CN101286777A - Multi-antenna-based signal sending method, sending device and receiving device thereof - Google Patents

Abstract

The present invention discloses a multi-antenna-based signal transmission method, which includes that the transmitting end obtains the information used to indicate the signal transmission mode fed back by the receiving end, and the transmitting end selects the corresponding antenna combination according to the information fed back by the receiving end; and An Alanouti space-time block coded signal is transmitted based on the selected antenna combination. Corresponding method The present invention also discloses a related multi-antenna signal sending device and receiving device. The invention can enable the receiving end to obtain better signal diversity gain in the process of receiving signals in the MIMO communication system.

Description

Multi-antenna-based signal sending method, sending device and receiving device thereof

technical field

The present invention relates to the technical field of mobile communication, in particular to a multi-antenna-based signal sending method, and related signal sending equipment and receiving equipment.

Background technique

According to the theory of mobile communication, the transmission bit rate of the system can be greatly improved by using a multi-antenna array at the transmitting end or the receiving end, or at both ends of the mobile communication system. Among them, MIMO (Multi-Input Multi-Output) technology is a signal transmission technology based on this theory. The specific working principle of MIMO refers to using multiple transmitting antennas and receiving antennas at the signal transmitting end and receiving end respectively. Signals are transmitted and received through multiple antennas at the transmitter and receiver, improving the quality of service (bit error rate or data rate) for each user.

Space-time block codes refer to the code words obtained by encoding signals based on space-time coding (STC, Space-Time Coding) technology. Space-time coding uses the space diversity (Diversity) gain provided by MIMO channels. In the curve, it is shown that a steeper slope can be obtained. According to different coding methods, STC technology can be divided into space-time grid coding (STTC, Space Time Trellis Coding), space-time topology coding (Space Time Turbo Coding), space-time block coding (STBC, Space TimeBlock Coding), difference Space-time block coding (DSTBC) and so on, among which the Alamouti space-time block code scheme is a simple and classic special case of STBC.

Currently, in MIMO communication systems based on multiple antennas, Alamouti space-time block codes are usually used to transmit signals to obtain better diversity gain. In the Alamouti space-time block code transmission technology, the transmitter generally uses two transmit antennas at the same time, and transmits signals according to the transmission mode shown in Figure 1, that is, one antenna transmits the signal a ₁ within one symbol period, and the other antenna Send signal-a ₂ ^* ; in another symbol period, one antenna sends signal a ₂ , and the other antenna sends signal a ₁ ^* , where signals a ₁ and a ₁ ^* and signals a ₂ and a ₂ ^* are conjugates of each other. The receiving end may use one or more receiving antennas to receive signals, so as to obtain the diversity (diversity) gain of the two transmitting antennas.

In order to obtain more diversity gain based on the Alamouti space-time block code transmission signal in the MIMO communication system, the prior art proposes that in the open loop (Open Loop) MIMO communication system, the transmitter uses 4 antennas for signal transmission at the same time, wherein The 4 transmit antennas can transmit signals based on the following MIMO modes:

${\mathrm{<span\; class="notranslate">\; A</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; =</span>\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}\end{array}\right]$

Each row element of the above matrix A' represents each symbol period in a transmission time interval (TTI), and the two symbol periods corresponding to two adjacent rows are continuous in the time domain or frequency domain, or at least two adjacent rows The channel conditions of the corresponding two symbol periods can be approximately regarded as unchanged.

The following introduces the concepts of TTI and symbol period respectively:

In order to combat channel fading, as well as transmission errors caused by channel interference and noise, the transmitter divides the data to be transmitted into multiple data packets (Block), performs channel coding and interleaving on the information bits in the same data packet, and then modulates Multiple symbols are transmitted through the channel, and the length of time required to transmit such a data packet determines the length of a TTI. The receiving end first receives all the symbols contained in the same data packet, and then performs deinterleaving and decoding. That is, a TTI refers to the time interval for transmitting such a data packet.

Each symbol in a data packet transmitted in a TTI can be distributed in different intervals in the time domain, or in different intervals in the frequency domain, or in different intervals on the two-dimensional planes of the time domain and the frequency domain. interval. A symbol period here refers to the interval occupied by a symbol transmitted through the channel in the time domain, or the interval occupied in the frequency domain, or the interval occupied in the two-dimensional plane of the time domain and the frequency domain. For example, a data packet uses 8 OFDM symbols in the time domain, and each OFDM symbol occupies 16 subcarriers in the frequency domain. Then, a symbol period refers to an interval on the two-dimensional plane of the time domain and the frequency domain. It is one subcarrier on one OFDM symbol in the time domain, and this data packet has 8×16=128 symbol periods in total.

When the above-mentioned A' is used to transmit signals, the number of receiving antennas at the receiving end only needs to be greater than 1, which can be 1, 2 or 4. The transmitting antennas are numbered as antennas 1, 2, 3, and 4. It can be seen that in this In the scheme, two symbol vectors [s _i s _i+1 ] and [-s _i+1 ^* s _i ^* ] are transmitted on antennas 1 and 2 respectively, and then two vectors are transmitted on antennas 3 and 4 respectively. symbolic vectors [s _i+2 s _i+3 ] and [-s _i+3 ^* s _i+2 ^* ]. Two symbol vectors [s _i s _i+1 ] and [-s _i+1 ^* s _i ^* ] transmitted on antennas 1 and 2 form a group of Alamouti space-time block codes, and on antenna 3, The two symbol vectors [s _i+2 s _i+3 ] and [-s _i+3 ^* s _i+2 ^* ] transmitted on 4 form another set of Alamouti space-time block codes.

However, when 4 antennas transmit signals based on this MIMO mode, two antennas 1 and 2 are always selected from the 4 transmitting antennas within two symbols, and their transmitted signals form a group of Alamouti space-time block codes; the following Two antennas 3 and 4 are selected from the 4 transmitting antennas within the two symbols, and their transmitted signals form another group of Alamouti space-time block codes. And choose 2 transmitting antennas from 4 transmitting antennas, there will be a total of 6 combinations, respectively select antenna 1, 2, select antenna 1, 3, select antenna 1, 4, select antenna 2, 3, select antenna 2, 4. Select antennas 3 and 4, but not every combination has the best transmission performance in these combinations, so the transmitting end randomly selects 2 antennas among the 4 transmitting antennas for Alamouti space-time block code transmission, receiving end may not be able to obtain the most ideal signal diversity gain.

In addition, the 4 transmit antennas can also transmit signals based on the following MIMO modes:

${\mathrm{<span\; class="notranslate">\; B</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; =</span>\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}\\ {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 4</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 6</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 5</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 7</span>}}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 5</span>}}^{<span\; class="notranslate">\; *</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 7</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 4</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 6</span>}}^{<span\; class="notranslate">\; *</span>}\\ {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 8</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 10</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 11</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 9</span>}}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 9</span>}}^{<span\; class="notranslate">\; *</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 11</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 8</span>}}^{<span\; class="notranslate">\; *</span>}\end{array}\right]$

Each row element of the above matrix represents each symbol period in a TTI, and the number of receiving antennas at the receiving end only needs to be greater than 2, which can be 2 or 4, and the transmitting antennas are numbered as antennas 1, 2, 3, 4, which can be It can be seen that in this scheme, the transmitted signals of antennas 1 and 2 form a group of Alamouti space-time block codes in two symbol periods, and the transmitted signals of antennas 3 and 4 form another group of Alamouti space-time block codes; the next two In one symbol period, the transmitted signals of antennas 1 and 3 form a set of Alamouti space-time block codes, and the transmitted signals of antennas 2 and 4 form another set of Alamouti space-time block codes; in the next two symbol periods, antenna 1 , 4 transmit signals form a set of Alamouti space-time block codes, and the transmit signals of antennas 2 and 3 form another set of Alamouti space-time block codes. However, at present, the four antennas at the transmitting end always alternately use the above three combinations for signal transmission, but not every combination of these combinations has the best transmission performance, so the transmitting end alternately uses the above three combinations for signal transmission. The receiving end may not be able to obtain the most ideal signal diversity gain.

Contents of the invention

The embodiment of the present invention proposes a multi-antenna-based signal transmission method, so that the transmitting end performs signal transmission according to the instruction of the receiving end, so that the receiving end can obtain better signal diversity gain.

Embodiments of the present invention also correspondingly propose a multi-antenna-based signal sending device and a signal receiving device thereof.

The embodiment of the present invention proposes a signal transmission method based on multiple antennas, including the steps: the transmitting end obtains the information used to indicate the signal transmission mode fed back by the receiving end, and the transmitting end selects the corresponding antenna combination according to the information fed back by the receiving end ; and transmitting an Alamouti space-time block coded signal based on the selected antenna combination.

Preferably, the information used to indicate the signal transmission mode is: one type of transmission mode information in each multiple-input multiple-output transmission mode agreed between the transmitting end and the receiving end.

Preferably, the information used to indicate the signal transmission mode is: antenna combination information.

The embodiment of the present invention also proposes a multi-antenna-based signal transmission device, including an information acquisition unit, used to obtain information indicating the signal transmission mode fed back by the receiving end; mode information for selecting a corresponding antenna combination; and a signal sending unit for sending an Alamouti space-time block code signal based on the antenna combination selected by the antenna selection unit.

The embodiment of the present invention also proposes a multi-antenna-based signal receiving device, including a feedback information determination unit for determining the information used to indicate the signal transmission mode fed back to the transmitter; an information feedback unit for feeding back the feedback information determination unit The determined signal sending mode information is fed back to the transmitting end.

The embodiment of the present invention makes full use of the characteristics that the communication channel remains basically unchanged within a TTI, and proposes that in the case of signal transmission based on Alamouti space-time block codes in a MIMO wireless communication system, the receiving end can be configured within each TTI or within each TTI. Multiple TTIs feed back to the transmitting end the signal transmission mode information that can obtain better reception performance when transmitting signals based on Alamouti space-time block codes, so that the transmitting end selects the corresponding transmitting antenna according to the signal transmission mode fed back by the receiving end, and based on the selected The transmitting antenna combination is used to transmit the Alamouti space-time block code signal. Based on this processing method, the receiving end can obtain better signal diversity gain in the process of receiving the signal.

Description of drawings

In order to make the implementation process of the present invention and the corresponding beneficial effects that can be achieved more clear, the specific implementation process of the technical solution of the present invention will be described in detail below in conjunction with each accompanying drawing. In each accompanying drawing:

FIG. 1 is a schematic diagram of a transmission mode of a transmitting terminal transmitting a signal based on the Alamouti space-time block code transmission technology in an existing MIMO communication system;

FIG. 2 is a schematic diagram of a MIMO wireless communication system with a space-time architecture using multiple antenna arrays at both the transmitting end and the receiving end;

3 is a flow chart of an embodiment of the multi-antenna-based signal transmission method of the present invention;

FIG. 4 is a structural block diagram of an embodiment of a multi-antenna-based signal sending device and a signal receiving device according to the present invention.

Detailed ways

In a mobile communication system, usually when a data packet (data block) containing multiple symbols is transmitted within a transmission time interval (TTI, Transmission Time Interval), it can be determined that the duration of the TTI is short enough, that is to say, in The basic situation of the channel within a TTI will remain unchanged, with a constant channel matrix H. The technical solution of the present invention makes full use of this feature of the communication system, so that the receiving end can obtain better receiving performance when feeding back a signal based on the Alamouti space-time block code to the transmitting end within each TTI or within multiple TTIs Signal transmission mode information, so that the transmitting end selects the corresponding transmitting antenna according to the signal transmission mode information fed back by the receiving end, and performs Alamouti space-time block code signal transmission based on the selected transmitting antenna combination. Based on this processing method, the receiving end will be in the A better signal diversity gain is obtained during signal reception.

Please refer to FIG. 2 , which shows a MIMO wireless communication system with a space-time architecture using multiple antenna arrays at both the transmitting end and the receiving end, where a signal stream at the transmitting end can be divided into n uncorrelated symbol subsequences, Each subsequence is transmitted by one of the n transmit antennas. After the n subsequences are transmitted through a channel with a channel matrix H, they can be received by n receiving antennas at the receiving end. In the communication system, the number n of transmitting antennas at the transmitting end is at least 2, and the number of receiving antennas at the receiving end is at least n at the number of transmitting antennas at the transmitting end.

Please refer to FIG. 3 , which is a flow chart of an embodiment of the multi-antenna-based signal transmission method of the present invention. First, the transmitting end obtains the information used to indicate the signal transmission mode fed back by the receiving end. Usually, the transmitting end is based on the obtained signal transmission mode information. When the Alamouti space-time block code transmits the signal, the receiving end can obtain better receiving performance (step 10); the transmitting end selects the corresponding antenna combination among the plurality of antennas configured according to the signal transmission mode information fed back by the receiving end (step 10). 20); then the transmitting end sends the Alamouti space-time block coded signal based on the selected antenna combination (step 30).

The information used to indicate the signal transmission mode that the receiving end feeds back to the transmitting end may be a MIMO transmission mode information that enables the receiving end to obtain better receiving performance among the various MIMO transmission modes agreed by the transmitting end and the receiving end; Enables the receiving end to obtain transmit antenna combination information with better receiving performance.

If the transmitting end and the receiving end have agreed on each MIMO transmission mode, a mark can be assigned to each agreed MIMO transmission mode, and the receiving end will determine the MIMO transmission mode that can obtain better reception performance, and then set the determined MIMO transmission mode The flag is fed back to the transmitting end, and the transmitting end can know which MIMO transmission mode to use for Alamouti space-time block code signal transmission according to the MIMO transmission mode flag fed back by the receiving end. The process of determining the MIMO transmission mode flag to be fed back to the transmitting end may be implemented by, but not limited to, the following methods:

The receiving end first calculates the information transmission throughput that can be obtained when the Alamouti space-time block code signal is transmitted using each agreed MIMO transmission mode, and the receiving end calculates the signal transmission time based on the Alamouti space-time block code according to each MIMO transmission mode , the information transmission throughput that can be obtained by the receiving end is a known technology, and will not be described in detail here; according to the calculation results, the receiving end uses the tag information corresponding to the MIMO transmission mode with the largest information transmission throughput as the signal transmission mode information to be fed back to the transmitting end .

In order to enable the receiving end to obtain better diversity gain performance in the process of receiving signals, it can be considered that in each TTI, the receiving end feeds back the signal transmission mode information to the transmitting end respectively; of course, the embodiment of the present invention can also use channel gradient here characteristics, the receiver is required to feed back the signal transmission mode information to the transmitter within at least two TTIs, that is, the receiver can only feed back the signal transmission mode information to the transmitter within every few TTIs, so that the above-mentioned better diversity can be obtained The additional overhead required on the basis of gaining performance becomes smaller.

According to the implementation principle of the embodiment of the present invention, a specific example can consider that in an open-loop (OpenLoop) MIMO communication system, when the transmitting end uses 4 transmitting antennas for signal transmission at the same time, the MIMO transmission mode based on it is:

${\mathrm{<span\; class="notranslate">\; A</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; =</span>\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}\end{array}\right]$

Amended to become: A1'(i), i=1, 2, ..., 6, which are respectively:

$\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\end{array}\right]<span\; class="notranslate">\; ,</span>\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\end{array}\right]<span\; class="notranslate">\; ,</span>\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}\end{array}\right]<span\; class="notranslate">\; ,</span>$

$\left[\begin{array}{cccc}\mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\end{array}\right]<span\; class="notranslate">\; ,</span>\left[\begin{array}{cccc}\mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}\end{array}\right]<span\; class="notranslate">\; ,</span>\left[\begin{array}{cccc}\mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}\end{array}\right]<span\; class="notranslate">\; ;</span>$

The receiving end feeds back to the transmitting end once in each TTI, or in every few TTIs: decide to use which MIMO transmission mode in A1′(i), i=1, 2, ..., 6 (determined The MIMO transmission mode used can enable the receiving end to obtain better receiving performance), since the transmitting end and the receiving end can agree on these supported MIMO transmission modes in advance, so the adopted MIMO transmission mode mark i can be directly fed back, and then the transmitting end According to the MIMO transmission mode flag i fed back by the receiving end, the corresponding MIMO transmission mode is selected to transmit the Alamouti space-time block code signal.

Or modify the above-mentioned existing MIMO transmission mode A' to: A'1(m), m=1, 2, 3, respectively:

$\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}\end{array}\right]<span\; class="notranslate">\; ,</span>\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}\end{array}\right]<span\; class="notranslate">\; ,</span>\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\end{array}\right]$

The receiving end feeds back to the transmitting end in every TTI or every few TTIs: decide to use which MIMO transmission mode among A'1(m), m=1, 2, and 3 (the MIMO transmission mode decided to use The transmission mode can enable the receiving end to obtain better receiving performance), the receiving end can directly feed back the adopted MIMO transmission mode mark i to the transmitting end, and then the transmitting end selects the corresponding MIMO transmission mode mark i according to the MIMO transmission mode mark i fed back by the receiving end mode for Alamouti space-time block code signaling. The adopted MIMO transmission mode information is fed back once every few TTIs, which can reduce the amount of feedback information required and save overhead;

According to the implementation principle of the embodiment of the present invention, another specific example can consider that in an open-loop (OpenLoop) MIMO communication system, when the transmitting end uses 4 transmitting antennas for signal transmission at the same time, the MIMO transmission mode based on it is:

${\mathrm{<span\; class="notranslate">\; B</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; =</span>\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}\\ {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 4</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 6</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 5</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 7</span>}}\\ {<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 5</span>}}^{<span\; class="notranslate">\; *</span>}& {<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 7</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 4</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 6</span>}}^{<span\; class="notranslate">\; *</span>}\\ {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 8</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 10</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 11</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 9</span>}}\\ {<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 9</span>}}^{<span\; class="notranslate">\; *</span>}& {<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 11</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 8</span>}}^{<span\; class="notranslate">\; *</span>}\end{array}\right]$

Amended to become: B1'(k), k=1, 2, 3, which are respectively:

$\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}\end{array}\right]<span\; class="notranslate">\; ,</span>\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}\\ {<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}& {<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}\end{array}\right]<span\; class="notranslate">\; ,</span>\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}}^{<span\; class="notranslate">\; *</span>}& {<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}& {\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; *</span>}\end{array}\right]<span\; class="notranslate">\; ;</span>$

The receiving end feeds back to the transmitting end once in each TTI or every few TTIs: decide to use which MIMO transmission mode among B1'(k), k=1, 2, and 3 (the MIMO transmission mode determined to be used mode can enable the receiving end to obtain better receiving performance), the receiving end can directly feed back the adopted MIMO transmission mode mark k to the transmitting end, and then the transmitting end selects the corresponding MIMO transmission mode according to the MIMO transmission mode mark k fed back by the receiving end Perform Alamouti space-time block code signaling. The MIMO transmission mode information used is fed back once every few TTIs, which can reduce the amount of feedback information required and save overhead

Please refer to FIG. 4 , which is a structural block diagram of an embodiment of a multi-antenna-based signal sending device and a signal receiving device in the present invention, wherein the multi-antenna-based signal sending device 50 includes an information obtaining unit 501 for obtaining feedback from a receiving end. For indicating signal transmission mode information, usually when the transmitting end performs Alamouti space-time block code signal transmission according to the signal transmission mode information fed back by the receiving end, the receiving end can obtain better receiving performance; the antenna selection unit 502 is used to The signal transmission mode information obtained by the obtaining unit 501, selects the corresponding antenna combination, that is, selects the corresponding antenna for combination among the configured multiple antennas; and the signal transmission unit 503 is used to select the antenna based on the antenna selection unit 502 The Alamouti space-time block code signal is sent in combination. The information obtaining unit 501 may obtain the information indicating the signal transmission mode fed back by the receiving end once in each TTI, or may obtain the information indicating the signal transmission mode fed back by the receiving end once in at least two TTIs (ie The information used to indicate the signal transmission mode fed back by the receiving end once is obtained within multiple TTIs). The sending device here can be obtained by upgrading the existing multi-antenna base station equipment, and the above-mentioned newly added processing units can be implemented based on software programs or based on hardware facilities.

Correspondingly, the multi-antenna-based signal receiving device 60 includes a feedback information determining unit 601, configured to determine the information used to indicate the signal transmission mode fed back to the transmitting end, wherein the transmitting end performs Alamouti according to the signal transmission mode information fed back by the receiving end. When the space-time block code signal is sent, the receiving end can obtain better receiving performance; the information feedback unit 602 is used to feed back the signal transmission mode information determined by the feedback information determining unit 601 to the transmitting end.

The signal transmission mode information fed back by the receiving end to the transmitting end may be one of the transmission mode information in each MIMO transmission mode agreed by the transmitting end and the receiving end, or may be antenna combination information. Wherein when the feedback information is MIMO transmission mode information, the feedback information determination unit 601 further includes a throughput calculation subunit 6011, which is used to calculate the transmission time of the Alamouti space-time block code signal using each MIMO transmission mode agreed by the transmitter and the receiver. , the information transmission throughput that can be obtained respectively. When calculating and using each MIMO transmission mode to perform signal transmission based on the Alamouti space-time block code, the processing process of the information transmission throughput that can be obtained by the receiving end belongs to the known technology, and will not be elaborated here. and an information determination subunit 6012, configured to use the information corresponding to the MIMO transmission mode with the largest information transmission throughput as the transmission mode information to be fed back to the transmitter according to the calculation result of the throughput calculation subunit 6011. Here is just an example of a preferred implementation method for the feedback information determination unit 601 to determine the signal transmission mode information to be fed back to the transmitter, and other methods that can determine the signal transmission mode information to be fed back to the transmitter are not excluded. Method to realize. The feedback information determining unit 601 may determine the signal transmission mode information once in each TTI, and accordingly the information feedback unit 602 feeds back the signal transmission mode information to the transmitting end once in each TTI. In addition, the feedback information determination unit 601 can also determine the signal transmission mode information once in at least two TTIs, and accordingly the information feedback unit 602 feeds back the signal transmission mode information to the transmitting end once in at least two TTIs, here choosing to determine once every multiple TTIs The information of the signal transmission mode and the feedback to the transmitting end take into account the gradual change characteristics of the channel, so as to save the channel overhead occupied by the feedback information. Similarly, the receiving device here can also be obtained by upgrading the existing multi-antenna base station equipment, and the above-mentioned newly added processing units can be implemented based on software programs or based on hardware facilities.

To sum up, in the embodiment of the present invention, in the MIMO wireless communication system, in the process of signal transmission based on the Alamouti space-time block code, the process of feeding back the signal transmission mode information adopted by the receiving end to the transmitting end is added, wherein the transmitting When the terminal transmits the signal based on the Alamouti space-time block code according to the feedback signal transmission method, the receiving terminal can obtain better receiving performance, so that the transmitting terminal selects the corresponding transmitting antenna combination according to the signal transmission method information fed back by the receiving terminal to perform Alamouti space-time block coding. When the time block code signal is sent, the receiving end can obtain better diversity gain performance when receiving the signal based on multiple antennas. Correspondingly, in the embodiment of the present invention, the receiving end can feed back the signal transmission mode information to the transmitting end only once in multiple TTIs, so that the additional overhead of the transmission channel can be further reduced on the basis of better diversity gain performance.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (14)

1, a kind of signal transmission method based on multi-antenna, is characterized in that, comprises steps: The transmitting end obtains the information used to indicate the signal transmission mode fed back by the receiving end, The transmitting end selects a corresponding antenna combination according to the information fed back by the receiving end; and An Alamouti space-time block coded signal is transmitted based on the selected antenna combination. 2. The method according to claim 1, wherein the information used to indicate the transmission mode of the signal is: one type of transmission mode information among the MIMO transmission modes agreed between the transmitting end and the receiving end. 3. The method according to claim 2, wherein the receiving end determines the feedback transmission mode information specifically includes: The receiving end calculates the information transmission throughput that can be obtained respectively when using the agreed multiple-input multiple-output transmission modes to perform Alamouti space-time block code signal transmission; and The information corresponding to the transmission mode with the largest information transmission throughput is used as the transmission mode information fed back to the transmitter. 4. The method according to claim 2 or 3, wherein the receiving end feeds back the transmission mode information to the transmitting end within each transmission time interval. 5. The method according to claim 2 or 3, wherein the receiving end feeds back the transmission mode information to the transmitting end once within at least two transmission time intervals. 6. The method according to claim 1, wherein the information used to indicate the signal transmission mode is: antenna combination information. 7. A multi-antenna-based signal transmission device, characterized in that it comprises: an information obtaining unit, configured to obtain the information used to indicate the signal transmission mode fed back by the receiving end; An antenna selection unit, configured to select a corresponding antenna combination according to the transmission mode information obtained by the information obtaining unit; and A signal sending unit, configured to send an Alamouti space-time block code signal based on the antenna combination selected by the antenna selection unit. 8. The device according to claim 7, wherein the information obtaining unit obtains the signal transmission mode information fed back by the receiving end once in each transmission time interval. 9. The device according to claim 7, wherein the information obtaining unit obtains the signal transmission mode information fed back by the receiving end once within at least two transmission time intervals. 10. A multi-antenna-based signal receiving device, characterized in that it comprises: a feedback information determining unit, configured to determine the information used to indicate the signal transmission mode fed back to the transmitting end; The information feedback unit is configured to feed back the signal transmission mode information determined by the feedback information determination unit to the transmitting end. 11. The device according to claim 10, wherein the information used to indicate the transmission mode of the signal is: one type of transmission mode information among the MIMO transmission modes agreed between the transmitting end and the receiving end. 12. The device according to claim 11, wherein the feedback information determining unit specifically comprises: The throughput calculation subunit is used to calculate the information transmission throughput that can be obtained respectively when the Alamouti space-time block code signal is sent using each of the agreed multiple-input multiple-output transmission modes; and The information determination subunit is configured to use the information corresponding to the transmission mode with the largest information transmission throughput as the transmission mode information fed back to the transmitter according to the calculation result of the throughput calculation subunit. 13. The device according to claim 11 or 12, wherein the feedback information determination unit determines the transmission mode information once in each transmission time interval, and the information feedback unit feeds back the information to the transmitting end in each transmission time interval One transfer mode information. 14. The device according to claim 11 or 12, wherein the feedback information determination unit determines the transmission mode information once within at least two transmission time intervals, and the information feedback unit transmits to the The terminal feeds back the transmission mode information once.

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