CN101841506A - Multi-antenna wireless communication system and transmitting method thereof - Google Patents
Multi-antenna wireless communication system and transmitting method thereof Download PDFInfo
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Abstract
The invention discloses a multi-antenna wireless communication system and a transmitting method thereof. The method comprises the following steps of: dividing a plurality of antennae into two transmitting antenna groups; transmitting reference signals and data signals of the first transmitting antenna group in a mode that time frequencies of reference signals of transmitting antennae in the first transmitting antenna group are not superposed; and transmitting reference signals of the second transmitting antenna group in a mode that reference signals of the second transmitting antenna group are superposed on the transmitting signals of the first transmitting antenna group.
Description
Technical field
Present invention relates in general to the communications field, more specifically, the present invention relates to a kind of multi-aerial radio communication system and sending method thereof with a plurality of antennas.
Background technology
Based on OFDM (Orthogonal Frequency Division Multiplexing, OFDM) multi-carrier wireless communication of technology is divided into the broad-band channel of frequency selective fading the channel of a plurality of frequency-flat declines equably, making only needs the frequency equalizer of single tap at receiving terminal, thereby has greatly simplified the equalization algorithm of system receiver.
On the other hand, in order to improve the efficiency of transmission of wireless communication system, pilosity send-receives that (MultipleInput Multiple Output, MIMO) antenna technology has become the inevitable choice of current and following radio communication.In the MIMO-OFDM system, because the use of a plurality of sending-receiving antennas has improved the quantity of the unknown parameter of system greatly, these unknown parameters all need to use known pilot tone or training signal (being also referred to as reference signal hereinafter) to estimate to obtain, and extra pilot frequency sequence can take a large amount of physical resources, thereby the use of many antennas has proposed very big challenge to the estimation of these unknown parameters.
For the ease of distributing physical resource efficiently, (Transmission Time Interval TTI), is divided into a plurality of basic allocation unit simultaneously in frequency domain usually a physical frame to be divided into a plurality of transmission time intervals in time-domain.For example at up-to-date Long Term Evolution (Long Term Evolution, LTE) in the standard, a physical frame has comprised 10 TTI, each TTI has 14 OFDM symbols, it is the sub-piece of unit that each TTI of while has been divided in frequency domain with 12 subcarriers, and the time of (12 subcarrier in frequency domain * 14 OFDM symbols) has constituted a basic physical resource unit like this.
Fig. 1 is illustrated in interior transmission signal (Transmission Signal, TS) distribution schematic diagram of a basic physical resource unit (time-frequency two-dimensional) when having 4 transmitting antennas in the LTE system.In the example depicted in fig. 1, the white lattice represents to be used to send the time of the data-signal of each antenna, have hatched lattice and represent to be used to send the reference signal of each antenna 1～4 (Reference Signal, time RS) respectively.
In the reference signal design scheme of traditional multiple transmit antennas system, be based on the design criterion of quadrature RS mostly, i.e. the shared Resource Block mutually orthogonal of the RS of each transmitting antenna is to avoid causing interference each other at receiving terminal.In LTE Release-8 standard, the highest supported send/receive antenna is configured to 4 * 4.In order to support higher message transmission rate, effectively utilize valuable frequency spectrum resource more, LTE Release-10 (be also referred to as LET-A hereinafter, LTE-Advanced) in, need to adopt maximum 8 * 8 send/receive antenna configuration.
But, in the LET-A system,, will cause reference signal to take a large amount of physical resources if still adopt the method for designing of quadrature RS.
Therefore, for multi-aerial radio communication system, need the design and the relevant transmission method thereof of more efficient and rational reference signal with a plurality of antennas.
Listed the list of references of the present patent application below, by reference they have been contained in this, as having done detailed description in this manual.
Non-patent literature
【1】R1-090190，“RS?design?for?DL?higher?order?MIMO?in?LTE-A，”CATT，3GPP?RAN1#55bis?Meeting，Ljubljana，Slovenia，January?2009；
【2】R1-090619，“DL?RS?Designs?for?Higher?Order?MIMO，”Samsung，3GPP?TSG?RAN?WG1?#56?Athens，Greece，February?9-13，2009；
【3】R1-090144，“Design?aspects?of?high-order?MIMO?for?LTE，”Nortel，3GPP?RAN1#55bis?Meeting，Ljubljana，Slovenia，January?2009。
Patent documentation
[4] CN101166053A, " pilot signal transmission method of multi-transmitting antenna system ";
【5】WO2008045803A2，“Method?and?apparatus?for?detection?apresence?of?a?signal?in?communication?channel”；
【6】WO2008150772A1，“Methods?and?apparatus?for?improvedutilization?of?air?link?resource?in?a?wireless?communications?system”。
Summary of the invention
Provided hereinafter about brief overview of the present invention, so that basic comprehension about some aspect of the present invention is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is determined key of the present invention or pith, neither be intended to limit scope of the present invention.Its purpose only is to provide some notion with the form of simplifying, with this as the preorder in greater detail of argumentation after a while.
The objective of the invention is to propose a kind of signaling method of multi-aerial radio communication system,, guarantee the normal operation of wireless communication system so that utilize limited running time-frequency resource to send reference signal effectively and rationally at wireless communication system with a plurality of antennas.
According to an aspect of the present invention, provide a kind of sending method of multi-aerial radio communication system, having comprised: a plurality of antennas have been divided into two groups of transmitting antennas; The mode that does not overlap mutually with the reference signal time-frequency of each transmitting antenna in first group of transmitting antenna sends the reference signal and the data-signal of first group of transmitting antenna by first group of transmitting antenna; And the mode on the transmission signal of first group of transmitting antenna of being superimposed upon with the reference signal of second group of transmitting antenna sends the reference signal of second group of transmitting antenna by second group of transmitting antenna.
Preferably, the reference signal of second group of transmitting antenna only is superimposed upon in the 4th of a transmission time interval and the later OFDM symbol.The reference signal of second group of transmitting antenna both can only be superimposed upon on the data-signal in the transmission signal of first group of transmitting antenna, also can be superimposed upon on the reference signal and data-signal in the transmission signal of first group of transmitting antenna.
According to one embodiment of present invention, adopt the reference signal of second group of transmitting antenna that orthogonal code or quasiorthogonal code send second group of transmitting antenna to expand, make the mutually orthogonal or accurate quadrature of reference signal of second group of transmitting antenna that second group of transmitting antenna sends.Wherein, orthogonal code or the quasiorthogonal code that is used to expand is Harmard-Walsh sign indicating number, PN sequence or Cazac sequence.
According to another embodiment of the invention, the reference signal of second group of transmitting antenna can be the tiling signal after the tiling of the reference signal of each transmitting antenna of second group of transmitting antenna.In addition, the reference signal of second group of transmitting antenna also can be the stacked signal behind the reference signal of each transmitting antenna of second group of transmitting antenna stacked.
In according to one embodiment of present invention, the extended mode of the reference signal of second group of transmitting antenna in a transmission time interval is rectangle, square, " X " shape, " Y " shape or " Z " shape.In addition, at the different sectors in the sub-district, send reference signal in the mode of cyclic shift.
In according to another embodiment of the invention, the reference signal of second group of transmitting antenna comprises one of public reference signal that second group of transmitting antenna is public and DRS (Dedicated Reference Signal) of each transmitting antenna special use at least.Wherein, public reference signal is used to estimate channel condition information, channel quality indicator, the pre-coding matrix subscript of second group of transmitting antenna, and DRS (Dedicated Reference Signal) is used to estimate that the equivalent precoding channel of second group of transmitting antenna or estimation are used for the employed unknown parameter relevant with channel parameter of data demodulates.
According to one embodiment of present invention, the power of the reference signal of second group of transmitting antenna is less than the power of the transmission signal of first group of transmitting antenna.Wherein, be superimposed with the power of transmission signal of first group of transmitting antenna of reference signal of second group of transmitting antenna less than the power of the transmission signal of first group of transmitting antenna of the reference signal of the second group of transmitting antenna that do not superpose.
The sending method of multi-aerial radio communication system according to another embodiment of the invention also comprises: receiving feedback signals; And if feedback signal shows that second group of transmitting antenna can be used to send data-signal, then use first group of transmitting antenna and second group of transmitting antenna to send reference signal and data-signal simultaneously.
The sending method of multi-aerial radio communication system according to still a further embodiment also comprises: judge whether that the user of newtype enters the communication range of transmitting antenna; And if the user who does not have newtype enters the communication range of transmitting antenna, the mode of then only using first group of transmitting antenna not overlap mutually with the reference signal time-frequency of each transmitting antenna in first group of transmitting antenna sends the reference signal and the data-signal of first group of transmitting antenna.Wherein, first group of transmitting antenna at the user be LTE user, second group of transmitting antenna at the user be LTE-A user.
According to a further aspect in the invention, provide a kind of multi-aerial radio communication system, having comprised: modulating coder is configured to a plurality of source bits are carried out error correction coding and modulation; The multiple-input and multiple-output processing unit, be configured to the data map after modulating coder error correction coding and the modulation to the time-frequency two dimension physical resource to generate the multichannel output signal; Reference signal is inserted the unit, is configured to reference signal is inserted in each road output signal that the multiple-input and multiple-output processing unit generates send signal to generate multichannel; A plurality of antennas, each antenna are respectively applied for and send reference signal and insert multichannel that the unit the generates feed signals that sends that riches all the way accordingly in the signal; Wherein, a plurality of antennas are divided into two groups of transmitting antennas; Reference signal is inserted the reference signal that mode that the unit do not overlap mutually with the reference signal time-frequency of each transmitting antenna in first group of transmitting antenna is inserted first group of transmitting antenna; Reference signal is inserted the reference signal that mode on the unit is superimposed upon first group of transmitting antenna with the reference signal of second group of transmitting antenna the transmission signal is inserted second group of transmitting antenna; Send the reference signal and the data-signal of first group of transmitting antenna by first group of transmitting antenna; And the reference signal that sends second group of transmitting antenna by second group of transmitting antenna.
In addition, according to other aspects of the invention, corresponding computer readable storage medium and computer program are also provided.
According to multi-aerial radio communication system of the present invention and signaling method thereof, not only can realize being used to sending the saving of the running time-frequency resource of reference signal by signal stack, and by be used to estimate from the reference signal of the multilayer stack of the channel of different transmitting antennas layer with layer between mutually orthogonal or accurate quadrature, avoided the interference between the different antennae.
In addition, according to multi-aerial radio communication system of the present invention and signaling method thereof, also by power control, reduced between the different antennae interfere with each other and newtype user's reference signal to the interference of original users'data signals.Therefore, the present invention has characteristics such as expense is little, channel estimating performance is high, easy realization.
Description of drawings
The present invention can wherein use same or analogous Reference numeral to represent identical or similar parts in institute's drawings attached by being better understood with reference to hereinafter given in conjunction with the accompanying drawings description.Described accompanying drawing comprises in this manual and forms the part of this specification together with following detailed description, and is used for further illustrating the preferred embodiments of the present invention and explains principle and advantage of the present invention.In the accompanying drawings:
Fig. 1 is illustrated in the interior transmission signal distributions schematic diagram of a basic physical resource unit (time-frequency two-dimensional) when having 4 transmitting antennas in the LTE system;
Fig. 2 illustrates the process chart according to the sending method of the multi-aerial radio communication system of the embodiment of the invention;
Fig. 3 is illustrated in the schematic diagram of the user RS of the 1st sector in the LTE-A system;
Fig. 4 is illustrated in the schematic diagram of the user RS of the 2nd sector in the LTE-A system;
Fig. 5 is illustrated in the schematic diagram of the user RS of the 3rd sector in the LTE-A system; And
Fig. 6 illustrates the block diagram according to the multi-aerial radio communication system of the embodiment of the invention.
Embodiment
To be described one exemplary embodiment of the present invention in conjunction with the accompanying drawings hereinafter.For clarity and conciseness, all features of actual execution mode are not described in specification.Yet, should understand, in the process of any this practical embodiments of exploitation, must make a lot of decisions specific to execution mode, so that realize developer's objectives, for example, meet and system and professional those relevant restrictive conditions, and these restrictive conditions may change to some extent along with the difference of execution mode.In addition, might be very complicated and time-consuming though will also be appreciated that development, concerning the those skilled in the art that have benefited from present disclosure, this development only is customary task.
At this, what also need to illustrate a bit is, for fear of having blured the present invention because of unnecessary details, only show in the accompanying drawings with according to closely-related apparatus structure of the solution of the present invention and/or treatment step, and omitted other details little with relation of the present invention.
When there is polytype user exactly such as LTE user and LTE-A user in the problem to be solved in the present invention in multi-aerial radio communication system, do not influencing under the existing situation of user such as LTE user's communications quality as far as possible, practice every conceivable frugality and send such as the shared physical resource of the reference signal of pilot signal, so that effectively utilize running time-frequency resource more, improve the capacity and the efficient of whole multi-aerial radio communication system.
In order to address the above problem,, a plurality of antennas in the multi-aerial radio communication system are divided into two groups of transmitting antennas according to embodiments of the invention.Then, at existing user, such as LTE user, the mode that does not overlap mutually with the reference signal time-frequency of each transmitting antenna in first group of transmitting antenna sends the reference signal and the data-signal of first group of transmitting antenna by first group of transmitting antenna, thereby has guaranteed that existing user is such as the LTE user's communications.If the user who has newtype in system is such as LTE-A user, then when the mode that the reference signal time-frequency with each transmitting antenna in first group of transmitting antenna does not overlap mutually sends the reference signal and data-signal of first group of transmitting antenna by first group of transmitting antenna, the mode on the transmission signal of first group of transmitting antenna of being superimposed upon with the reference signal of second group of transmitting antenna sends the reference signal of second group of transmitting antenna by second group of transmitting antenna.That is to say, for the user of newtype such as LTE-A user, original user such as LTE user's transmission signal on stack LTE-A user's reference signal, and use signal after second group of transmitting antenna sends this stack.
Below with reference to the accompanying drawings, Fig. 2 to Fig. 6 particularly is an example with the system of LTE user and LTE-A user's compatibility, describes in detail according to the multi-aerial radio communication system with a plurality of antennas of the embodiment of the invention and the handling process of signaling method thereof.Generally speaking, the LTE system uses 4 transmitting antennas, and the LTE-A system then re-uses 4 transmitting antennas, hereinafter will be that example is specifically described with the multi-aerial radio communication system that comprises 8 antennas therefore.
At first describe with reference to Fig. 6 and use the multi-aerial radio communication system with a plurality of antennas of the present invention, Fig. 6 illustrates the block diagram according to the multi-aerial radio communication system of the embodiment of the invention.
As shown in Figure 6, the multi-aerial radio communication system according to this embodiment comprises modulating coder 611～61n, multiple-input and multiple-output processing unit 620, reference signal insertion unit 631～638, IFFT641～648 and a plurality of antenna 1～8.
After modulating coder 611～61n carries out error correction coding and modulation to a plurality of source bits 1～n, by the data map of multiple-input and multiple-output processing unit 620 after with modulating coder 611～61n error correction coding and modulation to the time-frequency two dimension physical resource to generate the multichannel output signal.
Next, reference signal is inserted unit 631～638 and reference signal is inserted in each road output signal that multiple-input and multiple-output processing unit 620 generates is sent signal to generate multichannel, carry out after the Fourier transform through IFFT 641～648 at last, send respectively from each antenna 1～8.
In an embodiment according to the present invention, a plurality of antennas are divided into two groups of transmitting antennas, i.e. first group of transmitting antenna 1～4 and second group of transmitting antenna 5～8.Reference signal is inserted the reference signal that mode that unit 631～634 do not overlap mutually with the reference signal time-frequency of each transmitting antenna in first group of transmitting antenna 1～4 is inserted first group of transmitting antenna 1～4.Reference signal is inserted the reference signal that mode on unit 635～638 is superimposed upon first group of transmitting antenna 1～4 with the reference signal of second group of transmitting antenna 5～8 the transmission signal is inserted second group of transmitting antenna 5～8.Send the reference signal and the data-signal of first group of transmitting antenna 1～4 by first group of transmitting antenna 1～4, and send the reference signal of second group of transmitting antenna 5～8 by second group of transmitting antenna 5～8.Concrete reference signal insertion process index map 2 to Fig. 5 hereinafter specifically describes.
Fig. 2 illustrates the process chart according to the signaling method of the multi-aerial radio communication system of the embodiment of the invention.
Here need to prove, same in this embodiment is that example describes with the multi-aerial radio communication system that comprises 8 antennas, wherein antenna 1～4 is used for original LTE user, antenna 1～8 is used for LTE-A user, but antenna 5～8 is exclusively used in the user LTE-A of newtype and is not used in original LTE user.Therefore, in this specific embodiment, first group of antenna refers to antenna 1～4, and second group of antenna refers to antenna 5～8.
As shown in Figure 2, the processing of the signaling method of this multi-aerial radio communication system is from step S201, and judges whether to exist LTE user at step S203.If judge to have LTE user, then in step S205, use first group of sky alignment LTE user to send reference signal and data-signal, wherein the reference signal time-frequency of each transmitting antenna does not overlap mutually.Here the design of the reference signal of antenna 1～4 is identical with the LTE standard, such as the transmission signal distributions in a basic physical resource unit (time-frequency two-dimensional) as shown in Figure 1, therefore is not described in detail.
Sent in step S203 after the transmission signal of antenna 1～4, if perhaps judge the current LTE user that do not exist in step S203, handling process advances to step S207.
The user who judges whether to have newtype in step S207 is such as LTE-A user, if there is no LTE-A user, and then handling process is returned step S203.
On the other hand, if in step S207, judge and have LTE-A user, then in step S209, continue to use first group of antenna 1～4 to send in LTE user's the reference signal and data-signal, use second group of antenna 5～8 to send LTE-A users' reference signal in step S211, wherein the signal that sends of antenna 5～8 is that LTE-A user's reference signal is superimposed upon formed signal on the transmission signal of first group of transmitting antenna.
Afterwards, in step S213, wait for to receive channel availability information from the LTE-A user feedback, such as channel quality indicator (Channel Quality Indicator, CQI) etc.Then, in step S215, judge the availability of LTE-A subscriber channel according to user's feedback information.If the LTE-A subscriber channel is unavailable, then handling process is returned step S203 and continuation respective handling subsequently.
Can use if in step S215, judge the LTE-A subscriber channel, then in step S217, use antenna 1～8 to send LTE-A users'data signals and reference signal.Then, handling process finishes at step S219.
Fig. 3,4,5 is illustrated in the schematic diagram of the LTE-A user RS of the 1st, 2,3 sector in this multi-aerial radio communication system respectively.At Fig. 3,4, in 5, the white lattice represents to be used to send the time of the data-signal of each antenna, light grey lattice represents to be used for the time of the reference signal of transmitting antenna 1, the lattice that has a vertical line striped represents to be used for the time of the reference signal of transmitting antenna 2, the lattice that has a right oblique line striped represents to be used for the time of the reference signal of transmitting antenna 3, the lattice that has a left oblique line striped represents to be used for the time of the reference signal of transmitting antenna 4, and the lattice that has a grid line striped has been represented and has been used to estimate the 5th, 6, the time of the channel of 7 and 8 transmitting antennas.
Each 4 * 2 rectangle RS set among Fig. 3,4,5 is the stack of 4 layers of RS sequence, and the RS sequence mutually orthogonal that is transmitted on each layer does not disturb mutually so that guarantee the RS of different transmitting antennas 5～8.Such as, can adopt the reference signal RS of second group of transmitting antenna 5～8 that orthogonal code or quasiorthogonal code send second group of transmitting antenna 5～8 to expand, make the mutually orthogonal or accurate quadrature of reference signal of second group of transmitting antenna 5～8 that second group of transmitting antenna 5～8 sends.
Here, orthogonal code that is used to expand or quasiorthogonal code can be quadrature or quasiorthogonal codes such as Harmard-Walsh sign indicating number, PN (Pseudo-random Noise, pseudo noise) sequence, Cazac sequence.
In addition, each rectangle RS of 4 * 2 set among Fig. 3,4,5 also can be the tiling RS signal after the reference signal tiling of each transmitting antenna of second group of transmitting antenna 5～8, the reference signal that is used for transmitting antenna 5 such as two lattices in the top, and then Xia Fang two lattices are used for the reference signal of transmitting antenna 6, ensuing two lattices in below are used for the reference signal of transmitting antenna 7, and two lattices bottom are used for the reference signal of transmitting antenna 8.
Certainly, the rectangular block that has the grid line striped among Fig. 3,4,5 is not limited only to the rectangle RS set of 4 * 2 shown in the figure, also can be other shape, such as shapes such as " L " shape, " X " shape, " Y " shape, " Z " shapes.
In Fig. 3,4,5, have the shared Resource Block of the lattice of grid line striped and the RS of the 1st, 2,3,4 transmitting antenna and intermesh, do not disturb mutually.That is to say that the reference signal of second group of transmitting antenna 5～8 only is superimposed upon on the data-signal in the transmission signal of first group of transmitting antenna 1～4.Certainly, the reference signal of second group of transmitting antenna 5～8 also can be superimposed upon on the reference signal and data-signal in the transmission signal of first group of transmitting antenna 1～4.
Preferably, the reference signal of second group of transmitting antenna 5～8 only is superimposed upon in the 4th of a transmission time interval and the later OFDM symbol.
For fear of transfer of data is produced bigger influence, the RS signal uses less transmitting power transmission.Wherein, the power of the reference signal of second group of transmitting antenna 5～8 is less than the power of the transmission signal of first group of transmitting antenna 1～4.Especially the power of transmission signal of first group of transmitting antenna 1～4 that is superimposed with the reference signal of second group of transmitting antenna 5～8 should be less than the power of the transmission signal of first group of transmitting antenna 1～4 of the reference signal of the second group of transmitting antenna 5～8 that do not superpose.
The RS of 3 sectors interferes with each other in the same sub-district, and in the RS of two other sector signal Figure 4 and 5, the Resource Block that has the grid line striped is for having the cyclic shift of the Resource Block of grid line striped among Fig. 3.Certainly, the RS in the Figure 4 and 5 distributes and also can adopt other different cyclic shift strategies.
Here, the lattice that has the grid line striped among Fig. 3,4,5 both can be used for second group of transmitting antenna, 5～8 public public RS (common RS CRS), also can be used for the DRS (Dedicated Reference Signal) of second group of transmitting antenna 5～8 each antenna-specific.CRS is used to estimate channel condition information (the Channel State Information of transmitting antenna, CSI), channel quality indicator (CQI), pre-coding matrix subscript (Precoding Matrix Index, PMI) or the like, DRS (Dedicated Reference Signal) is used to estimate that the equivalent precoding channel of second group of transmitting antenna 5～8 or estimation are used for the employed unknown parameter relevant with channel parameter of data demodulates.
For example, the lattice that has the grid line striped among Fig. 3,4,5 can be represented the channel information that is used to estimate each corresponding transmitting antenna 5～8,, is used for public reference signal mentioned above (CRS) that is.
Certainly, the lattice that has the grid line striped among Fig. 3,4,5 also can be represented the channel equivalence after the precoding that is used to estimate the 5th, 6,7 and 8 transmitting antenna.The rectangle RS set of each among the figure 4 * 2 is the stack of 4 layers of RS sequence, and each sampling point of rectangular-shaped RS sequence uses identical pre-coding matrix (perhaps vector) to carry out the precoding transmission in each layer.The RS of this moment is referred to as demodulation RS, and (Demodulation RS DRS), is used for data demodulates.In addition, the RS sequence of being transmitted on each layer also mutually orthogonal be used to guarantee that the RS of different transmitting antennas does not disturb mutually.
In addition, the lattice that has the grid line striped among Fig. 3,4,5 also can be represented the stack of the RS of the equivalent channel after being used to estimate the RS sequence of the 5th, 6,7 and 8 transmitting antenna and being used to estimate precoding.The rectangle RS set of each among the figure 4 * 2 is the stack of 8 layers of RS sequence, preceding 4 layers of channel information that is used to estimate 4 transmitting antennas 5～8, back 4 layers of equivalent precoding channel that is used to estimate 4 transmitting antennas.In addition, the same mutually orthogonal of RS sequence that is transmitted on each layer is used to guarantee that the RS of different transmitting antennas does not disturb mutually.
Be example with the some rectangle RS sequences among Fig. 3,4,5 below, the channel response that how to obtain transmitting antenna at receiving terminal is described.Suppose that RS sequence in some rectangles is numbered k on the time-frequency two-dimensional physical resource, k=1,2,3 ..., 8.The n layer RS that is used to estimate the channel of n transmitting antenna be defined as s (k, n), n=5,6,7,8, then (m k) is the signal r on k the Resource Unit (resource element) that receives on m reception antenna
R (m, k)=h (m, 5, k) * s (k, 6)+...+h (m, 8, k) * s (k, 8)+noise (m, k) wherein, (m k) is background noise to noise, h (m, n, k) be n transmitting antenna to the channel response of m reception antenna on k Resource Unit, note by abridging into h (m, n).Suppose that the channel response in this 4 * 2 rectangle frame is approximate constant, i.e. h (m, n, 1)=...=h (m, n, 8), utilize 8 simultaneous equations being set up on these 8 Resource Units this moment, can access whole 4 transmitting antenna 5～8 channel responses to m reception antenna.
As mentioned above, according to the sending method and the multi-aerial radio communication system of multi-aerial radio communication system of the present invention, can be at 8 transmitting antennas of LTE, LTE-A system, the 8 antenna pilot delivery plans that design has the forward compatibility characteristic.Wherein, the sending method of the RS of 1～4 original antenna and LTE conformance to standard, and the RS of the 5th～8 antenna that on LTE user's data subcarrier, superpose.Simultaneously, the RS of the 5th～8 antenna can adopt the spread processing scheme in the similar cdma system to expand on the time-frequency two-dimensional physical resource.This expansion scheme not only can reduce the interference of RS data signal, can improve the accuracy of CQI, PMI estimation and data demodulates simultaneously in the gain that receiving terminal utilizes de-spread to bring.
In addition, sending method and multi-aerial radio communication system according to multi-aerial radio communication system of the present invention, do not influencing under the situation of LTE telex network as far as possible, adopt the overlay model of data and pilot tone, common pilot and dedicated pilot to realize CSI, CQI, PMI and the estimation that is used for the required precoding channel of demodulation, therefore saved valuable running time-frequency resource.
In addition, sending method and multi-aerial radio communication system according to multi-aerial radio communication system of the present invention, reference signal is expanded in a plurality of adjacent subcarriers, realize the expansion gain, reduced the transmitted power of RS, reduced between the different layers interfere with each other and RS to the interference of LTE user data.Be used to estimate from the reference signal of the multilayer stack of the channel of different transmitting antennas layer with layer between mutually orthogonal or accurate quadrature, then avoided the interference between the different antennae.
In sum, according to the sending method and the multi-aerial radio communication system of multi-aerial radio communication system of the present invention, have characteristics such as expense is little, performance is high, easy realization.
Although illustrated and described the preferred embodiments of the present invention, it is contemplated that those skilled in the art can design various modifications of the present invention in the spirit and scope of claims.
In addition, obviously, also can realize in the mode that is stored in the computer executable program in the various machine-readable storage mediums according to each operating process of said method of the present invention.
And, purpose of the present invention also can realize by following manner: the storage medium that will store above-mentioned executable program code offers system or equipment directly or indirectly, and the said procedure code is read and carried out to the computer in this system or equipment or CPU (CPU).
At this moment, as long as this system or equipment have the function of executive program, then embodiments of the present invention are not limited to program, and this program also can be a form arbitrarily, for example, the program carried out of target program, interpreter or the shell script that offers operating system etc.
Above-mentioned these machinable mediums include but not limited to, various memories and memory cell, and semiconductor equipment, disk cell be light, magnetic and magneto optical disk for example, and other is suitable for the medium of stored information etc.
In addition, computer is by being connected to the corresponding website on the internet, and will download and be installed to according to computer program code of the present invention and carry out this program in the computer then, also can realize the present invention.
And described enforcement program of the present invention also can for example adopt the form of one or more signal.Described signal can be can be from internet sites data downloaded signal, or the data-signal that provides on carrier signal, or with the data-signal of any other form.
At last, also need to prove, in this article, only be used for an entity or operation are made a distinction with another entity or operation such as a left side and relational terms right, first and second etc., and not necessarily require or hint and have the relation of any this reality or in proper order between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Do not having under the situation of more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
Though more than describe embodiments of the invention in conjunction with the accompanying drawings in detail, should be understood that execution mode described above just is used to illustrate the present invention, and be not construed as limiting the invention.For a person skilled in the art, can make various changes and modifications above-mentioned execution mode and do not deviate from the spirit and scope of the invention.Therefore, scope of the present invention is only limited by appended claim and equivalents thereof.
Claims (15)
1. the sending method of a multi-aerial radio communication system comprises:
A plurality of antennas are divided into two groups of transmitting antennas;
The mode that does not overlap mutually with the reference signal time-frequency of each transmitting antenna in first group of transmitting antenna sends the reference signal and the data-signal of first group of transmitting antenna by first group of transmitting antenna; And
The mode on the transmission signal of first group of transmitting antenna of being superimposed upon with the reference signal of second group of transmitting antenna sends the reference signal of second group of transmitting antenna by second group of transmitting antenna.
2. sending method according to claim 1, wherein the reference signal of second group of transmitting antenna only is superimposed upon in the 4th of a transmission time interval and the later OFDM symbol.
3. sending method according to claim 2, wherein the reference signal of second group of transmitting antenna both can only be superimposed upon on the data-signal in the transmission signal of first group of transmitting antenna, also can be superimposed upon on the reference signal and data-signal in the transmission signal of first group of transmitting antenna.
4. according to the described sending method of each claim in the claim 1 to 3, wherein adopt the reference signal of second group of transmitting antenna that orthogonal code or quasiorthogonal code send second group of transmitting antenna to expand, make the mutually orthogonal or accurate quadrature of reference signal of second group of transmitting antenna that second group of transmitting antenna sends.
5. sending method according to claim 4, wherein the reference signal of second group of transmitting antenna is the tiling signal after the tiling of reference signal of each transmitting antenna of second group of transmitting antenna.
6. sending method according to claim 4, wherein the reference signal of second group of transmitting antenna is the stacked signal behind reference signal stacked of each transmitting antenna of second group of transmitting antenna.
7. according to claim 5 or 6 described sending methods, wherein the extended mode of the reference signal of second group of transmitting antenna in a transmission time interval is rectangle, square, " X " shape, " Y " shape or " Z " shape.
8. sending method according to claim 7 wherein at the different sectors in the sub-district, sends reference signal in the mode of cyclic shift.
9. sending method according to claim 8, wherein the reference signal of second group of transmitting antenna comprises one of public reference signal that second group of transmitting antenna is public and DRS (Dedicated Reference Signal) of each transmitting antenna special use at least.
10. sending method according to claim 9, wherein public reference signal is used to estimate channel condition information, channel quality indicator, the pre-coding matrix subscript of second group of transmitting antenna, and DRS (Dedicated Reference Signal) is used to estimate that the equivalent precoding channel of second group of transmitting antenna or estimation are used for the employed unknown parameter relevant with channel parameter of data demodulates.
11. sending method according to claim 10, wherein the power of the reference signal of second group of transmitting antenna is less than the power of the transmission signal of first group of transmitting antenna.
12. sending method according to claim 11, the power of transmission signal of first group of transmitting antenna of reference signal that wherein is superimposed with second group of transmitting antenna is less than the power of the transmission signal of first group of transmitting antenna of the reference signal of the second group of transmitting antenna that do not superpose.
13. the described sending method of each claim in 12 according to Claim 8 also comprises:
Receiving feedback signals; And
If feedback signal shows second group of transmitting antenna and can be used to send data-signal, then use first group of transmitting antenna and second group of transmitting antenna to send reference signal and data-signal simultaneously.
14. the described sending method of each claim in 12 according to Claim 8 also comprises:
Judge whether that the user of newtype enters the communication range of transmitting antenna; And
If there is not the user of newtype to enter the communication range of transmitting antenna, the mode of then only using first group of transmitting antenna not overlap mutually with the reference signal time-frequency of each transmitting antenna in first group of transmitting antenna sends the reference signal and the data-signal of first group of transmitting antenna.
15. a multi-aerial radio communication system comprises:
Modulating coder is configured to a plurality of source bits are carried out error correction coding and modulation;
The multiple-input and multiple-output processing unit, be configured to the data map after modulating coder error correction coding and the modulation to the time-frequency two dimension physical resource to generate the multichannel output signal;
Reference signal is inserted the unit, is configured to reference signal is inserted in each road output signal that the multiple-input and multiple-output processing unit generates send signal to generate multichannel;
A plurality of antennas, each antenna are respectively applied for and send reference signal and insert multichannel that the unit the generates feed signals that sends that riches all the way accordingly in the signal;
Wherein, a plurality of antennas are divided into two groups of transmitting antennas;
Reference signal is inserted the reference signal that mode that the unit do not overlap mutually with the reference signal time-frequency of each transmitting antenna in first group of transmitting antenna is inserted first group of transmitting antenna;
Reference signal is inserted the reference signal that mode on the unit is superimposed upon first group of transmitting antenna with the reference signal of second group of transmitting antenna the transmission signal is inserted second group of transmitting antenna;
Send the reference signal and the data-signal of first group of transmitting antenna by first group of transmitting antenna; And
Send the reference signal of second group of transmitting antenna by second group of transmitting antenna.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753573A (en) * | 2013-12-31 | 2015-07-01 | 中兴通讯股份有限公司 | Space division multiplexing implementation method, system, base station and terminal |
| CN110278003A (en) * | 2019-06-24 | 2019-09-24 | Oppo广东移动通信有限公司 | A kind of method, electronic device and storage medium reducing inter-antenna interference |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8559295B2 (en) * | 2005-08-15 | 2013-10-15 | Motorola Mobility Llc | Method and apparatus for pilot signal transmission |
| CN101179317A (en) * | 2006-11-09 | 2008-05-14 | 中兴通讯股份有限公司 | Orthogonal frequency division multiplexing based pilot signal transmitting method of multi-transmission antenna system |
| CN101340228B (en) * | 2008-08-07 | 2014-05-28 | 中兴通讯股份有限公司南京分公司 | Transmission method of reference signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753573A (en) * | 2013-12-31 | 2015-07-01 | 中兴通讯股份有限公司 | Space division multiplexing implementation method, system, base station and terminal |
| WO2015100939A1 (en) * | 2013-12-31 | 2015-07-09 | 中兴通讯股份有限公司 | Method for realizing space division multiplexing, base station and terminal |
| CN110278003A (en) * | 2019-06-24 | 2019-09-24 | Oppo广东移动通信有限公司 | A kind of method, electronic device and storage medium reducing inter-antenna interference |
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