CN103457898A - Setting method for wireless communication system and setting device - Google Patents

Abstract

A setting method, for determining a first amount of a plurality of high-throughput long training fields within a packet in a wireless communication system, includes determining a second amount of a plurality of space time streams needed by the wireless communication system transmitting the packet, and setting the first amount to be greater than or equal to 8 when the second amount is greater than 4. The invention further provides a setting device.

Description

Establishing method and setting device for wireless communication system

Technical field

The present invention relates to a kind of establishing method for wireless communication system and setting device, relate in particular to a kind of establishing method and setting device of guaranteeing the WLAN (wireless local area network) passage estimation running of ultra-high throughput.

Background technology

WLAN (wireless local area network) (Wireless Local Area Network, WLAN) technology is one of popular wireless communication technology, the earliest for military use, be widely used in recent years various consumption electronic products, as desktop PC, mobile computer or personal digital assistant, provide masses the more convenient the Internet communication function fast that reaches.International (the Institute of Electrical and Electronics Engineers of the Institute of Electrical and Electronics Engineers (IEEE) of wireless LAN communication consensus standard IEEE802.11 series Shi You, IEEE) formulate, by early stage IEEE802.11a, IEEE802.11b, IEEE802.11g etc., evolution is to the IEEE802.11n of current main flow.The IEEE802.11a/g/n standard all adopts OFDM (Orthogonal Frequency-Division Multiplexing, OFDM) modulation technique, different from the IEEE802.11a/g standard is, the IEEE802.11n standard is used multiple-input and multiple-output (Multiple Input Multiple Output, MIMO) technology and other new function, significantly improved data rate and throughput of transmissions (Throughput), simultaneously, Channel Bandwidth increases to 40MHz by 20MHz.

Please refer to Fig. 1, the packet format schematic diagram that Fig. 1 is known IEEE802.11n standard.As shown in Figure 1, the grouping of IEEE802.11n standard is combined by an advance data (Preamble) and data waiting for transmission, and advance data is positioned at each grouping foremost, continues as data waiting for transmission.In addition, advance data is mixed format, can be compatible to the Wireless LAN device of IEEE802.11a/g standard downwards, the field comprised is sequentially traditional Short Training field L-STF(Legacy Short Training Field), the long training of tradition field L-LTF(Legacy Long Training Field), classical signal field L-SIG(Legacy Signal Field), high-throughput signal field HT-SIG(High-Throughput Signal Field), high-throughput Short Training field HT-STF(High-Throughput Short Training Field) and the long training of N high-throughput field HT-LTF(High-Throughput Long Training Field).Tradition Short Training field L-STF controls (Automatic Gain Control, AGC), initial frequency drift estimation (Frequency Offset Estimation) and initial time synchronous (Time Synchronization) for the initial detection (Start-of-packet Detection) of dividing into groups, automatic gain; L-LTF is synchronous for accurate Frequency offset estimation and time for the long training of tradition field; Classical signal field L-SIG carries the information of data rate and block length.The information that high-throughput signal field HT-SIG carries data rate, and belong to mixed format or conventional form for automatically detecting grouping; High-throughput Short Training field HT-STF controls for automatic gain; And the long training of high-throughput field HT-LTF makes receiving terminal can judge according to this channel status for the passage estimation of multiple-input and multiple-output.

The pattern (Pattern) of the long training of high-throughput field HT-LTF is known by industry, be not repeated herein, and, according to its function, the long training of high-throughput field HT-LTF can be further divided into two classes.The first kind is the long training of data high-throughput field, the state of the passage that is used for estimating that current (data) are used, its quantity N _dLTFquantity N by space time bundle (Space Time Stream) _sTSthe institute determine, as shown in Figure 2.Equations of The Second Kind, for extending the long training of (Extension) high-throughput field, is used for detecting the exceptional space dimension (Spatial Dimension) of untapped passage, its quantity N _eLTFquantity N by exceptional space dimension to be detected _eSSinstitute determines, and both sides relation is same as the quantity N shown in Fig. 2 _dLTFwith quantity N _sTSrelation.In addition, because the IEEE802.11n standard is supported four antennas at the most, therefore, N _dLTF, N _eLTFall be less than or equal to 4.

On the other hand, the complexity of estimating in order to reduce passage, known technology is that the long training of high-throughput field HT-LTF is designed to given different weights and delay and produced by single symbol (Symbol).Therefore, as shown in Figure 3, for different transmission path (TX1～TX4), transmission ends can, by the long training of high-throughput field HT-LTF first through an extending codes (Spreading Code) matrix, determine weight suitable when passage is estimated; Then through cyclic-shifted delay (Cyclic Shift Delay, CSD), process, add Cyclic Prefix (Cyclic Prefix), with opposing multi-path transmission passage interference; Then pass through spatial mappings (Spatial Mapping) and process, as wave beam forms (Beamforming), in order to promote signal to noise ratio; Finally, through reverse discrete fourier conversion (Inverse Discrete Fourier Transform), realize OFDM modulation, frequency domain (Frequency Domain) list entries is converted to time domain (Time Domain) OFDM modulation symbol (OFDM Symbol) sequence.Wherein, the extending codes matrix is one 4 * 4 matrix P _{4 * 4}, detailed content is:

${\mathrm{<figure-callout\; id="4"\; label="P"\; filenames="HDA00003628450700021.png"\; state="\{\{state\}\}">P</figure-callout>}}_{4\&times;4}=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right].$

In order to realize more high-quality WLAN (wireless local area network) transmission, relevant unit is formulating WLAN standard of new generation, as IEEE802.11ac, it has ultra-high throughput (Very High Throughput, VHT), and Channel Bandwidth is increased to 80MHz by 40MHz, can support the antenna more than four.In other words, the quantity N of space time bundle _sTS(or the quantity N of exceptional space dimension to be detected _eSS) may surpass 4, exceeded the defined situation of Fig. 2, and can't the long quantity N that trains field of determination data high-throughput _dLTF(or extend the long quantity N that trains field of high-throughput _eLTF), also can't determine the extending codes matrix simultaneously.

In view of this, be necessary in fact to determine the quantity N when the space time bundle _sTS(or the quantity N of exceptional space dimension to be detected _eSS) be greater than at 4 o'clock, the quantity N of the long training of data high-throughput field _dLTF(or extend the long quantity N that trains field of high-throughput _eLTF), in order to the realization of WLAN standard of new generation.

Summary of the invention

Therefore, main purpose of the present invention is to be provided for establishing method and the setting device of wireless communication system.

The present invention discloses a kind of establishing method, determines one first quantity of the long training of a plurality of extension high-throughputs field that a grouping comprises for a wireless communication system.This establishing method includes: judge that this wireless communication system transmits one second quantity of these required a plurality of space time bundles that divide into groups; And be greater than at 4 o'clock in this second quantity, this first quantity is set as being more than or equal to 8.

The present invention separately discloses a kind of setting device, determines one first quantity of the long training of a plurality of extension high-throughputs field that a grouping comprises for a wireless communication system.This setting device includes: judge module, transmit one second quantity of these required a plurality of space time bundles that divide into groups for judging this wireless communication system; And setting module, in this second quantity, being greater than at 4 o'clock, this first quantity is set as being more than or equal to 8.

The present invention also discloses a kind of establishing method, for a wireless communication system, determines a plurality of data high-throughputs long training field that a grouping comprises or one first quantity of extending the long training of high-throughput field.This establishing method includes: judge that this wireless communication system transmits one second quantity of these required a plurality of space time bundles that divide into groups; And be greater than 4 different value at least two in this second quantity, this first quantity is set as equaling 8.

The present invention discloses a kind of setting device again, for a wireless communication system, determines a plurality of data high-throughputs long training field that a grouping comprises or one first quantity of extending the long training of high-throughput field.This setting device includes: judge module, transmit one second quantity of these required a plurality of space time bundles that divide into groups for judging this wireless communication system; And setting module, be greater than at 4 o'clock in this second quantity, thering are at least two different values, this first quantity is set as equaling 8.

The present invention is in the quantity N of space time bundle _sTSbe greater than at 4 o'clock, by the quantity N of data high-throughput long training field or the long training of extension high-throughput field _dLTFbe set as more than 8, or more accurately, as the quantity N of space time bundle _sTSequal at 5,6,7,8 o'clock, by the quantity N of data high-throughput long training field or the long training of extension high-throughput field _dLTFbe set as 8; Thus, can further determine the extending codes matrix, thereby guarantee the passage estimation running of the WLAN (wireless local area network) of ultra-high throughput.

The accompanying drawing explanation

The packet format schematic diagram that Fig. 1 is known IEEE802.11n standard.

The quantity schematic diagram of the long training of the high-throughput that Fig. 2 is known IEEE802.11n standard field.

The handling process schematic diagram that Fig. 3 is the long training of known IEEE802.11n standard high-throughput field.

The schematic diagram that Fig. 4 is the embodiment of the present invention one setting process.

The quantity schematic diagram of the long training of the high-throughput that Fig. 5 is embodiment of the present invention field.

The passage estimated result schematic diagram that Fig. 6 is the embodiment of the present invention.

[main element symbol description]

L-STF tradition Short Training field

The long training of L-LTF tradition field

L-SIG classical signal field

The signal field of HT-SIG high-throughput

The Short Training field of HT-STF high-throughput

The long training field of HT-LTF high-throughput

N _sTSthe quantity of space time bundle

N _dLTFthe quantity of the long training of data high-throughput field

TX1～TX4 transmission path

40 setting process

400,402,404,406 steps

The MSE mean square error

The SNR signal to noise ratio

Embodiment

Please refer to Fig. 4, the schematic diagram that Fig. 4 is the embodiment of the present invention one setting process 40.Setting process 40 determines the quantity of the long training of the high-throughput field that a grouping comprises for a wireless communication system, this wireless communication system preferably meets WLAN standard IEEE802.11.Setting process 40 comprises following steps:

Step 400: start.

Step 402: the judgement wireless communication system transmits the quantity N of the required space time bundle of a grouping _sTS.

Step 404: in quantity N _sTSbe greater than at 4 o'clock, the quantity of the long training of the high-throughput that this grouping is comprised field is set as being more than or equal to 8.

Step 406: finish.

According to setting process 40, as the quantity N of space time bundle _sTSbe greater than at 4 o'clock, the present invention is set as the quantity of the long training of high-throughput field more than 8.In more detail, the field of the long training of alleged high-throughput herein is the long training of data high-throughput field, and in other words, aforementioned relation can following formula mean:

N _DLTF≥8, ${\&ForAll;N}_{\mathrm{STS}}>4.$

Quantity N when the long training of data high-throughput field _dLTFafter decision, can further determine the extending codes matrix, suitable weight when determining that passage is estimated.Should be noted, the extending codes matrix is used for changing the long training of high-throughput field, and the weight while estimating to set passage, therefore its detailed content may be different because of system requirements.Generally speaking, for reducing computational complexity, can preferably each element (element) of extending codes matrix be made as to 1 or-1, and be to equate with inverse matrix by extending codes transpose of a matrix matrix design; Thus, as long as the ranks of extending codes matrix are exchanged and get final product to obtain its inverse matrix, the integral operation complexity is minimized.By this, can pass through the powerful operational capability of computer system, draw the result of above-listed formula.

Further, quantity N in Fig. 2 _dLTFwith quantity N _sTSrelation extendible be the example of Fig. 5, that is as the quantity N of space time bundle _sTSbe 5,6,7,8 o'clock, the quantity N of the long training of data high-throughput field _dLTFbe all 8.In addition, take the technology continuity into account, in design, be applicable to N _dLTFduring>=8 extending codes matrix, can utilize and be applicable to N originally _dLTF=4 extending codes matrix P _{4 * 4}.For example:

${\mathrm{Pa}}_{8\&times;8}=\left[\begin{array}{cccccccc}1& -1& 1& 1& 1& -1& 1& 1\\ 1& 1& -1& 1& 1& 1& -1& 1\\ 1& 1& 1& -1& 1& 1& 1& -1\\ -1& 1& 1& 1& -1& 1& 1& 1\\ 1& 1& 1& 1& -1& -1& -1& -1\\ 1& -1& 1& -1& -1& 1& -1& 1\\ 1& 1& -1& -1& -1& -1& 1& 1\\ -1& -1& -1& 1& -1& 1& 1& -1\end{array}\right].$

If by extending codes matrix Pa _{8 * 8}be divided into four 4 * 4 matrixes, as $\left[\begin{array}{cc}{P}_{11}& P_{12}\\ P_{21}& P_{22}\end{array}\right],$ Known its upper left 4 * 4 matrixes (P11), upper right 4 * 4 matrixes (P12) are all extending codes matrix P _{4 * 4}.Further, can the unit of classifying as, matrix lower-left 4 * 4 matrixes (P21) and bottom right 4 * 4 matrixes (P22) are carried out to linear operation, can obtain:

${\mathrm{Pb}}_{8\&times;8}=\left[\begin{array}{cccccccc}1& -1& 1& 1& 1& -1& 1& 1\\ 1& 1& -1& 1& 1& 1& -1& 1\\ 1& 1& 1& -1& 1& 1& 1& -1\\ -1& 1& 1& 1& -1& 1& 1& 1\\ 1& -1& 1& 1& -1& 1& -1& -1\\ 1& 1& -1& 1& -1& -1& 1& -1\\ 1& 1& 1& -1& -1& -1& -1& 1\\ -1& 1& 1& 1& 1& -1& -1& -1\end{array}\right];$

Wherein, extending codes matrix Pb _{8 * 8}upper left 4 * 4 matrixes, upper right 4 * 4 matrixes and lower-left 4 * 4 matrixes be all extending codes matrix P _{4 * 4}.

Should be noted extending codes matrix Pa _{8 * 8}, Pb _{8 * 8}be two kinds of embodiment of 8 * 8 extending codes matrixes, so not as limit.Simultaneously, spirit of the present invention is to determine the quantity of the long training of high-throughput field.After the quantity of the long training of high-throughput field determines, the dimension of corresponding extending codes matrix can be determined, those skilled in the art can further comply with different demands, draw suitable extending codes matrix.

In order to verify preceding method, can draw simulation result as shown in Figure 6 by suitable emulation mode, send the passage estimated result of 2 receipts systems in order to mean 1.Wherein, the x axle means signal to noise ratio (Signal to Noise Ratio) SNR, and the y axle means mean square error MSE(Mean Square Error).

The present invention is in the quantity N of space time bundle _sTSbe greater than at 4 o'clock, by the quantity N of the long training of data high-throughput field _dLTFbe set as more than 8, it can derive as " as the quantity N of exceptional space dimension to be detected _eSSbe greater than at 4 o'clock, will extend the quantity N of the long training of high-throughput field _eLTFbe set as more than 8 ", this kind derivative should be those skilled in the art and can complete easily.

On the other hand, aspect hardware realizes, can software, the mode such as firmware, setting process 40 is converted to a program, and is stored in a memory of radio communication device, to indicate the step of micro-processing execution setting process 40.These are converted to proper procedure to realize corresponding setting device by setting process 40, should be the technology that those skilled in the art have the knack of.

As previously mentioned, known technology has only defined the quantity N of space time bundle _sTS(or the quantity N of exceptional space dimension to be detected _eSS) be less than or equal to the quantity N of the long training of 4 o'clock data high-throughputs field _dLTF(or extend the long quantity N that trains field of high-throughput _eLTF).Therefore, as the quantity N of space time bundle _sTSbe greater than at 4 o'clock, known technology can't determine the quantity of the long training of high-throughput field, also can't the extending codes matrix.In comparison, the present invention is in the quantity N of space time bundle _sTSbe greater than at 4 o'clock, by the quantity N of the long training of data high-throughput field _dLTFbe set as more than 8, or more accurately, as the quantity N of space time bundle _sTSequal at 5,6,7,8 o'clock, by the quantity N of the long training of data high-throughput field _dLTFbe set as 8; Thus, can further determine the extending codes matrix.

In sum, the present invention is greater than at 4 o'clock in the quantity of space time bundle, and the quantity of the long training of data high-throughput field is set as more than 8, with the passage of the WLAN (wireless local area network) of guaranteeing ultra-high throughput, estimates running.

The foregoing is only the preferred embodiments of the present invention, all equalizations of doing according to the claims in the present invention book change and modify, and all should belong to covering scope of the present invention.

Claims (10)

1. an establishing method, determine for a wireless communication system long one first quantity of training field of a plurality of extension high-throughputs that a grouping comprises, and this establishing method includes:

Judge that this wireless communication system transmits one second quantity of these required a plurality of space time bundles that divide into groups; And

Be greater than at 4 o'clock in this second quantity, this first quantity is set as being more than or equal to 8.

2. establishing method as claimed in claim 1, it is characterized in that, in this second quantity, be greater than at 4 o'clock, this first quantity is set as being more than or equal to 8 step, include when this second quantity equals at least arbitrary integer in 5,6,7,8, this first quantity is set as to 8.

3. establishing method as claimed in claim 2, it also comprises sets this wireless communication system and is used for changing one of the long training of the plurality of extension high-throughput field extending codes matrix P and is:

$P=\left[\begin{array}{cc}P11& P12\\ P21& P22\end{array}\right];$

Wherein, P11, P12, P21 and P22 are respectively one 4 * 4 matrixes.

4. establishing method as claimed in claim 3, is characterized in that, P11 is less than or equal at 4 o'clock for this second quantity, and this wireless communication system is used for changing an extending codes matrix of the long training of the plurality of extension high-throughput field.

5. establishing method as claimed in claim 4, is characterized in that,

$P11=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$

$P12=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$

$P21=\left[\begin{array}{cccc}1& 1& 1& 1\\ 1& -1& 1& -1\\ 1& 1& -1& -1\\ -1& -1& -1& 1\end{array}\right];$ And

$P22=\left[\begin{array}{cccc}-1& -1& -1& -1\\ -1& 1& -1& 1\\ -1& -1& 1& 1\\ -1& 1& 1& -1\end{array}\right].$

6. establishing method as claimed in claim 4, is characterized in that,

$P11=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$

$P12=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$

$P21=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$ And

$P22=\left[\begin{array}{cccc}-1& 1& -1& -1\\ -1& -1& 1& -1\\ -1& -1& -1& 1\\ 1& -1& -1& -1\end{array}\right].$

7. establishing method as claimed in claim 6, is characterized in that, P21 and P22 can, simultaneously with the unit of classifying as, carry out linear operation.

8. a setting device, determine for a wireless communication system long one first quantity of training field of a plurality of extension high-throughputs that a grouping comprises, and this setting device includes:

Judge module, transmit one second quantity of these required a plurality of space time bundles that divide into groups for judging this wireless communication system; And

Setting module, in this second quantity, being greater than at 4 o'clock, be set as being more than or equal to 8 by this first quantity.

9. an establishing method, determine a plurality of data high-throughputs long training field that a grouping comprises or one first quantity of extending the long training of high-throughput field for a wireless communication system, and this establishing method includes:

Judge that this wireless communication system transmits one second quantity of these required a plurality of space time bundles that divide into groups; And

Be greater than 4 different value at least two in this second quantity, this first quantity is set as equaling 8.

10. a setting device, determine a plurality of data high-throughputs long training field that a grouping comprises or one first quantity of extending the long training of high-throughput field for a wireless communication system, and this setting device includes:

Judge module, transmit one second quantity of these required a plurality of space time bundles that divide into groups for judging this wireless communication system; And

Setting module, be greater than at 4 o'clock in this second quantity, having at least two different values, and this first quantity is set as equaling 8.

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