\left[\begin{array}{ccc}\frac{1}{\sqrt{2}}& 0& \frac{1}{\sqrt{2}}\\ \frac{X}{\sqrt{2}}& 2& \frac{Z}{\sqrt{2}}\\ 0& 1& 0\\ 0& Y& 0\end{array}\right]$ $P_5^{\&prime;}=k\&CenterDot;\left[\begin{array}{ccc}1& 0& 0\\ \frac{X}{\sqrt{2}}& \frac{1}{\sqrt{2}}& 0\\ 0& \frac{Y}{\sqrt{2}}& \frac{1}{\sqrt{2}}\\ 0& 0& Z\end{array}\right]$

Similarly, under the situation of the following pre-coding matrix in 4Tx-order 3 pre-coding matrixes, because only a symbol is sent to an antenna, thus execution level power-balance only, as shown in following formula 36.

[equation 36]

$P_1^{\&prime;}=k\&CenterDot;\left[\begin{array}{ccc}\frac{1}{\sqrt{2}}& 0& 0\\ 0& 1& 0\\ 0& 0& 1\\ \frac{X}{\sqrt{2}}& 0& 0\end{array}\right]$ $P_2^{\&prime;}=k\&CenterDot;\left[\begin{array}{ccc}1& 0& 0\\ 0& \frac{1}{\sqrt{2}}& 0\\ 0& 0& 1\\ 0& \frac{Y}{\sqrt{2}}& 0\end{array}\right]$ $P_3^{\&prime;}=k\&CenterDot;\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& \frac{1}{\sqrt{2}}\\ 0& 0& \frac{Z}{\sqrt{2}}\end{array}\right]$ $P_7^{\&prime;}=k\&CenterDot;\left[\begin{array}{ccc}\frac{1}{\sqrt{3}}& 0& \frac{Z}{\sqrt{3}}\\ \frac{X}{\sqrt{3}}& \frac{1}{\sqrt{2}}& 0\\ 0& \frac{Y}{\sqrt{2}}& \frac{1}{\sqrt{3}}\\ \frac{A}{\sqrt{3}}& 0& \frac{C}{\sqrt{3}}\end{array}\right]$

$P_8^{\&prime;}=k\&CenterDot;\left[\begin{array}{ccc}\frac{1}{\sqrt{2}}& 0& \frac{Z}{\sqrt{3}}\\ \frac{X}{\sqrt{2}}& \frac{1}{\sqrt{3}}& 0\\ 0& \frac{Y}{\sqrt{3}}& \frac{1}{\sqrt{3}}\\ 0& \frac{B}{\sqrt{3}}& \frac{C}{\sqrt{3}}\end{array}\right]$ $P_9^{\&prime;}=k\&CenterDot;\left[\begin{array}{ccc}\frac{1}{\sqrt{3}}& 0& \frac{Z}{\sqrt{2}}\\ \frac{X}{\sqrt{3}}& \frac{1}{\sqrt{3}}& 0\\ 0& \frac{Y}{\sqrt{3}}& \frac{1}{\sqrt{2}}\\ \frac{A}{\sqrt{3}}& \frac{B}{\sqrt{3}}& 0\end{array}\right]$

Simultaneously, according to another embodiment of the present invention,, the present invention proposes 4Tx-order 3 pre-coding matrixes that include the represented following pre-coding matrix of equation 37 from carrying out the viewpoint of antenna power balance and layer power-balance simultaneously.

[equation 37]

${P_0^{\left(1\right)}}^{\&prime;}=\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& 1\\ 0& 0& 0\end{array}\right]$ ${P_0^{\left(2\right)}}^{\&prime;}=\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& 0\\ 0& 0& 1\end{array}\right]$ ${P_0^{\left(3\right)}}^{\&prime;}=\left[\begin{array}{ccc}1& 0& 0\\ 0& 0& 0\\ 0& 1& 0\\ 0& 0& 1\end{array}\right]$ ${P_0^{\left(4\right)}}^{\&prime;}=\left[\begin{array}{ccc}0& 0& 0\\ 1& 0& 0\\ 0& 1& 0\\ 0& 0& 1\end{array}\right]$

In other words, equation 37 illustrates the pre-coding matrix that is used as 4Tx-order 3 pre-coding matrixes, and each pre-coding matrix in the equation 37 is set up as and signal is not sent to single specific antenna.

Simultaneously, the example of the pre-coding matrix that is obtained when to 4Tx-order 3 pre-coding matrix execution level power-balances can be by following equation 38 expressions.

[equation 38]

${\mathrm{<figure-callout\; id="13"\; label="P"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">P</figure-callout>}}_{13}^{\&prime;}=k\&CenterDot;\left[\begin{array}{cccc}\frac{1}{\sqrt{2}}& 0& \frac{1}{2}& \frac{1}{2}\\ \frac{{\mathrm{<figure-callout\; id="21"\; label="m"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">m</figure-callout>}}_{21}}{\sqrt{2}}& 0& \frac{{\mathrm{<figure-callout\; id="23"\; label="m"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">m</figure-callout>}}_{23}}{2}& \frac{m_{24}}{2}\\ 0& \frac{1}{\sqrt{2}}& \frac{m_{33}}{2}& \frac{m_{34}}{2}\\ 0& \frac{m_{42}}{\sqrt{2}}& \frac{m_{43}}{2}& \frac{m_{44}}{2}\end{array}\right]$ $P_{14}^{\&prime;}=k\&CenterDot;\left[\begin{array}{cccc}\frac{1}{\sqrt{3}}& 0& \frac{1}{2}& \frac{1}{2}\\ \frac{{\mathrm{<figure-callout\; id="21"\; label="m"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">m</figure-callout>}}_{21}}{\sqrt{3}}& 0& \frac{{\mathrm{<figure-callout\; id="23"\; label="m"\; filenames="HPA00001310296600072.png"\; state="\{\{state\}\}">m</figure-callout>}}_{23}}{2}& \frac{m_{24}}{2}\\ \frac{m_{31}}{\sqrt{3}}& 0& \frac{m_{33}}{2}& \frac{m_{34}}{2}\\ 0& 1& \frac{m_{43}}{2}& \frac{m_{44}}{2}\end{array}\right]$

The beta pruning of＜code book〉(codebook pruning)

In the 4Tx system, the pre-coding matrix corresponding with order 1, order 2, order 3 and order 4 can be used as the element of the code book that uses in transmitting terminal and receiving terminal.Yet under the situation of using all pre-coding matrixes, the size of code book excessively increases, and making must be in the quantity that property retention is reduced pre-coding matrix in proper level.Below will describe the embodiment of the quantity that can reduce pre-coding matrix in detail.Can be independently or side by side utilize the method for the following pre-coding matrix of restriction.

Codebook element alphabet (alphabet) restriction

From have be 1 absolute value and with+0 ° ,+45 ° ,+90 ° ,+135 ° ,+select each element in the above-mentioned pre-coding matrix 180 ° ,-135 ° ,-90 ° and-45 ° in the plural number of any corresponding phase place.

In one embodiment of the invention, in order to reduce the quantity of pre-coding matrix, each element of pre-coding matrix can be selected from have be 1 absolute value and with+0 ° ,+90 ° ,+180 ° and-90 ° in the plural number of any corresponding phase place.That is, each element in the pre-coding matrix can be selected from 1, j ,-1 ,-j}.

Otherwise, can from the subclass that the alphabetical letter (letter) of the N 8 alphabets of each interval 45 is constituted, extract each element of pre-coding matrix.

Restriction to the unitary pre-coding matrix

Under the mutually orthogonal situation of each column vector in being included in pre-coding matrix, pre-coding matrix can be unitary matrice or part unitary matrice.If pre-coding matrix has above-mentioned feature, then can obtain additional gain.

Therefore, according to one embodiment of present invention, collect unitary matrice or part unitary matrice in all aforementioned pre-coding matrixes, make to form code book.

For example, the pre-coding matrix shown in the following equation 39 and the pre-coding matrix shown in the following equation 40 are carried out row/column permutation, obtaining several matrixes, and the matrix that obtained of combination, make the generation code book.

[equation 39]

$P^{\left(1\right)}=\left[\begin{array}{c}1\\ a\\ b\\ c\end{array}\right],$ $P^{\left(2\right)}=\left[\begin{array}{cc}1& 0\\ a& 0\\ 0& 1\\ 0& b\end{array}\right],$ $P^{\left(3\right)}=\left[\begin{array}{ccc}1& 0& 1\\ a& 0& -a\\ 0& 1& 0\\ 0& b& 0\end{array}\right],$

$P_1^{\left(4\right)}=\left[\begin{array}{cccc}1& 0& 1& 0\\ a& 0& -a& 0\\ 0& 1& 0& 1\\ 0& b& 0& -b\end{array}\right],$ $P_2^{\left(4\right)}=\left[\begin{array}{cccc}1& 1& 1& 0\\ 0& c& -c& c\\ a& 0& -a& -a\\ b& -b& 0& b\end{array}\right],$

Wherein, $a,b,c\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

Restriction to nested structure (nested structure)

When constructing the pre-coding matrix of order 1, order 2, order 3 and order 4, under the situation of the pre-coding matrix that can construct order 2 or order 3 with the column vector of order 4 pre-coding matrixes, the pre-coding matrix of being constructed is called as the pre-coding matrix with nested structure.If specific order 4 pre-coding matrixes are used as the part of precoding codebook, then should dispose order 3 pre-coding matrixes, so that in the structure of pre-coding matrix, produce restriction with the column vector of these specific order 4 pre-coding matrixes.Thereby, can limit codebook size according to aforementioned norm (norm) or standard.

In one embodiment of the invention, the pre-coding matrix of order 1, order 2, order 3 and order 4 has nested structure.

For example, can be with constructing code book by the pre-coding matrix shown in the following equation 40 is carried out the combinations of matrices that row/column permutation obtained.

[equation 40]

$P^{\left(1\right)}=\left[\begin{array}{c}1\\ a\\ b\\ c\end{array}\right],$ $P^{\left(2\right)}=\left[\begin{array}{cc}1& 0\\ a& 0\\ 0& 1\\ 0& b\end{array}\right],$ $P^{\left(3\right)}=\left[\begin{array}{ccc}1& 0& 1\\ a& 0& -a\\ 0& 1& 0\\ 0& b& 0\end{array}\right],$ $P_1^{\left(4\right)}=\left[\begin{array}{cccc}1& 0& 1& 0\\ a& 0& -a& 0\\ 0& 1& 0& 1\\ 0& b& 0& -b\end{array}\right]$

Wherein, $a,b,c\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

Except that the matrix shown in the above-mentioned equation, can also there be other applicable matrixes.Can easily understand, can be by above-mentioned matrix execution line replacement and/or column permutation be obtained applicable matrix.In the present invention, be 0 element because pre-coding matrix has value, so specific antenna can not be mapped to specific inlet flow.This operation can be considered to the antenna selection function.

II. the long form of code book

After this, be designed to satisfy under the situation of above-mentioned code book design rule, be used in the make decision method of the pre-coding matrix that is used for each order that is included in code book of the situation of considering chordal distance describing in detail at code book.

Fig. 9 is the schematic diagram that chordal distance is shown.

As everyone knows, chordal distance is one of norm (or standard) that is used for the performance of more multiple code book collection.At this, the straight line of term " string " expression between 2 on the circumference.Therefore, given two dimension (2D) situation, chordal distance represent to be positioned at circle (distance between 2 on) the circumference for example, unit circle, as shown in Figure 9.

The 4Tx-code book need be considered four-dimensional chordal distance, so that following equation 41 can be used as the chordal distance that is used to select the code book collection.

[equation 41]

$d_c(P,Q)=\frac{1}{\sqrt{2}}{\left|\right|{\mathrm{PP}}^H-{\mathrm{QQ}}^H\left|\right|}_F$

In equation 41, P is P=[v ₁v ₂V _N], and Q is Q=[u ₁u ₂U _N], wherein, v _iAnd u _i(under the situation of 4Tx antenna, i=1,2 ... N N=4) is the principal vector (principal vector) of matrix P and Q respectively.In addition, It is the Frobenius norm of matrix.Can also measure above-mentioned chordal distance by following equation 42.

[equation 42]

$d_c(P,Q)=\frac{1}{\sqrt{2}}{\left|\right|{\mathrm{PP}}^H-{\mathrm{QQ}}^H\left|\right|}_F$

$=\sqrt{n-\mathrm{trace}\left({\mathrm{AA}}^H{\mathrm{BB}}^H\right)}$

Wherein, A and B are the quadrature generator matrixes that is respectively applied for P and Q.

The above-mentioned chordal distance notion of use is described the above-mentioned code book design that is used for based on the 4Tx system of four transmitting antennas.Understand the present invention for convenience of description and better, below express the factor relevant of omitting with power-balance.

Order 2

At first, suppose the following decode basis that can keep good CM performance of use about 4Tx-order 2 systems.

[equation 43]

First group $(\left[\begin{array}{cc}1& 0\\ X& 0\\ 0& 1\\ 0& Y\end{array}\right],\left[\begin{array}{cc}1& 0\\ X& 0\\ 0& 1\\ 0& -Y\end{array}\right],\left[\begin{array}{cc}1& 0\\ -X& 0\\ 0& 1\\ 0& Y\end{array}\right],\left[\begin{array}{cc}1& 0\\ -X& 0\\ 0& 1\\ 0& -Y\end{array}\right])$ $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},\}$

Second group $(\left[\begin{array}{cc}1& 0\\ 0& 1\\ X& 0\\ 0& Y\end{array}\right],\left[\begin{array}{cc}1& 0\\ 0& 1\\ X& 0\\ 0& -Y\end{array}\right],\left[\begin{array}{cc}1& 0\\ 0& 1\\ -X& 0\\ 0& Y\end{array}\right],\left[\begin{array}{cc}1& 0\\ 0& 1\\ -X& 0\\ 0& -Y\end{array}\right])$ $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},\}$

The 3rd group $(\left[\begin{array}{cc}1& 0\\ 0& 1\\ 0& Y\\ X& 0\end{array}\right],\left[\begin{array}{cc}1& 0\\ 0& 1\\ 0& -Y\\ X& 0\end{array}\right],\left[\begin{array}{cc}1& 0\\ 0& 1\\ 0& Y\\ -X& 0\end{array}\right],\left[\begin{array}{cc}1& 0\\ 0& 1\\ 0& -Y\\ -X& 0\end{array}\right])$ $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}}\}$

Though satisfying the quantity of the pre-coding matrix of above-mentioned form can be sizable number, preferably comprise the code book of the pre-coding matrix of predetermined quantity according to rational norm design.The restricted number of below describing the pre-coding matrix proposed to use following norm will be used for each order is to predetermined quantity or method still less.

First norm (norm 1): chordal distance

Second norm (norm 2): whether the expression pre-coding matrix is selected from the reference of each group equably.If the quantity of the pre-coding matrix/vector in the code book can not be eliminated by the group number, consider that then first norm (norm 1) selects the most equably pre-coding matrix.

Above-mentioned norm can not only be applied to order 3 comparably, and the order 4 that is applied to describe subsequently.

In more detail, one embodiment of the present of invention have proposed to use norm 1 from the method about the set of selection pre-coding matrix the code book of specific order.In first step, all pre-coding matrixes in using equation 42 calculating and being included in single code book are to relevant chordal distance.For example, if there are four code book collection, then four minimum chordal distance values can be represented by following formula.

[expression formula]

$d_{c,\min }^1=1,$ $d_{c,\min }^2=0.56,$ $d_{c,\min }^3=0.71\mathrm{and}{d}_{c,\min }^4=1$

In above expression formula,

The value of (wherein, i is a code book collection number) is high more, and systematic function is high more.Therefore, preferably the first and the 4th code book enters the next step of selecting.

In second step,, the present invention proposes the method for selecting pre-coding matrix for each group the most equably in order to support multiple wireless channel environment.For example, according to the method for the present invention that is proposed, if exist three code book groups and 16 pre-coding matrixes of needs, then from two groups, select 5 pre-coding matrixes, and from a remaining group, select 6 pre-coding matrixes as order-2 code book.For example, according to the method for the present invention that is proposed, 5 pre-coding matrixes are selected from preceding two groups, and 6 pre-coding matrixes are selected from last group.One embodiment of the present of invention can be considered the above-mentioned alphabetic(al) method that is used to limit each pre-coding matrix, and wherein, for example, alphabet " X " can be limited to X=1, j, and-1, or-j.Below describe and show exemplary 4Tx order-2 code book that can dispose by above step.

[table 1]

Order-2 code book collection 1-1

Order-2 code book collection 2-1

Order-2 code book collection 3-1

Order-2 code book collection 4-1

Order-2 code book collection 5-1

Order-2 code book collection 6-1

Order-2 code book collection 7-1

Order-2 code book collection 8-1

Order-2 code book collection 9-1

Order-2 code book collection 10-1

Order-2 code book collection 11-1

Order-2 code book collection 12-1

Above-mentioned code book shown in the open table 1 only is used for illustration purpose, and line replacement and/or column permutation can be applied to all pre-coding matrixes or some pre-coding matrixes.

If 4Tx order-2 code book comprises 15 pre-coding matrixes, then can among each pre-coding matrix group, select to remove a pre-coding matrix the group of pre-coding matrix of maximum quantity.Exemplary 4Tx order-2 code book that illustrates by the such scheme configuration is below described.

[table 2]

Order-2 code book collection 1-2

Order-2 code book collection 2-2

Order-2 code book collection 3-2

Order-2 code book collection 4-2

Order-2 code book collection 5-2

Order-2 code book collection 6-2

Order-2 code book collection 7-2

Order-2 code book collection 8-2

Order-2 code book collection 9-2

Order-2 code book collection 10-2

Order-2 code book collection 11-2

Order-2 code book collection 12-2

Code book shown in the open table 2 also is only to be used for illustration purpose, can carry out line replacement and/or column permutation to all pre-coding matrixes in the code book or some pre-coding matrixes.

Order 3-first embodiment

In order to design 4Tx order-3 code book, suppose to use following three pre-coding matrix groups to keep good CM characteristic.For convenience of description, omit the factor relevant at this with power-balance.

[equation 44]

The 1st group

$(\left[\begin{array}{ccc}1& 0& 1\\ X& 0& -X\\ 0& 1& 0\\ 0& Y& 0\end{array}\right],\left[\begin{array}{ccc}1& 0& 1\\ X& 0& -X\\ 0& 1& 0\\ 0& -Y& 0\end{array}\right],\left[\begin{array}{ccc}0& 1& 0\\ 0& X& 0\\ 1& 0& 1\\ Y& 0& -Y\end{array}\right],\left[\begin{array}{ccc}0& 1& 0\\ 0& -X& 0\\ 1& 0& 1\\ Y& 0& -Y\end{array}\right])$ $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}}\}$

The 2nd group

$(\left[\begin{array}{ccc}1& 0& 1\\ 0& 1& 0\\ X& 0& -X\\ 0& Y& 0\end{array}\right],\left[\begin{array}{ccc}1& 0& 1\\ 0& 1& 0\\ X& 0& -X\\ 0& -Y& 0\end{array}\right],\left[\begin{array}{ccc}0& 1& 0\\ 1& 0& 1\\ 0& X& 0\\ Y& 0& -Y\end{array}\right],\left[\begin{array}{ccc}0& 1& 0\\ 1& 0& 1\\ 0& -X& 0\\ Y& 0& -Y\end{array}\right])$ $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}}\}$

The 3rd group

$(\left[\begin{array}{ccc}1& 0& 1\\ 0& 1& 0\\ 0& Y& 0\\ X& 0& -X\end{array}\right],\left[\begin{array}{ccc}1& 0& 1\\ 0& 1& 0\\ 0& -Y& 0\\ X& 0& -X\end{array}\right],\left[\begin{array}{ccc}0& 1& 0\\ 1& 0& 1\\ Y& 0& -Y\\ 0& X& 0\end{array}\right],\left[\begin{array}{ccc}0& 1& 0\\ 1& 0& 1\\ Y& 0& -Y\\ 0& -X& 0\end{array}\right])$ $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}}\}$

Under the situation of order 3, the present invention proposes with the method for the mode identical according to above-mentioned norm 1 and norm 2 structure code books with order 2.In more detail, use equation 42 calculate with code book in available all pre-coding matrixes make up relevant chordal distance, can select to have the set of the minimum number of largest chord distance then.In addition, the present invention proposes the method for from each group (the 1st group, the 2nd group or the 3rd group), selecting pre-coding matrix the most equably.If the letter represented by the pre-coding matrix component of each group be limited to (1, j ,-1 ,-j), then can obtain to satisfy minimum chordal distance

Following code book.

[table 3]

Order-3 code book collection 1-1

Order-3 code book collection 2-1

Order-3 code book collection 3-1

Order-3 code book collection 4-1

Order-3 code book collection 5-1

Order-3 code book collection 6-1

Order-3 code book collection 7-1

Order-3 code book collection 8-1

All pre-coding matrixes or some pre-coding matrixes that should be noted that the above-mentioned code book shown in can his-and-hers watches 3 are carried out line replacement and/or column permutation.

Be included in order-3 code book iff 15 pre-coding matrixes, then from the code book shown in the table 3, remove a pre-coding matrix in the group of the pre-coding matrix of among each group, having selected maximum quantity, make that the result after removing can dispose as shown in the following table 4.

[table 4]

Order-3 code book collection 1-2

Order-3 code book collection 2-2

Order-3 code book collection 3-2

Order-3 code book collection 4-2

Order-3 code book collection 5-2

Order-3 code book collection 6-2

Order-3 code book collection 7-2

Order-3 code book collection 8-2

Should be noted that all above-mentioned pre-coding matrixes or some the above-mentioned pre-coding matrixes shown in can his-and-hers watches 4 carry out line replacement and/or column permutation.

Order 3-second embodiment

In one embodiment of the invention, below will describe and use 6 pre-coding matrix groups keeping good CM characteristic to construct the method for code book.Be used to keep six 4Tx order-3 pre-coding matrix groups of good CM characteristic to represent by following equation 45.

[equation 45]

The 1st group

The 2nd group

The 3rd group

The 4th group

The 5th group

The 6th group

Wherein, $X\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

The example of order-3 code book that comprises 24 pre-coding matrixes in 6 groups shown in the equation 45 has been shown in the following table 5.In order to reduce complexity, in the example shown in the table 5, be restricted to 1 by the letter of pre-coding matrix element representation ,-j ,-1 and-j.

[table 5]

For another example, the present invention proposes the method for the remaining set of utilization except the 4th group (the 4th group), generate the 4th group (the 4th group) by first group (the 1st group) that column permutation is applied in all groups shown in the equation 45.Usually, if three column vectors then can be generated such as [c1, c3, c2] by [c1, c2, c3] expression, [c2, c1, c3], and [c2, c3, c1], 5 column permutation matrixes of [c3, c2, c1] and [c3, c1, c2], thus can obtain 6 matrixes.

The above-mentioned reason of specific vector permutation matrix of not using is that the sequence of coding is mapped to the particular column vector (or certain layer) of pre-coding matrix.The code word of supposing two absolute codings in the above-mentioned pre-coding matrix group is mapped to different layers, and is as described below.

(1) first code word is mapped to ground floor.

(2) second code words are distributed equably and are mapped to the second layer and the 3rd layer.

Suppose to use above code word-layer mapping, then the particular column displacement does not produce the difference of the average SINR between the different code words.For example, the displacement from column vector [c1, c2, c3] to another column vector [c1, c3, c2] can represent to have only the layer of second code word to be exchanged.Like this, the exchange between two-layer (wherein, identical second code word is distributed equably and shines upon) does not cause performance change.For the system that utilizes the SIC receiver, being correctly decoded of code word causes performance to improve during the transmission of given a plurality of code words.This is because code word once is correctly decoded.So, can use the codeword information that is correctly decoded to eliminate space layer and disturb.By under the normalized situation equably, some column vectors of pre-coding matrix can have bigger transmitted power in the transmitted power of a plurality of antennas.Send under the situation that does not have layer conversion/displacement between the layer at all, have the certain layer corresponding with column vector and can have preferable performance than the column vector of the pre-coding matrix of transmitted power greatly.On all layers that sent, do not exist under the situation of layer conversion/displacement, in order to make full use of the SIC receiver, the ground floor that first code word is mapped to separately is mapped to the pre-coding matrix column vector with big transmitted power, and is mapped to the second layer and the 3rd layer second code word and is mapped to and compares the precoding vector row with relative little transmitted power with ground floor.Under the situation of using above code word-layer mapping, can use the pre-coding matrix shown in [equation 46] further to improve performance under the situation of use serial interference elimination (SIC) receiver algorithm.

[equation 46]

The 1st group

The 2nd group

The 3rd group The 4th group

The 5th group

Wherein, $X\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

Following code book is exemplary 4Tx order-3 code book, and the letter that wherein each all will be included in each above pre-coding matrix is restricted to 1, j ,-1 and-j, and comprise 20 pre-coding matrixes.

[table 6]

Simultaneously, according to another embodiment of the present invention, the quantity that obtains the required pre-coding matrix of optimum performance from high order has the code book that is less than 24 pre-coding matrixes less than the quantity that obtains the required pre-coding matrix of optimum performance from low-rank so that the present invention can be restricted to order-3 code book.In this case, the present invention can use norm 2 to select pre-coding matrix equably from 6 pre-coding matrix groups.

[table 7]

From the example of table 7 as can be seen, if e ^{-j θ}Multiply by the particular column vector, then the column permutation in the pre-coding matrix makes the quantity that is included in the pre-coding matrix in the code book be restricted to 12 to the not influence of improvement of performance.Simultaneously, according to one embodiment of present invention, can carry out the antenna displacement, to obtain a day line options gain.Can also realize the antenna displacement by the line replacement that is included in the pre-coding matrix in the above-mentioned code book.

Order 3-the 3rd embodiment

In the third embodiment of the present invention, suppose that following 6 pre-coding matrix groups are considered to keep the pre-coding matrix of good CM performance.

[equation 47]

The 1st group $\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& 1\\ X& 0& 0\end{array}\right],\left[\begin{array}{ccc}0& 1& 0\\ 1& 0& 0\\ 0& 0& 1\\ 0& X& 0\end{array}\right],\left[\begin{array}{ccc}0& 0& 1\\ 0& 1& 0\\ 1& 0& 0\\ 0& 0& X\end{array}\right]$

The 2nd group $\left[\begin{array}{ccc}0& 1& 0\\ 1& 0& 0\\ 0& 0& 1\\ X& 0& 0\end{array}\right],\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& 1\\ 0& X& 0\end{array}\right],\left[\begin{array}{ccc}0& 1& 0\\ 0& 0& 1\\ 1& 0& 0\\ 0& 0& X\end{array}\right]$

The 3rd group $\left[\begin{array}{ccc}0& 0& 1\\ 0& 1& 0\\ 1& 0& 0\\ X& 0& 0\end{array}\right],\left[\begin{array}{ccc}0& 0& 1\\ 1& 0& 0\\ 0& 1& 0\\ 0& X& 0\end{array}\right],\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& 1\\ 0& 0& X\end{array}\right]$

The 4th group $\left[\begin{array}{ccc}0& 1& 0\\ 0& 0& 1\\ 1& 0& 0\\ 0& X& 0\end{array}\right],\left[\begin{array}{ccc}0& 0& 1\\ 1& 0& 0\\ 0& 1& 0\\ 0& 0& X\end{array}\right]$

The 5th group $\left[\begin{array}{ccc}1& 0& 0\\ X& 0& 0\\ 0& 0& 1\\ 0& 1& 0\end{array}\right],\left[\begin{array}{ccc}0& 1& 0\\ 0& X& 0\\ 0& 0& 1\\ 1& 0& 0\end{array}\right],\left[\begin{array}{ccc}0& 0& 1\\ 0& 0& X\\ 1& 0& 0\\ 0& 1& 0\end{array}\right]$

The 6th group $\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ X& 0& 0\\ 0& 0& 1\end{array}\right],\left[\begin{array}{ccc}0& 1& 0\\ 1& 0& 0\\ 0& X& 0\\ 0& 0& 1\end{array}\right],\left[\begin{array}{ccc}0& 0& 1\\ 0& 1& 0\\ 0& 0& X\\ 1& 0& 0\end{array}\right]$

Wherein, $X\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

Under the situation of first group (the 1st group) in equation 47, can recognize that three permutation matrixes are selected from [c1, c3, c2], [c2, c1, c3], [c2, c3, c1], [c3, c2, c1] and [c3, c1, c2].Under the situation of the 4th group (the 4th group), can recognize that the pre-coding matrix of a composition is excluded, because the pre-coding matrix of being got rid of has been included in first group (the 1st group).Preferably when execution level conversion operations not, utilize the 3rd embodiment.The 3rd embodiment can use the code book that comprises the pre-coding matrix collection of having carried out column permutation to realize layer conversion.Thereby information sequence can be mapped to all layers, makes that the SINR difference of interlayer can be by normalization.

The 3rd embodiment can use first norm (norm 1) and second norm (norm 2) to select pre-coding matrix.

Order 3-the 4th embodiment

The 4th embodiment thinks that following three groups is the pre-coding matrix group that is used to keep good CM characteristic.

[equation 48]

$G1=\left[\begin{array}{ccc}1& 0& a\\ X& 0& b\\ 0& 1& c\\ 0& Y& d\end{array}\right],$ $G2=\left[\begin{array}{ccc}1& 0& a^{\&prime;}\\ 0& 1& b^{\&prime;}\\ X& 0& c^{\&prime;}\\ 0& Y& d^{\&prime;}\end{array}\right],$ $G3=\left[\begin{array}{ccc}1& 0& a^{\&prime;\&prime;}\\ 0& 1& b^{\&prime;\&prime;}\\ 0& Y& c^{\&prime;\&prime;}\\ X& 0& d^{\&prime;\&prime;}\end{array}\right],$

Wherein, $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

Last column vector in the pre-coding matrix group shown in the equation 48

Can be different pre-coding matrixes, such as based on precoding vector/matrix of DFT or based on precoding vector/matrix of bold and unconstrained Si Huoerde (household).For example, the example of last vector can be order-1 code book of 3GPP LTE system (distribution version 8 systems).Preferably, in order to keep matrix

Quadrature/part feature at the tenth of the twelve Earthly Branches, matrix

With

Must satisfy feature at the tenth of the twelve Earthly Branches.Similarly, matrix

Matrix

And matrix

And matrix

Matrix

With

Must satisfy feature at the tenth of the twelve Earthly Branches.This means that parameter must satisfy following relation.

[equation 49]

In the 1st group: a=1, b=-X, and c=-dY ^*

In the 2nd group: a '=1, b '=-X, and c '=-d ' Y ^*

In the 3rd group: a "=1, b "=-X, and c "=-d " Y ^*

In this case, though specific complex constant be multiply by each column vector of specific pre-coding matrix, this means that multiplied result represents identical pre-coding matrix, so hypothesis a, a ', or a " are set to 1.

Situation when preferably, the 4th embodiment can be applied to the execution level displacement.Stratification changes operation expression customizing messages sequence and is recycled mapping and is sent to all layers, makes the SINR performance difference of each layer by normalization.If in different layers, use equal-wattage,, has the highest power with the data sequence of the corresponding last layer of the last row that do not have 0 value then from the viewpoint of precoding output signal.

Do not using stratification to change and using under the situation of enhancement mode SIC receiver algorithm, the layer that first code word is mapped to preferably should to be relatively higher than the precoding vector row of other precoding vectors row corresponding with transmitted power.Under the situation of [equation 48], the 3rd row can have the transmitted power bigger than other row.Be mapped to ground floor for first row, secondary series is mapped to the second layer, and the 3rd row are mapped to the 3rd layer situation, can use [equation 48a] to replace [equation 48].This pre-coding matrix structure will allow do not using stratification to change and using under the situation of SIC receiver and improve performance, and this is because during given a plurality of codeword transmission, the probability that is correctly decoded of whole codeword improves.

[equation 48a]

$G1=\left[\begin{array}{ccc}a& 0& 1\\ b& 0& X\\ c& 1& 0\\ d& Y& 0\end{array}\right],$ $G2=\left[\begin{array}{ccc}{a}^{\&prime;}& 0& 1\\ b^{\&prime;}& 1& 0\\ c^{\&prime;}& 0& X\\ d^{\&prime;}& Y& 0\end{array}\right],$ $G3=\left[\begin{array}{ccc}{a}^{\&prime;\&prime;}& 0& 1\\ b^{\&prime;\&prime;}& 1& 0\\ c^{\&prime;\&prime;}& 0& X\\ d^{\&prime;\&prime;}& Y& 0\end{array}\right]$

Wherein, $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

Order 3-the 5th embodiment

In the 5th embodiment, suppose that following group shown in the equation 50 is used as the pre-coding matrix group that keeps good CM performance.

[equation 50]

$G1=\left(\left[\begin{array}{ccc}1& 0& a\\ X& 0& b\\ 0& 1& c\\ 0& Y& d\end{array}\right]\left[\begin{array}{ccc}0& 1& a\\ 0& X& b\\ 1& 0& c\\ Y& 0& d\end{array}\right]\left[\begin{array}{ccc}a& 0& 1\\ b& 0& X\\ c& 1& 0\\ d& Y& 0\end{array}\right]\right)$

$G2=\left(\left[\begin{array}{ccc}1& 0& a^{\&prime;}\\ 0& 1& b^{\&prime;}\\ X& 0& c^{\&prime;}\\ 0& Y& d^{\&prime;}\end{array}\right]\left[\begin{array}{ccc}0& 1& a^{\&prime;}\\ 1& 0& b^{\&prime;}\\ 0& X& c^{\&prime;}\\ Y& 0& d^{\&prime;}\end{array}\right]\left[\begin{array}{ccc}{a}^{\&prime;}& 0& 1\\ b^{\&prime;}& 1& 0\\ c^{\&prime;}& 0& X\\ d^{\&prime;}& Y& 0\end{array}\right]\right)$

$G3=\left(\left[\begin{array}{ccc}1& 0& a^{\&prime;\&prime;}\\ 0& 1& b^{\&prime;\&prime;}\\ 0& Y& c^{\&prime;\&prime;}\\ X& 0& d^{\&prime;\&prime;}\end{array}\right]\left[\begin{array}{ccc}0& 1& a^{\&prime;\&prime;}\\ 1& 0& b^{\&prime;\&prime;}\\ Y& 0& c^{\&prime;\&prime;}\\ 0& X& d^{\&prime;\&prime;}\end{array}\right]\left[\begin{array}{ccc}{a}^{\&prime;\&prime;}& 0& 1\\ b^{\&prime;\&prime;}& 1& 0\\ c^{\&prime;\&prime;}& Y& 0\\ d^{\&prime;\&prime;}& 0& X\end{array}\right]\right)$

Wherein, $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

A plurality of pre-coding matrixes that pre-coding matrix group shown in the equation 50 is obtained when the structure of the 4th embodiment is carried out line replacement or column permutation constitute.Column vector in the pre-coding matrix group shown in the equation 50 Can be different pre-coding matrixes, such as based on precoding vector/matrix of DFT or based on precoding vector/matrix of bold and unconstrained Si Huoerde.For example, the example of above column vector can be order-1 code book of 3GPP LTE system (distribution version 8 systems).

Be similar to the 4th embodiment, in the 5th embodiment, preferably the pre-coding matrix vector is orthogonal, and in all column vectors of each pre-coding matrix group except that being that element first value of 0 all is set to 1.

Comprise the pre-coding matrix that is generated when the pre-coding matrix of the 4th embodiment carried out column permutation according to the code book of the 5th embodiment.As mentioned above, the pre-coding matrix with column vector [c1, c2, c3] can have 6 column permutation pre-coding matrixes, such as [c1, c3, c2], and [c2, c1, c3], [c2, c3, c1], [c3, c2, c1], [c3, c1, c2] and [c3, c1, c2].

The reason that does not comprise particular column displacement is, the second and the 3rd column permutation that first code word is mapped to the pre-coding matrix in the system that ground floor and second code word be distributed and mapped to the second layer and the 3rd layer does not cause the difference on the performance.

Order 3-the 6th embodiment

The form that is obtained so that the pre-coding matrix of the code book shown in the 4th embodiment is carried out line replacement disposes the pre-coding matrix according to the 6th embodiment, because can switch the pre-coding matrix that obtains the 6th embodiment by antenna.

Pre-coding matrix according to the 6th embodiment can be by following equation 51 expressions.

[equation 51]

$G1=\left(\left[\begin{array}{ccc}1& 0& a\\ X& 0& b\\ 0& 1& c\\ 0& Y& d\end{array}\right]\left[\begin{array}{ccc}X& 0& b\\ 1& 0& a\\ 0& 1& c\\ 0& Y& d\end{array}\right]\left[\begin{array}{ccc}0& 1& c\\ X& 0& b\\ 1& 0& a\\ 0& Y& d\end{array}\right]\left[\begin{array}{ccc}0& Y& d\\ X& 0& b\\ 0& 1& c\\ 1& 0& a\end{array}\right]\left[\begin{array}{ccc}1& 0& a\\ 0& 1& c\\ X& 0& b\\ 0& Y& d\end{array}\right]\left[\begin{array}{ccc}1& 0& a\\ 0& Y& d\\ 0& 1& c\\ X& 0& b\end{array}\right]\left[\begin{array}{ccc}1& 0& a\\ X& 0& b\\ 0& Y& d\\ 0& 1& c\end{array}\right]\right)$

$G2=\left(\left[\begin{array}{ccc}1& 0& a^{\&prime;}\\ 0& 1& b^{\&prime;}\\ X& 0& c^{\&prime;}\\ 0& Y& d^{\&prime;}\end{array}\right]\left[\begin{array}{ccc}0& 1& b^{\&prime;}\\ 1& 0& a^{\&prime;}\\ X& 0& c^{\&prime;}\\ 0& Y& d^{\&prime;}\end{array}\right]\left[\begin{array}{ccc}X& 0& c^{\&prime;}\\ 0& 1& b^{\&prime;}\\ 1& 0& a^{\&prime;}\\ 0& Y& d^{\&prime;}\end{array}\right]\left[\begin{array}{ccc}0& Y& d^{\&prime;}\\ 0& 1& b^{\&prime;}\\ X& 0& c^{\&prime;}\\ 1& 0& a^{\&prime;}\end{array}\right]\left[\begin{array}{ccc}1& 0& a^{\&prime;}\\ X& 0& c^{\&prime;}\\ 0& 1& b^{\&prime;}\\ 0& Y& d^{\&prime;}\end{array}\right]\left[\begin{array}{ccc}1& 0& a^{\&prime;}\\ 0& Y& d^{\&prime;}\\ X& 0& c^{\&prime;}\\ 0& 1& b^{\&prime;}\end{array}\right]\left[\begin{array}{ccc}1& 0& a^{\&prime;}\\ 0& 1& b^{\&prime;}\\ 0& Y& d^{\&prime;}\\ X& 0& c^{\&prime;}\end{array}\right]\right)$

$G3=\left(\left[\begin{array}{ccc}1& 0& a^{\&prime;\&prime;}\\ 0& 1& b^{\&prime;\&prime;}\\ 0& Y& c^{\&prime;\&prime;}\\ X& 0& d^{\&prime;\&prime;}\end{array}\right]\left[\begin{array}{ccc}0& 1& b^{\&prime;\&prime;}\\ 1& 0& a^{\&prime;\&prime;}\\ 0& Y& c^{\&prime;\&prime;}\\ X& 0& d^{\&prime;\&prime;}\end{array}\right]\left[\begin{array}{ccc}0& Y& c^{\&prime;\&prime;}\\ 0& 1& b^{\&prime;\&prime;}\\ 1& 0& a^{\&prime;\&prime;}\\ X& 0& d^{\&prime;\&prime;}\end{array}\right]\left[\begin{array}{ccc}X& 0& d^{\&prime;\&prime;}\\ 0& 1& b^{\&prime;\&prime;}\\ 0& Y& c^{\&prime;\&prime;}\\ 1& 0& a^{\&prime;\&prime;}\end{array}\right]\left[\begin{array}{ccc}1& 0& a^{\&prime;\&prime;}\\ 0& Y& c^{\&prime;\&prime;}\\ 0& 1& b^{\&prime;\&prime;}\\ X& 0& d^{\&prime;\&prime;}\end{array}\right]\left[\begin{array}{ccc}1& 0& a^{\&prime;\&prime;}\\ X& 0& d^{\&prime;\&prime;}\\ 0& Y& c^{\&prime;\&prime;}\\ 0& 1& b^{\&prime;\&prime;}\end{array}\right]\left[\begin{array}{ccc}1& 0& a^{\&prime;\&prime;}\\ 0& 1& b^{\&prime;\&prime;}\\ X& 0& d^{\&prime;\&prime;}\\ 0& Y& c^{\&prime;\&prime;}\end{array}\right]\right)$

$X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

[equation 51]

Column vector

Or their line replacement form can be different pre-coding matrixes, such as based on precoding vector/matrix of DFT or based on precoding vector/matrix of bold and unconstrained Si Huoerde.For example, the example of above column vector can be order-1 code book of 3GPP LTE system (distribution version 8 systems).

Be similar to the 4th embodiment, in the 6th embodiment, preferably the column vector of pre-coding matrix is orthogonal, and element a, and a ', or a " are set to 1.Example according to the code book of the 6th embodiment can be by following equation 52 expressions.

[equation 52]

${G1}^{\&prime;}=\left[\begin{array}{ccc}1& 0& 1\\ X& 0& -X\\ 0& 1& c\\ 0& Y& d\end{array}\right]\left[\begin{array}{ccc}X& 0& -X\\ 1& 0& 1\\ 0& 1& c\\ 0& Y& d\end{array}\right]\left[\begin{array}{ccc}0& 1& c\\ X& 0& -X\\ 1& 0& 1\\ 0& Y& d\end{array}\right]\left[\begin{array}{ccc}0& Y& d\\ X& 0& -X\\ 0& 1& c\\ 1& 0& 1\end{array}\right]\left[\begin{array}{ccc}1& 0& 1\\ 0& 1& c\\ X& 0& -X\\ 0& Y& d\end{array}\right]\left[\begin{array}{ccc}1& 0& 1\\ 0& Y& d\\ 0& 1& c\\ X& 0& -X\end{array}\right]$

$\left[\begin{array}{ccc}1& 0& 1\\ X& 0& -X\\ 0& Y& d\\ 0& 1& c\end{array}\right]$

${G2}^{\&prime;}=\left[\begin{array}{ccc}1& 0& 1\\ 0& 1& b^{\&prime;}\\ X& 0& -X\\ 0& Y& d^{\&prime;}\end{array}\right]\left[\begin{array}{ccc}0& 1& b^{\&prime;}\\ 1& 0& 1\\ X& 0& -X\\ 0& Y& d^{\&prime;}\end{array}\right]\left[\begin{array}{ccc}X& 0& -X\\ 0& 1& b^{\&prime;}\\ 1& 0& 1\\ 0& Y& d^{\&prime;}\end{array}\right]\left[\begin{array}{ccc}0& Y& d^{\&prime;}\\ 0& 1& b^{\&prime;}\\ X& 0& -X\\ 1& 0& 1\end{array}\right]\left[\begin{array}{ccc}1& 0& 1\\ X& 0& -X\\ 0& 1& b^{\&prime;}\\ 0& Y& d^{\&prime;}\end{array}\right]\left[\begin{array}{ccc}1& 0& 1\\ 0& Y& d^{\&prime;}\\ X& 0& -X\\ 0& 1& b^{\&prime;}\end{array}\right]$

$\left[\begin{array}{ccc}1& 0& 1\\ 0& 1& b^{\&prime;}\\ 0& Y& d^{\&prime;}\\ X& 0& -X\end{array}\right]$

${G3}^{\&prime;}=\left[\begin{array}{ccc}1& 0& 1\\ 0& 1& b^{\&prime;\&prime;}\\ 0& Y& c^{\&prime;\&prime;}\\ X& 0& -X\end{array}\right]\left[\begin{array}{ccc}0& 1& b^{\&prime;\&prime;}\\ 1& 0& 1\\ 0& Y& c^{\&prime;\&prime;}\\ X& 0& -X\end{array}\right]\left[\begin{array}{ccc}0& Y& c^{\&prime;\&prime;}\\ 0& 1& b^{\&prime;\&prime;}\\ 1& 0& 1\\ X& 0& -X\end{array}\right]\left[\begin{array}{ccc}X& 0& -X\\ 0& 1& b^{\&prime;\&prime;}\\ 0& Y& c^{\&prime;\&prime;}\\ 1& 0& 1\end{array}\right]\left[\begin{array}{ccc}1& 0& 1\\ 0& Y& c^{\&prime;\&prime;}\\ 0& 1& b^{\&prime;\&prime;}\\ X& 0& -X\end{array}\right]\left[\begin{array}{ccc}1& 0& 1\\ X& 0& -X\\ 0& Y& c^{\&prime;\&prime;}\\ 0& 1& b^{\&prime;\&prime;}\end{array}\right]$

$\left[\begin{array}{ccc}1& 0& 1\\ 0& 1& b^{\&prime;\&prime;}\\ X& 0& -X\\ 0& Y& c^{\&prime;\&prime;}\end{array}\right]$

Wherein, $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

Order 3-the 7th embodiment

Dispose code book with the form of the line replacement of the code book shown in the 5th embodiment according to the 7th embodiment.Example according to the code book of the 7th embodiment can be by following equation 53 expressions.

[equation 53]

Wherein, $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

Column vector

Or their line replacement form can be different pre-coding matrixes, such as based on precoding vector/matrix of DFT or based on precoding vector/matrix of bold and unconstrained Si Huoerde.For example, the example of above column vector can be order-1 code book of 3GPP LTE system (distribution version 8 systems).

Be similar to the 4th embodiment, in the 7th embodiment, preferably the column vector of pre-coding matrix is orthogonal, and element a, a ', or a " be set to 1.Preferably use the code book according to present embodiment when not carrying out the antenna displacement, this is because when using the code book of the 7th embodiment, can realize the antenna replacement result by the pre-coding matrix of carrying out line replacement.

Example according to the code book of the 7th embodiment can be by following equation 54 expressions.

[equation 54]

$G1=$

$G2=$

$G3=$

Wherein, $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}$

Be used to select the reference of other pre-coding matrix

Except norm 1 and norm 2, present embodiment is designed to consider another norm.In this norm, be not to be selected from eight values by the alphabetical represented element that is included in each pre-coding matrix group, but be limited to 1, j ,-1 and-j, thereby reduced the quantity that is included in the pre-coding matrix in the code book.

According to present embodiment, consider to comprise the code book collection of 16 pre-coding matrixes.For example, can followingly represent about the order 1DFT vector of 4Tx antenna.

N * N DFT matrix (or Fourier matrix) F based on given component (component) _N, such as being normalized to

F _N=e ^{-j2 π/N}, by following equation 55 expressions.

[equation 55]

$F_N=\left[\begin{array}{ccccc}1& 1& 1& \&CenterDot;\&CenterDot;\&CenterDot;& 1\\ 1& F_N^1& F_N^2& \&CenterDot;\&CenterDot;\&CenterDot;& F_N^{N-1}\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& & \&CenterDot;\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\&CenterDot;\&CenterDot;& \&CenterDot;\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& & \&CenterDot;\\ 1& F_N^{(N-1)}& F_N^{2\&CenterDot;(N-1)}& \&CenterDot;\&CenterDot;\&CenterDot;& F_N^{(N-1)\&CenterDot;(N-1)}\end{array}\right]$

Constitute about the order 1DFT vector of 4Tx antenna 16 column vectors by the initial four lines that is positioned at equation 55.

[table 8]

Next, 4Tx order 1 bold and unconstrained Si Huoerde vector (HH vector) can be by following table 9 expressions.

[table 9]

The codebook size restriction

In first to the 3rd norm (norm 1, norm 2 and norm 3) at least one can be used to limit the quantity that is included in the pre-coding matrix in the code book.In the present embodiment, will describe the codebook size restriction that is used for each order in detail, particularly, the restriction of the size of order 1 code book.

At present, the down link 4Tx code book that is used for 3GPP LTE system stipulates that each order has the vector/matrix of equal number (that is 16 vector/matrixes).Yet, it is well known in the art that from the quantity of the required pre-coding matrix of high order acquisition optimum performance to be less than the quantity that obtains the required pre-coding matrix of optimum performance from low-rank.For this purpose, this embodiment of the present invention has proposed new code book form, and wherein, the quantity of the pre-coding matrix of low-rank is higher than the quantity of the pre-coding matrix of high order, makes each order have the pre-coding matrix of varying number.

Simultaneously, mobile communication system can be supported multiple transmission mode.Suppose that X transmission mode can be used to be positioned at the UE of cell edge effectively, make UE can support to use the close loop maneuver of order 1 precoding matrix indicators (PMI).In this case, order 1PMI vector can be selected from order 1 pre-coding matrix that is included in the whole code book, this whole code book by support Y transmission mode (such as, open loop MIMO or closed-loop MIMO) a plurality of pre-coding matrixes formations of all orders.In this case, suppose that X transmission mode is different from Y transmission mode.For Y transmission mode, the size of order 1 code book does not need to be configured to two power.In addition, though order 1 codebook size is configured to two power, has only codebook size to increase, and do not have higher performance improvement.Therefore, this embodiment has proposed to limit reasoningly the method for codebook size when having proper property, makes to represent code book with the feedback information of less amount.

At first, suppose to support the quantity of pre-coding matrix of each order of Y transmission mode to be set to A-order 1, B-order 2, C-order 3 and D-order 4 (wherein, D≤C≤B≤A).In this case, the size of whole code book equals the summation of A, B, C and D.In order to support above codebook size, need be used to satisfy the m bit signalling of the following condition shown in the equation 56.

[equation 56]

A+B+C+D≤2 ^m

If UE is configured to use X transmission mode, then UE can use order 1PMI information.Preferably limit 2 again ⁿIndividual order 1PMI (wherein, n＜m), to reduce the desired bit number of signaling.Can use several different methods (1), (2), (3), (4), (5) and (6) to reduce the signaling bit number.

(1) method 1

If of course, select the even number index.

(2) method 2

If of course, select the odd number index.

(3) method 3

Select initial 2 ⁿIndividual index.

(4) method 4

Select last 2 ⁿIndividual index.

(5) method 5

Select index arbitrarily.

(6) method 6

Realize structure by signaling.

For example, for Y transmission mode,,,, and provide 4 pre-coding matrixes for order 4 for order 3 provides 15 pre-coding matrixes for order 2 provides 15 pre-coding matrixes for order 1 provides 33 pre-coding matrixes.

In this case, can use the several different methods (1), (2), (3), (4), (5) and (6) that are used to construct order 1 code book, this order 1 code book is used for only representing 16 pre-coding matrixes.

(1) method 1

If of course, select the even number index

(2) method 2

If of course, select the odd number index

(3) method 3

Select 16 initial index.

(4) method 4

Select 16 last index.

(5) method 5

Select index arbitrarily.

(6) method 6

Realize structure by signaling.

Simultaneously, can use the several different methods (1), (2), (3) and (4) that are used to construct order 1 code book, this order 1 code book is used for only representing 32 pre-coding matrixes.

(1) method 1

Select 32 initial index.

(2) method 2

Select 32 last index.

(3) method 3

Select index arbitrarily.

(4) method 4

Realize structure by signaling.

If 16 down link order 1 vectors are included in order 1 code book that includes 32 pre-coding matrixes, then can use following method for limiting (I) and (II).

Method for limiting (I) that the situation of order 1 code book that below will describe in detail and construct the 16-size is corresponding and detailed description thereof.

A) select 16 down link order 1 vectors.

B) select 16-size order 1 code book, and do not consider down link order 1 vector.

(1) selects 16 initial index.

(2) select 16 last index.

(3) select index arbitrarily.

(4) realize structure by signaling.

Another method for limiting (II) is corresponding to the another kind of situation of structure 32-size order 1 code book, and will describe its detailed description in detail following.

A) select 16 down link order 1 vector+other vectors.

(1) selects 16 initial index.

(2) select 16 last index.

(3) select index arbitrarily.

(4) realize structure by signaling.

B) select 32-size order 1 code book, and do not consider down link order 1 vector.

(1) selects 32 initial index.

(2) select 32 last index.

(3) select index arbitrarily.

(4) realize structure by signaling.

Can be configured to the quantity of the code book of each order according to such scheme effectively.

III. equipment disposition

The III chapter will be included in improvement structure among the UE in following discloses, wherein, improve structure and can keep good PAPR or CM characteristic, simultaneously MIMO scheme application first downlink signal be sent.

Figure 10 is the block diagram that general base station (BS) and general user's equipment (UE) are shown.

With reference to Figure 10, base station (BS) 10 comprises processor 11, memory 12 and radio frequency (RF) module 13.RF module 13 is used as the receiving uplink signal and sends the transmission/receiver module of down link signal.Processor 11 can use the down link signal that is stored in the memory 12 to send information (for example, being included in the specific pre-coding matrix of the code book that is used for downlink signal transmissions) and control downlink signal transmissions.Otherwise, reverse process as precoding processing, processor 11 can (for example receive information by the uplink signal that will be stored in the memory 12, uplink signal) conjugate matrices that multiply by same pre-coding matrix come control signal to receive and handle as the pre-coding matrix that uses in UE 20.

UE 20 can comprise processor 21, memory 22 and the RF module 23 that is used as transmission uplink signal and receiving downlink signal transmission module.Processor 21 can use the uplink signal that is stored in the memory 22 to send information (for example, being included in the specific pre-coding matrix of the above-mentioned code book that is used for the uplink signal transmission) and control the uplink signal transmission.Otherwise, reverse process as precoding processing, processor 21 can (for example receive information by the down link signal that will be stored in the memory 22, down link signal) conjugate matrices that multiply by same pre-coding matrix come control signal to receive and handle as the pre-coding matrix that uses among the UE 20.

Simultaneously, below will describe processor, and especially use the SC-FDMA scheme to send the detailed description of the structure of signal about UE 20 (or BS 10).Below use description to send the Signal Processing device and be used for sending the Signal Processing device based on the OFDM scheme of 3GPP LTE system based on the SC-FDMA scheme in the 3GPP LTE system, and below use description to make UE to use SC-FDMA scheme and MIMO scheme to send the processor of uplink signal.

Figure 11 and Figure 12 illustrate the SC-FDMA scheme and the OFDMA scheme that is used for sending in 3GPP LTE system down link signal that is used for sending in 3GPP LTE system uplink signal.

With reference to Figure 11, not only be used to send the UE of uplink signal, and the base station (BS) that is used to send down link signal includes: serial-parallel converter 401, subcarrier mapper 403, M point IDFT module 404, parallel-serial converter 405 etc.Yet the UE that uses the SC-FDMA scheme to send signal further comprises N point DFT module 402, and the IDFT processing influence of the predetermined portions of compensation M point IDFT module 404, makes that sending signal can have the single carrier feature.

Figure 12 is illustrated in the block diagram of the uplink signal processing of stipulating among the TS 36.211 that comprises 3GPP LTE system specifications and the relation between the use SC-FDMA scheme transmission Signal Processing device.According to TS 36.211, each UE uses specific scrambler sequence to carry out scrambler to sending signal, and with the transmission uplink signal, and the signal behind the scrambler is modulated, makes to generate complex symbol.After this, execution is carried out the conversion precoding of DFT spread processing to complex symbol.That is, the conversion precoder of regulation can be corresponding to N point DFT module in TS 36.211.After this, by the resource element mapper, according to the mapping ruler based on Resource Block (RB), the DFT spread-spectrum signal can be mapped to the specific resources element, and can recognize, this is operated corresponding to the subcarrier mapper shown in Figure 11.By the SC-FDMA signal generator signal that maps to resource element is carried out M point IDFT or IFFT processing, IDFT or IFFT result are carried out also-the string conversion, then Cyclic Prefix (CP) is added into the P/S transformation result.

Simultaneously, Figure 12 further shows the processor of base station (BS), and this base station is used for receiving the signal that has received in the base station by above-mentioned processing.

Like this, the processor that is used for carrying out in 3GPP LTE system SC-FDMA transmission does not comprise the structure of utilizing the MIMO scheme.Thereby, at first will be described in the BS processor that carries out the MIMO transmission in the 3GPP LTE system, and will describe then by using above BS processor to send the processor of uplink signal in conjunction with SC-FDMA scheme and MIMO scheme.

Figure 13 illustrates to make base station (BS) use the MIMO scheme to send the block diagram of the processor of down link signal in 3GPP LTE system.

Base station (BS) in the 3GPP LTE system can send one or more code words via down link.Thereby these one or more code words can be treated to complex symbol by scrambler module 301 and modulation mapper 302 in the mode identical with the uplink operation shown in Figure 12.After this, complex symbol is mapped to a plurality of layer by layer mapper 303, and each layer multiply by the predetermined pre-coding matrix of selecting according to channel status, is assigned to each transmitting antenna by precoding module 304 then.Transmission signal after the processing of each antenna is mapped to the time-frequency resources element that will send in data by resource element mapper 305.After this, after passing through OFDMA signal generator 306, the result of mapping can send via each antenna.

Yet, if in 3GPP LTE system, use the down link signal scheme shown in Figure 13, PAPR or CM characteristic degradation.Therefore, UE must be combined in the SC-FDMA scheme of good PAPR of the maintenance of describing among Figure 11 and Figure 12 and CM performance and the MIMO scheme shown in Figure 13 effectively, and must construct and use the pre-coding matrix can remain on the good PAPR that describes among the above embodiment and CM characteristic to carry out the UE of precoding.

According to one embodiment of present invention, suppose to comprise a plurality of antenna (not shown) that are used to send with received signal via the UE that a plurality of antennas (many antennas) send uplink signal.With reference to Figure 10, UE 20 comprises: be used to store the memory 22 of code book and be connected to a plurality of antenna (not shown) and memory 22 to handle the processor 21 of uplink signal transmission.In this case, be stored in code book in the memory 22 comprise with single layer signal be sent in a plurality of antennas each mode and the pre-coding matrix set up.Below will describe the processor 21 of the UE of above-mentioned configuration in detail.

Figure 14 illustrates processor according to an embodiment of the invention.

With reference to Figure 14, the processor of UE 20 comprises according to an embodiment of the invention: code word is used for uplink signal is mapped to the layer of the predetermined quantity corresponding with specific order to layer mapper 1401; The DFT module 1402 of predetermined quantity is used for each execution discrete Fourier transform (DFT) (DFT) spread spectrum to the layer signal of predetermined quantity; And precoder 1043.Precoder 1043 is selected to be sent to the mode of each antenna 1405 and the specific pre-coding matrix set up with a layer signal, so that the resulting layer signal of DFT spread spectrum that receives from DFT module 1402 is carried out precoding.Especially, in this embodiment of the present invention, each DFT module 1402 is carried out the spread spectrum of each layer signal, is used for this DFT module 1402 that each layer signal carries out spread spectrum just in time is positioned at before the precoder 1043.When precoder 1043 is carried out precoding, precoder 1403 is configured to make each layer signal to be mapped to an antenna, send via the antenna that is shone upon then,, and keep good PAPR and CM characteristic so that keep the single carrier feature of each layer signal.Simultaneously, UE 20 further comprises sending module.Sending module is carried out the processing based on precoded signal structure SC-FDMA symbol, and via a plurality of antennas 1405 resulting precoded signal is sent to base station (BS).

Simultaneously, select to be used for the pre-coding matrix of signal transmission in the code book of precoder 1403 from be stored in memory 22, and selected pre-coding matrix is carried out precoding.Preferably, these pre-coding matrixes can be the pre-coding matrixes that is established for the transmitted power of the transmitted power of balanced a plurality of antennas and/or each layer.

The quantity of a plurality of antennas 1045 can be 2 or 4.The processor of UE can further not only be carried out the layer translation function that is used for periodically or changes the layer that maps to certain code word aperiodically according to an embodiment of the invention, and carries out the antenna translation function that is used for periodically or changes the antenna that sends the certain layer signal aperiodically.Layer translation function can be carried out by layer mapper 1401 separately with the precoding of precoder 1403, carries out by the column permutation of pre-coding matrix in the time of perhaps can also working as precoder 1403 execution precodings.In addition, the antenna translation function can also be carried out separately with the precoding of precoder 1403, perhaps can also carry out by the line replacement of pre-coding matrix.

Exemplary embodiments described above is element of the present invention and combination of features.Unless otherwise mentioned, otherwise element or feature can be considered to optional.Not with the situation of other elements or characteristics combination under, can realize each element or feature.And embodiments of the invention can be constructed by built-up section element and/or feature.The operating sequence of Miao Shuing can rearrange in an embodiment of the present invention.Some structures or the feature of any one embodiment can comprise in another embodiment, and can replace with corresponding construction or the feature of another embodiment.Significantly, the present invention can be the combination that does not have the claim of specific reference relation in claims by specific implementation, perhaps can comprise the new claim of revising after submitting to.

Embodiments of the invention can realize by multiple device, for example, and hardware, firmware, software or its combination.In hardware configuration, embodiments of the invention can be by realizations such as one or more application-specific integrated circuit (ASIC)s (ASIC), digital signal processor (DSP), digital signal processing appts (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessors.

In firmware or software arrangements, realizations such as the module that embodiments of the invention can be by carrying out above-mentioned functions or operation, process, function.Software code can be stored in the memory cell and by processor and drive.Memory cell can be positioned at the inside or the outside of processor, and can data is sent to processor and receive data from processor via multiple known devices.

It is evident that for those skilled in the art, under the situation that does not break away from the spirit or scope of the present invention, can make multiple modification and change in the present invention.Thereby foregoing detailed description should be considered to only be used for illustration purpose rather than restriction purpose.Scope of the present invention must be decided by the reasonable analysis of claim, and all comprises within the scope of the invention at all modifications of equivalent scope of the present invention.Apparently, the present invention can be the combination that does not have the claim of specific reference relation in claims by specific implementation, perhaps can comprise the new claim of application submission back modification.

Can find out obviously that from the above description the present invention can keep PAPR or CM characteristic when using the MIMO scheme to send uplink signal.

In addition, the present invention as one man controls or regulates antenna/layer transmitted power, minimizes the required signaling consumption of pre-coding matrix information, and obtains maximum diversity gain.

The present invention can be applicable to wideband wireless mobile communication system.

It will be obvious to those skilled in the art that and under the situation that does not break away from the spirit or scope of the present invention, to make multiple modification and change in the present invention.Therefore, this invention is intended to cover modification of the present invention and change, as long as they fall in the scope of claims and equivalent thereof.

Claims (18)

1. one kind is used to control the method for subscriber equipment (UE) via a plurality of antenna transmission uplink signals, and described method comprises:

Described uplink signal is mapped to the layer of predetermined quantity;

To each execution discrete Fourier transform (DFT) (DFT) spread spectrum in the layer signal of predetermined quantity;

By using specific pre-coding matrix to come each DFT spread spectrum layer signal is carried out precoding, described specific pre-coding matrix is set up in the mode that sends a layer signal via in a plurality of antennas each, and described a plurality of antennas are selected from the code book of pre-stored; And

Be used to construct the predetermined process that single carrier-frequency division multiple access inserts (SC-FDMA) symbol by the signal of precoding is carried out, the signal of described precoding be sent to base station (BS) via described a plurality of antennas.

2. method according to claim 1, wherein, described specific pre-coding matrix is the pre-coding matrix of setting up in the mode of the transmitted power that has homogeneous between described a plurality of antennas.

3. method according to claim 1, wherein, described specific pre-coding matrix is to have the mode of transmitted power of homogeneous between the layer with described predetermined quantity and the pre-coding matrix set up.

4. method according to claim 1, wherein, described code book comprises that the quantity when described a plurality of antennas is 4 and order 2 pre-coding matrixes that utilized when being set to 2 of order value, wherein, described order 2 pre-coding matrixes comprise and being configured to

Form and satisfy condition into

First kind pre-coding matrix (here, each row of described pre-coding matrix corresponds respectively to four antennas in described a plurality of antenna, and each row corresponds respectively to layer).

5. method according to claim 4, wherein, described order 2 pre-coding matrixes further comprise: be configured to

The second type pre-coding matrix of form, and be configured to

The 3rd type pre-coding matrix of form, here, described second type pre-coding matrix and described the 3rd type pre-coding matrix satisfy condition $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}.$

6. method according to claim 5, wherein, described order 2 pre-coding matrixes further comprise: the pre-coding matrix that generated when position change of each row of described first to the 3rd type pre-coding matrix, the pre-coding matrix that generated when position changes of each row of described first to the 3rd type pre-coding matrix, and one or more in the pre-coding matrix that when the position change of each row of described first to the 3rd type pre-coding matrix and each row, is generated.

7. method according to claim 1, wherein, described code book comprises that the quantity when described a plurality of antennas is 4 and order 3 pre-coding matrixes that utilized when being set to 3 of order value, wherein, described order 3 pre-coding matrixes comprise and being configured to

Form and satisfying condition

First kind pre-coding matrix (here, each row of described pre-coding matrix corresponds respectively to four antennas in described a plurality of antenna, and each row corresponds respectively to layer).

8. method according to claim 7, wherein, described order 3 pre-coding matrixes further comprise and being configured to

The second type pre-coding matrix of form, and be configured to

The 3rd type pre-coding matrix of form, here, each in described second type pre-coding matrix and the 3rd type pre-coding matrix all satisfies condition $Y,Z\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}.$

9. method according to claim 8, wherein, described order 3 pre-coding matrixes further comprise: the pre-coding matrix that generated when position change of each row of described first to the 3rd type pre-coding matrix, the pre-coding matrix that generated when position changes of each row of described first to the 3rd type pre-coding matrix, and one or more in the pre-coding matrix that when the position change of each row of described first to the 3rd type pre-coding matrix and each row, is generated.

10. method according to claim 1, wherein, described code book comprises: when the quantity of described a plurality of antennas is 4 and order 3 pre-coding matrixes that utilized when being set to 3 of order value, described order 3 pre-coding matrixes comprise and are configured to ground floor is mapped to first antenna and second antenna, replacedly, and with the second layer and the 3rd layer of pre-coding matrix that maps to third antenna and the 4th antenna respectively.

11. method according to claim 1, wherein, described code book comprises the pre-coding matrix of the varying number that is used for each order.

12. method according to claim 1 wherein, is that each described uplink signal is imported in the unit with the code word, and

The step that described uplink signal is mapped to the layer of predetermined quantity comprises: the layer periodic variation that certain code word is mapped to is another layer.

13. method according to claim 12, wherein, the step that described uplink signal is mapped to the layer of predetermined quantity comprises: the layer that every SC-FDMA symbol is mapped to certain code word is changed into another layer.

14. the subscriber equipment via a plurality of antenna transmission uplink signals (UE) comprising:

A plurality of antennas are used for sending and received signal;

Memory is used to store the code book with pre-coding matrix, and described pre-coding matrix is set up in each the mode that a layer signal is sent in described a plurality of antenna; And

Processor is connected to described a plurality of antenna and described memory, with the transmission of processing uplink signal,

Wherein, described processor comprises:

The layer mapper, be used for described uplink signal map to the predetermined quantity corresponding with specific order the layer;

Discrete Fourier transform (DFT) (DFT) module is used for each the execution DFT spread spectrum to the layer signal of predetermined quantity;

Precoder, be used for by selecting specific pre-coding matrix to come each the DFT spread spectrum layer signal that receives from described DFT module is carried out precoding from the code book that is stored in described memory, described specific pre-coding matrix is set up in each the mode that a layer signal is sent in described a plurality of antenna; And

Sending module is used for the signal of precoding is carried out the predetermined process that is used to construct single carrier-frequency division multiple access (SC-FDMA) symbol, and the signal after will handling via described a plurality of antennas is sent to base station (BS).

15. subscriber equipment according to claim 14 (UE), wherein, be stored in code book in the described memory and comprise that quantity when described a plurality of antennas is 4 and order 2 pre-coding matrixes that utilized when being set to 2 of order, wherein, described order 2 pre-coding matrixes comprise and being configured to

Form and satisfying condition

First kind pre-coding matrix (here, each row of described pre-coding matrix corresponds respectively to four antennas in described a plurality of antenna, and each row corresponds respectively to layer).

16. subscriber equipment according to claim 15 (UE), wherein, described order 2 pre-coding matrixes further comprise: be configured to

The second type pre-coding matrix of form, and be configured to

The 3rd type pre-coding matrix of form, wherein, each in described second type pre-coding matrix and described the 3rd type pre-coding matrix all satisfies condition $X,Y\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}.$

17. subscriber equipment according to claim 14 (UE) wherein, is stored in described

One type pre-coding matrix (here, each row of described pre-coding matrix corresponds respectively to four antennas in described a plurality of antenna, and each row corresponds respectively to layer).

18. subscriber equipment according to claim 17 (UE), wherein, described order 3 pre-coding matrixes further comprise: be configured to

The second type pre-coding matrix of form, and be configured to

The 3rd type pre-coding matrix of form, wherein, each in described second type pre-coding matrix and described the 3rd type pre-coding matrix all satisfies condition $Y,Z\&Element;\{1,\frac{1+j}{\sqrt{2}},j,\frac{1-j}{\sqrt{2}},-1,\frac{-1-j}{\sqrt{2}},-j,\frac{-1+j}{\sqrt{2}}\}.$

Images