CN101286777A - Signal transmitting method based on multiple antennas, transmitting device and receiving device - Google Patents

Abstract

The invention discloses a signal sending method based on a multi-antenna, which comprises the obtaining of information fed back from a receiving end and used for indicating a signal transmitting mode by a transmitting end, the selecting of corresponding antenna combination by the transmitting end according to the feedback information from the receiving end and the sending of Alanouti space-time block codes signals based on the selected antenna combination. The invention also discloses relevant multi-antenna signal transmitting equipment and multi-antenna signal receiving equipment corresponding to the method of the invention. The invention leads the receiving end to obtain better signal diversity gains during the signal receiving process in an MIMO communication system.

Description

Based on many antenna signal sending method, transmitting apparatus and receiving equipment thereof

Technical field

The present invention relates to the mobile communication technology field, especially relate to a kind of based on many antenna signal sending method, and relevant apparatus for transmitting signal and receiving equipment.

Background technology

According to the mobile communication theory, at the transmitting terminal or the receiving terminal of mobile communication system, perhaps two ends use multi-antenna array can improve the transmission bit rate of system greatly simultaneously.Multiple-input and multiple-output (MIMO wherein, Multi-Input Multi-Output) technology is exactly the signal transmission technology that produces according to this theory, the concrete operation principle of MIMO is meant at signal transmitting terminal and receiving terminal uses a plurality of transmitting antennas and reception antenna respectively, signal transmits and receives by a plurality of antennas of transmitting terminal and receiving terminal, thereby improves each quality of services for users (bit error rate or data rate).

Space-Time Block Coding refers to based on Space Time Coding (STC, Space-Time Coding) technology is to the signal resulting code word of encoding, space diversity (Diversity) gain that Space Time Coding has utilized mimo channel to provide in BER-SNR curve commonly used, shows as and can obtain steeper slope.In the STC technology according to the difference of coded system, can be divided into space-time grid coding (STTC, Space Time Trellis Coding), topological encode (Space Time Turbo Coding) when empty, space-time block code (STBC, Space TimeBlock Coding), differential space time group coding (DSTBC) or the like, wherein Alamouti Space-Time Block Coding scheme is the simple and classical special case of STBC.

In MIMO communication system, can use the Alamouti Space-Time Block Coding to come transmission signals usually at present, to obtain better diversity gain based on many antennas.And in Alamouti Space-Time Block Coding transmission technology, transmitting terminal generally can use two transmitting antennas simultaneously, carries out signal according to emission mode shown in Figure 1 and sends, be i.e. antenna transmission signal a in a symbol period ₁, another antenna transmission signal-a ₂ ^*Antenna transmission signal a in another symbol period ₂, another antenna transmission signal a ₁ ^*, signal a wherein ₁With a ₁ ^*, signal a ₂With a ₂ ^*Conjugation each other.Receiving terminal can use one or more reception antenna to carry out the reception of signal, with diversity (diversity) gain that obtains these two transmitting antennas.

In order in the MIMO communication system, to obtain more diversity gain based on Alamouti Space-Time Block Coding transmission signals, prior art proposes in open loop (Open Loop) MIMO communication system, transmitting terminal uses 4 antennas to carry out signal simultaneously and sends, and wherein 4 transmitting antennas can carry out the signal transmission based on following MIMO pattern:

$A^{\′}=\left[\begin{array}{cccc}{s}_i& s_{i+1}& 0& 0\\ -s_{i+1}^{*}& s_i^{*}& 0& 0\\ 0& 0& s_{i+2}& s_{i+3}\\ 0& 0& -s_{i+3}^{*}& s_{i+2}^{*}\end{array}\right]$

Above-mentioned matrix A ' each row element represent each symbol period in the Transmission Time Interval (TTI) respectively, and pairing two symbol periods of adjacent two row are continuous in time-domain or frequency domain, or the channel situation of adjacent at least pairing two symbol periods of two row can be similar to regard as constant.

Introduce the notion of TTI and symbol period below respectively:

In order to resist channel fading, and the error of transmission that brings of the interference of channel and noise, transmitting terminal is divided into a plurality of packets (Block) to the data of needs transmission, information bit in the same packet is carried out chnnel coding and interweaves, be modulated into a plurality of symbols again by Channel Transmission, and transmit the length that so needed time span of packet has determined a TTI.Receiving terminal receives all symbols that comprise in the same packet earlier, carries out deinterleaving and decoding again.Promptly a TTI just is meant the time interval of transmitting such packet.

And each symbol in the packet that is transmitted in TTI can be distributed in different interval on the time domain, perhaps is distributed in different interval on the frequency domain, perhaps is distributed in the different intervals on the two dimensional surface of time domain and frequency domain.Symbol period here just is meant an interval that symbol takies by Channel Transmission, the interval that perhaps takies, the perhaps interval that takies on the two dimensional surface of time domain and frequency domain on frequency domain on time domain.For example, packet uses 8 OFDM symbols on the time domain, each OFDM symbol takies 16 subcarriers on the frequency domain, symbol period so, just be meant an interval on the two dimensional surface of time domain and frequency domain, 1 subcarrier on 1 OFDM symbol on the time domain just, and this packet has 8 * 16=128 symbol period.

When adopting above-mentioned A ' to transmit, the number of receiving terminal reception antenna only need get final product greater than 1, can be 1,2 or 4, is transmit antenna number antenna 1,2,3,4, can see in this scheme, on antenna 1,2, launch two symbols (symbol) vector [s at first respectively _is _I+1] and [s _I+1 ^*s _i ^*], on antenna 3,4, launch two symbolic vector [s more respectively _I+2s _I+3] and [s _I+3 ^*s _I+2 ^*].Two symbols (symbol) vector [s that wherein on antenna 1,2, launches _is _I+1] and [s _I+1 ^*s _i ^*] form one group of Alamouti Space-Time Block Coding, and two symbolic vector [s that on antenna 3,4, launch _I+2s _I+3] and [s _I+3 ^*s _I+2 ^*] form another group Alamouti Space-Time Block Coding.

When but 4 antennas carry out the signal transmission based on this MIMO pattern, always select two antennas 1,2 in two symbols from 4 transmitting antennas, it transmits and forms one group of Alamouti Space-Time Block Coding; Be to select two antennas 3,4 from 4 transmitting antennas in ensuing two symbols, it transmits and forms another group Alamouti Space-Time Block Coding.And from 4 transmitting antennas, select 2 transmitting antennas, have 6 kinds of combinations altogether, be respectively and select antenna 1,2, select antenna 1,3, select antenna 1,4, select antenna 2,3, select antenna 2,4, select antenna 3,4, but be not that every kind of combination all has best transmission performance in these combinations, therefore transmitting terminal 2 antennas of selecting in 4 transmitting antennas at random carry out the transmission of Alamouti Space-Time Block Coding, and receiving terminal might not access optimal signal diversifying gain.

In addition, 4 transmitting antennas can also carry out the signal transmission based on following MIMO pattern:

$B^{\′}=\left[\begin{array}{cccc}{s}_i& s_{i+1}& s_{i+2}& s_{i+3}\\ -s_{i+1}^{*}& s_i^{*}& -s_{i+3}^{*}& s_{i+2}^{*}\\ s_{i+4}& s_{i+6}& s_{i+5}& s_{i+7}\\ -s_{i+5}^{*}& -s_{i+7}^{*}& s_{i+4}^{*}& s_{i+6}^{*}\\ s_{i+8}& s_{i+10}& s_{i+11}& s_{i+9}\\ -s_{i+9}^{*}& -s_{i+11}^{*}& s_{i+10}^{*}& s_{i+8}^{*}\end{array}\right]$

Each row element of above-mentioned matrix is represented each symbol period in the TTI respectively, and the number of receiving terminal reception antenna only need get final product greater than 2, can be 2 or 4, is transmit antenna number antenna 1,2,3,4, can see in this scheme, at two symbol period internal antennas 1, one group of Alamouti Space-Time Block Coding is formed in 2 transmit, and another group Alamouti Space-Time Block Coding is formed in transmitting of antenna 3,4; Be that transmitting of antenna 1,3 formed one group of Alamouti Space-Time Block Coding in ensuing two symbol periods, another group Alamouti Space-Time Block Coding is formed in transmitting of antenna 2,4; Be that transmitting of antenna 1,4 formed one group of Alamouti Space-Time Block Coding in ensuing again two symbol periods, another group Alamouti Space-Time Block Coding is formed in transmitting of antenna 2,3.But 4 antennas of present transmitting terminal always are used alternatingly above-mentioned 3 kinds of combinations carries out the signal transmission, but be not that every kind of combination all has best transmission performance in these combinations, therefore transmitting terminal is used alternatingly above-mentioned 3 kinds of combinations and carries out signal and send, and receiving terminal might not access optimal signal diversifying gain.

Summary of the invention

The embodiment of the invention proposes a kind of based on many antenna signal sending method, sends so that transmitting terminal carries out signal according to the indication of receiving terminal, thereby makes receiving terminal obtain better signal diversifying gain.

The proposition that the embodiment of the invention is also corresponding based on the apparatus for transmitting signal and the signal receiver thereof of many antennas.

The embodiment of the invention proposes a kind of based on many antenna signal sending method, comprises step: transmitting terminal obtains the information that is used to indicate the signalling formula of receiving terminal feedback, and transmitting terminal is selected corresponding combination of antennas according to the described information of receiving terminal feedback; And based on the combination of antennas transmission Alamouti Space-Time Block Coding signal of selecting.

Preferably described being used for indicates the information of signalling formula to be: a kind of transmission mode information of each multiple-input and multiple-output transmission mode of transmitting terminal and receiving terminal agreement.

Preferably describedly be used to indicate the information of signalling formula to be: combination of antennas information.

The embodiment of the invention also proposes a kind of apparatus for transmitting signal based on many antennas, comprises the information acquisition unit, is used to obtain the information that is used to indicate the signalling formula of receiving terminal feedback; The antenna selected cell is used for the send mode information according to the acquisition of information acquisition unit, selects corresponding combination of antennas; And signal transmitting unit, the combination of antennas that is used for selecting based on the antenna selected cell sends Alamouti Space-Time Block Coding signal.

The embodiment of the invention also proposes a kind of signal receiver based on many antennas, comprises the feedback information determining unit, is used for definite information that is used to indicate the signalling formula to the transmitting terminal feedback; The feedback information unit, the signalling formula feedback information that is used for the feedback information determining unit is determined is given transmitting terminal.

The embodiment of the invention makes full use of the characteristic that communication channel remains unchanged substantially in a TTI, proposition is carried out under the situation of signal transmission based on the Alamouti Space-Time Block Coding in mimo wireless communication system, make receiving terminal in each TTI, or in a plurality of TTI, feed back the signalling formula information that can access better receptivity when once transmitting based on the Alamouti Space-Time Block Coding to transmitting terminal, thereby make transmitting terminal choose corresponding transmitting antenna according to the signalling formula of receiving terminal feedback, and carry out Alamouti Space-Time Block Coding signal based on the emitting antenna combination of choosing and launch, will make receiving terminal in the received signal process, obtain better signal diversifying gain based on this processing mode.

Description of drawings

For making implementation process of the present invention and more clear to the beneficial effect that should be able to reach, be described in detail below in conjunction with the specific implementation process of each accompanying drawing technical solution of the present invention, in each accompanying drawing:

Fig. 1 is for having the communication system at MIMO now, and transmitting terminal sends the emission mode schematic diagram of signal based on Alamouti Space-Time Block Coding transmission technology;

Fig. 2 is the tool that uses multi-antenna array at transmitting terminal and the receiving terminal simultaneously mimo wireless communication system schematic diagram of framework at one's leisure;

Fig. 3 is the embodiment flow chart that the present invention is based on many antenna signal sending method;

Fig. 4 the present invention is based on the apparatus for transmitting signal of many antennas and the embodiment of signal receiver forms structured flowchart.

Embodiment

In mobile communication system, a common packet (data block) that includes a plurality of symbols is at a Transmission Time Interval (TTI, when transmitting Transmission Time Interval), can assert that the lasting time of this TTI is enough short, the basic condition that is to say channel in a TTI can remain unchanged, and has constant channel matrix H.Technical solution of the present invention has made full use of these characteristics of communication system just, make receiving terminal in each TTI, or in a plurality of TTI, feed back the signalling formula information that can access better receptivity when once transmitting based on the Alamouti Space-Time Block Coding to transmitting terminal, thereby make transmitting terminal choose corresponding transmitting antenna according to the signalling formula information of receiving terminal feedback, and carry out Alamouti Space-Time Block Coding signal based on the emitting antenna combination of choosing and launch, will make receiving terminal in the received signal process, obtain better signal diversifying gain based on this processing mode.

Please refer to Fig. 2, show the tool mimo wireless communication system of framework at one's leisure that uses multi-antenna array simultaneously at transmitting terminal and receiving terminal, wherein can be divided into n incoherent code element subsequence at signal flow of transmitting terminal, each subsequence is launched by in n the transmitting antenna one of them.N subsequence can be received by n reception antenna at receiving terminal after being the Channel Transmission of H through a channel matrix.In this communication system, the number n of transmitting terminal transmitting antenna is minimum to be 2, and the minimum number of receiving terminal reception antenna is the number of transmit antennas n of transmitting terminal.

Please refer to Fig. 3, for the present invention is based on the embodiment flow chart of many antenna signal sending method, at first transmitting terminal obtains the information that is used to indicate the signalling formula of receiving terminal feedback, can make receiving terminal obtain receptivity (step 10) preferably when transmitting terminal transmits based on the Alamouti Space-Time Block Coding according to the signalling formula information of this acquisition usually; Transmitting terminal is selected corresponding combination of antennas (step 20) according to the signalling formula information of receiving terminal feedback in a plurality of antennas of configuration; Transmitting terminal sends Alamouti Space-Time Block Coding signal (step 30) based on the combination of antennas of selecting then.

Wherein receiving terminal feed back to transmitting terminal be used for indicate the information of signalling formula can be, can make receiving terminal obtain a MIMO transmission mode information of better receptivity for each MIMO transmission mode of transmitting terminal and receiving terminal agreement; Can also obtain the emitting antenna combination information of better receptivity for making receiving terminal.

If transmitting terminal and receiving terminal have been appointed each MIMO transmission mode, can give a mark for each MIMO transmission mode of agreement, receiving terminal can determine to access the MIMO transmission mode of better receptivity, mark with definite MIMO transmission mode feeds back to transmitting terminal then, transmitting terminal just can learn that according to the MIMO transmission mode mark of receiving terminal feedback using which kind of MIMO transmission mode to carry out Alamouti Space-Time Block Coding signal sends.Determine to feed back to transmitting terminal MIMO transmission mode mark process can but be not limited to realize by following manner:

Receiving terminal at first calculates when utilizing each MIMO transmission mode of arranging to carry out the transmission of Alamouti Space-Time Block Coding signal, the message transmission throughput that can access respectively, when wherein receiving terminal calculating is carried out the signal transmission according to every kind of MIMO transmission mode based on the Alamouti Space-Time Block Coding, the message transmission throughput that receiving terminal can access is a known technology, will not describe in detail here; Receiving terminal is according to result of calculation, with the label information of the MIMO transmission mode correspondence of message transmission throughput maximum as the signalling formula information that will feed back to transmitting terminal.

In order to make receiving terminal in the received signal process, obtain better diversity gain performance, can consider that in each TTI receiving terminal is respectively to signalling formula information of transmitting terminal feedback; Certainly the embodiment of the invention can also be utilized the characteristic of channel gradual change here, require receiving terminal at least two TTI, to feed back a signalling formula information to transmitting terminal, can be so that receiving terminal just feeds back a signalling formula information to transmitting terminal in every several TTI, so that needed overhead diminishes on the basis that obtains above-mentioned better diversity gain performance.

According to the realization principle of the embodiment of the invention, an instantiation can consider in open loop (OpenLoop) MIMO communication system, and transmitting terminal uses 4 transmitting antennas to carry out signal when sending simultaneously, with its based on the MIMO emission mode:

$A^{\′}=\left[\begin{array}{cccc}{s}_i& s_{i+1}& 0& 0\\ -s_{i+1}^{*}& s_i^{*}& 0& 0\\ 0& 0& s_{i+2}& s_{i+3}\\ 0& 0& -s_{i+3}^{*}& s_{i+2}^{*}\end{array}\right]$

Modification becomes: A1 ' (i), i=1,2 ..., 6, wherein be respectively:

$\left[\begin{array}{cccc}{s}_i& s_{i+1}& 0& 0\\ -s_{i+1}^{*}& s_i^{*}& 0& 0\end{array}\right],\left[\begin{array}{cccc}{s}_i& 0& s_{i+1}& 0\\ -s_{i+1}^{*}& 0& s_i^{*}& 0\end{array}\right],\left[\begin{array}{cccc}{s}_i& 0& 0& s_{i+1}\\ -s_{i+1}^{*}& 0& 0& s_i^{*}\end{array}\right],$

$\left[\begin{array}{cccc}0& s_i& s_{i+1}& 0\\ 0& -s_{i+1}^{*}& s_i^{*}& 0\end{array}\right],\left[\begin{array}{cccc}0& s_i& 0& s_{i+1}\\ 0& -s_{i+1}^{*}& 0& s_i^{*}\end{array}\right],\left[\begin{array}{cccc}0& 0& s_i& s_{i+1}\\ 0& 0& -s_{i+1}^{*}& s_i^{*}\end{array}\right];$

Wherein receiving terminal is in each TTI, or feed back once to transmitting terminal in every several TTI: decision is used A1 ' (i), i=1,2, ..., which MIMO transmission mode in 6 (this MIMO transmission mode used that determines can make receiving terminal obtain receptivity preferably), the MIMO transmission mode of these supports because transmitting terminal and receiving terminal can be made an appointment, therefore can directly feed back the MIMO transmission mode mark i that is adopted, transmitting terminal is selected corresponding MIMO transmission mode to carry out Alamouti Space-Time Block Coding signal and is sent according to the MIMO transmission mode mark i of receiving terminal feedback then.

Perhaps above-mentioned existing MIMO transmission mode A ' is revised as: A ' 1 (m), m=1,2,3, be respectively:

$\left[\begin{array}{cccc}{s}_i& s_{i+1}& 0& 0\\ -s_{i+1}^{*}& s_i^{*}& 0& 0\\ 0& 0& s_{i+2}& s_{i+3}\\ 0& 0& -s_{i+3}^{*}& s_{i+2}^{*}\end{array}\right],\left[\begin{array}{cccc}{s}_i& 0& s_{i+1}& 0\\ -s_{i+1}^{*}& 0& s_i^{*}& 0\\ 0& s_{i+2}& 0& s_{i+3}\\ 0& -s_{i+3}^{*}& 0& s_{i+2}^{*}\end{array}\right],\left[\begin{array}{cccc}{s}_i& 0& 0& s_{i+1}\\ -s_{i+1}^{*}& 0& 0& s_i^{*}\\ 0& s_{i+2}& s_{i+3}& 0\\ 0& -s_{i+3}^{*}& s_{i+2}^{*}& 0\end{array}\right]$

Receiving terminal feeds back once to transmitting terminal in each TTI or in every several TTI: A ' 1 (m) is used in decision, m=1,2, which MIMO transmission mode in 3 (this MIMO transmission mode used that determines can make receiving terminal obtain receptivity preferably), the MIMO transmission mode mark i that receiving terminal can directly be adopted to the transmitting terminal feedback, transmitting terminal is selected corresponding MIMO transmission mode to carry out Alamouti Space-Time Block Coding signal and is sent according to the MIMO transmission mode mark i of receiving terminal feedback then.The MIMO transmission mode information that adopts every several TTI just to feed back once to be adopted can reduce required feedback information volume, has saved expense;

According to the realization principle of the embodiment of the invention, another instantiation can consider in open loop (OpenLoop) MIMO communication system, and transmitting terminal uses 4 transmitting antennas to carry out signal when sending simultaneously, with its based on the MIMO emission mode:

$B^{\′}=\left[\begin{array}{cccc}{s}_i& s_{i+1}& s_{i+2}& s_{i+3}\\ -s_{i+1}^{*}& s_i^{*}& -s_{i+3}^{*}& s_{i+2}^{*}\\ s_{i+4}& s_{i+6}& s_{i+5}& s_{i+7}\\ {-s}_{i+5}^{*}& {-s}_{i+7}^{*}& s_{i+4}^{*}& s_{i+6}^{*}\\ s_{i+8}& s_{i+10}& s_{i+11}& s_{i+9}\\ {-s}_{i+9}^{*}& {-s}_{i+11}^{*}& s_{i+10}^{*}& s_{i+8}^{*}\end{array}\right]$

Modification becomes: B1 ' (k), k=1,2,3, wherein be respectively:

$\left[\begin{array}{cccc}{s}_i& s_{i+1}& s_{i+2}& s_{i+3}\\ -s_{i+1}^{*}& s_i^{*}& -s_{i+3}^{*}& s_{i+2}^{*}\end{array}\right],\left[\begin{array}{cccc}{s}_i& s_{i+1}& s_{i+2}& s_{i+3}\\ {-s}_{i+2}^{*}& {-s}_{i+3}^{*}& s_i^{*}& s_{i+1}^{*}\end{array}\right],\left[\begin{array}{cccc}{s}_i& s_{i+1}& s_{i+2}& s_{i+3}\\ -s_{i+3}^{*}& {-s}_{i+2}^{*}& s_{i+1}^{*}& s_i^{*}\end{array}\right];$

Receiving terminal feeds back once to transmitting terminal in each TTI or in every several TTI: decision is used B1 ' (k), k=1,2, which MIMO transmission mode in 3 (this MIMO transmission mode used that determines can make receiving terminal obtain receptivity preferably), the MIMO transmission mode mark k that receiving terminal can directly be adopted to the transmitting terminal feedback, transmitting terminal is selected corresponding MIMO transmission mode to carry out Alamouti Space-Time Block Coding signal and is sent according to the MIMO transmission mode mark k of receiving terminal feedback then.The MIMO transmission mode information that adopts every several TTI just to feed back once to be adopted can reduce required feedback information volume, has saved expense

Please refer to Fig. 4, for the apparatus for transmitting signal that the present invention is based on many antennas and the embodiment of signal receiver form structured flowchart, wherein comprise information acquisition unit 501 in the apparatus for transmitting signal 50 based on many antennas, what be used to obtain the receiving terminal feedback is used to indicate signalling formula information, when transmitting terminal carries out the transmission of Alamouti Space-Time Block Coding signal according to the signalling formula information of receiving terminal feedback usually, can make receiving terminal obtain receptivity preferably; Antenna selected cell 502 is used for the signalling formula information that obtained according to above-mentioned information acquisition unit 501, selects corresponding combination of antennas, promptly selects corresponding antenna to make up in a plurality of antennas of configuration; And signal transmitting unit 503, be used for sending Alamouti Space-Time Block Coding signal based on above-mentioned antenna selected cell 502 selected combination of antennas.Wherein information acquisition unit 501 can obtain the information that is used to indicate the signalling formula of a receiving terminal feedback in each TTI, also can obtain the information that is used to indicate the signalling formula (promptly obtaining the information that is used to indicate the signalling formula of a receiving terminal feedback in a plurality of TTI) of a receiving terminal feedback at least two TTI.Wherein the transmitting apparatus here can be upgraded on existing multi-antenna base station equipment and obtained, and the above-mentioned processing unit that each increases newly can be realized based on software program, also can realize based on hardware facility.

Corresponding, comprise feedback information determining unit 601 in the signal receiver 60 based on many antennas, be used for definite information that is used to indicate the signalling formula to the transmitting terminal feedback, when wherein transmitting terminal carries out the transmission of Alamouti Space-Time Block Coding signal according to the signalling formula information of receiving terminal feedback, can make receiving terminal obtain receptivity preferably; Feedback information unit 602 is used for giving transmitting terminal with the signalling formula feedback information that above-mentioned feedback information determining unit 601 is determined.

Wherein receiving terminal can also can be combination of antennas information for a kind of transmission mode information in each MIMO transmission mode of transmitting terminal and receiving terminal agreement to the signalling formula information of transmitting terminal feedback.Wherein when feedback information is the MIMO transmission mode information, in the feedback information determining unit 601 and then comprise throughput calculation subelement 6011, be used to calculate each MIMO transmission mode of utilizing transmitting terminal and receiving terminal agreement and carry out Alamouti Space-Time Block Coding signal when sending, the message transmission throughput that can access respectively, wherein calculate when utilizing every kind of MIMO transmission mode to carry out the signal transmission based on the Alamouti Space-Time Block Coding, the message transmission throughput processing procedure that receiving terminal can access belongs to known technology, no longer elaborates here; And information determines subelement 6012, is used for the result of calculation according to throughput calculation subelement 6011, with the information of the MIMO transmission mode correspondence of message transmission throughput maximum as the transmission mode information that will feed back to transmitting terminal.Here only be to have enumerated a kind of feedback information determining unit 601 definite a kind of preferable implementations that will feed back to the signalling formula information of transmitting terminal, in addition do not get rid of other implementation that other can determine to feed back to transmitting terminal signalling formula information.Wherein feedback information determining unit 601 can be determined one time signalling formula information in each TTI, and correspondingly feedback information unit 602 feeds back a signalling formula information to transmitting terminal in each TTI.Feedback information determining unit 601 can also be determined one time signalling formula information at least two TTI in addition, correspondingly feedback information unit 602 feeds back a signalling formula information to transmitting terminal at least two TTI, here selecting every a plurality of TTI to determine a signalling formula information and feed back to transmitting terminal is the roll-off characteristic of considering channel, to save the shared channel overhead of feedback information.In like manner, the receiving equipment here also can be upgraded on existing multi-antenna base station equipment and be obtained, and the above-mentioned processing unit that each increases newly can be realized based on software program, also can realize based on hardware facility.

In sum, the embodiment of the invention is in mimo wireless communication system, in the process of carrying out the signal transmission based on the Alamouti Space-Time Block Coding, the signalling formula information processing that increase is adopted to the transmitting terminal feedback by receiving terminal, when wherein transmitting terminal carries out the signal transmission according to the signalling formula of feedback based on the Alamouti Space-Time Block Coding, can make receiving terminal obtain receptivity preferably, when transmitting terminal carries out the transmission of Alamouti Space-Time Block Coding signal according to the corresponding emitting antenna combination of signalling formula Information Selection of receiving terminal feedback like this, can make receiving terminal carry out obtaining better diversity gain performance when signal receives based on many antennas.Receiving terminal can further reduce the overhead of transmission channel so just to signalling formula information of transmitting terminal feedback in a plurality of TTI in the corresponding embodiment of the invention on the basis that obtains better diversity gain performance.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (14)

1, a kind ofly it is characterized in that, comprise step based on many antenna signal sending method:

Transmitting terminal obtains the information that is used to indicate the signalling formula of receiving terminal feedback,

Transmitting terminal is selected corresponding combination of antennas according to the described information of receiving terminal feedback; And

Send Alamouti Space-Time Block Coding signal based on the combination of antennas of selecting.

2, the method for claim 1 is characterized in that, described being used for indicates the information of signalling formula to be: a kind of transmission mode information of each multiple-input and multiple-output transmission mode of transmitting terminal and receiving terminal agreement.

3, method as claimed in claim 2 is characterized in that, receiving terminal determines that the transmission mode information of feedback specifically comprises:

When receiving terminal calculating utilizes each multiple-input and multiple-output transmission mode of described agreement to carry out the transmission of Alamouti Space-Time Block Coding signal, the message transmission throughput that can access respectively; And

With the information of the transmission mode correspondence of message transmission throughput maximum as the transmission mode information that feeds back to transmitting terminal.

As claim 2 or 3 described methods, it is characterized in that 4, described receiving terminal feeds back a transmission mode information to transmitting terminal in each Transmission Time Interval.

As claim 2 or 3 described methods, it is characterized in that 5, described receiving terminal feeds back a transmission mode information to transmitting terminal at least two Transmission Time Intervals.

6, the method for claim 1 is characterized in that, describedly is used to indicate the information of signalling formula to be: combination of antennas information.

7, a kind of apparatus for transmitting signal based on many antennas is characterized in that, comprising:

The information acquisition unit is used to obtain the information that is used to indicate the signalling formula that receiving terminal feeds back;

The antenna selected cell is used for the send mode information according to the acquisition of information acquisition unit, selects corresponding combination of antennas; And

Signal transmitting unit, the combination of antennas that is used for selecting based on the antenna selected cell sends Alamouti Space-Time Block Coding signal.

8, equipment as claimed in claim 7 is characterized in that, described information acquisition unit obtains the signalling formula information of a receiving terminal feedback in each Transmission Time Interval.

9, equipment as claimed in claim 7 is characterized in that, described information acquisition unit obtains the signalling formula information of a receiving terminal feedback at least two Transmission Time Intervals.

10, a kind of signal receiver based on many antennas is characterized in that, comprising:

The feedback information determining unit is used for definite information that is used to indicate the signalling formula to the transmitting terminal feedback;

The feedback information unit, the signalling formula feedback information that is used for the feedback information determining unit is determined is given transmitting terminal.

11, equipment as claimed in claim 10 is characterized in that, described being used for indicates the information of signalling formula to be: a kind of transmission mode information of each multiple-input and multiple-output transmission mode of transmitting terminal and receiving terminal agreement.

12, equipment as claimed in claim 11 is characterized in that, described feedback information determining unit specifically comprises:

The throughput calculation subelement is used to calculate each multiple-input and multiple-output transmission mode of utilizing described agreement and carries out Alamouti Space-Time Block Coding signal when sending, the message transmission throughput that can access respectively; And

Information is determined subelement, is used for the result of calculation according to the throughput calculation subelement, with the information of the transmission mode correspondence of message transmission throughput maximum as the transmission mode information that feeds back to transmitting terminal.

13, as claim 11 or 12 described equipment, it is characterized in that, described feedback information determining unit is determined a transmission mode information in each Transmission Time Interval, and the feedback information unit feeds back a transmission mode information to transmitting terminal in each Transmission Time Interval.

14, as claim 11 or 12 described equipment, it is characterized in that, described feedback information determining unit is determined a transmission mode information at least two Transmission Time Intervals, and the feedback information unit feeds back a transmission mode information to transmitting terminal at least two Transmission Time Intervals.

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