CN102237911A - Method and device for selecting antenna data sending modes - Google Patents

Abstract

The invention discloses a method and a device for selecting an antenna data transmission mode. In the above method, the transmitting end determines a data transmission mode suitable for the receiving end from space diversity cyclic delay diversity and space multiplexing cyclic delay diversity modes according to channel state information; and the transmitting end uses the determined data transmission mode to transmit data. According to the above-mentioned technical solution provided by the present invention, it is solved that due to the lack of a data transmission mode selection scheme in space diversity cyclic delay diversity and space multiplexing cyclic delay diversity in the related art, the data transmission mode cannot be flexibly selected according to system channel conditions as Space diversity cyclic delay diversity and space multiplexing cyclic delay diversity to transmit data. Increase the stability of the link and improve the throughput of the system.

Description

Method and device for selecting antenna data transmission mode

technical field

The present invention relates to the communication field, in particular to a method and device for selecting an antenna data transmission mode.

Background technique

Cyclic Delay Diversity (CDD for short) is a multi-antenna transmit diversity scheme commonly used in Orthogonal Frequency Division Multiplexing (OFDM for short), which transmits the same frequency on each physical antenna. domain data and perform different cyclic delays on the OFDM symbols in the time domain, so as to obtain the diversity gain in the frequency domain. The schematic diagram of the sending end is shown in Figure 1. After the source is channel coded and modulated, it is transformed into time-domain data by Inverse Fast Fourier Transform (IFFT for short), and the corresponding cycle delay δ _i of the corresponding physical antenna is used for the corresponding cycle. After the delay, add a cyclic prefix (Cyclic Prefix, CP for short) and send it out. Here, i=1, . . . , Tx, Tx is the number of physical antennas at the transmitting end, and δ ₁ is generally 0.

Multiple Input Multiple Output (Multiple Input Multiple Output, referred to as MIMO) is a communication system that arranges multiple antennas at the transmitting end and the receiving end respectively. It includes space diversity and space multiplexing. Cyclic delay diversity and MIMO are combined to form a technology with two technical advantages, which is called Multiple Input Multiple Output Cyclic Delay Diversity (MIMO+CDD). A schematic diagram of a transmitting end of MIMO cyclic delay diversity is shown in FIG. 2 . The system divides the antenna into M sub-arrays, and each sub-array performs cyclic delay diversity operation to form a virtual antenna. Multiple virtual antennas form a MIMO structure. Among them, the combination of spatial diversity and cyclic delay diversity is called spatial diversity cyclic delay diversity (Spatial Diversity Cyclic Delay Diversity, referred to as SD+CDD), for details, please refer to FIG. 3 . The combination of spatial multiplexing and cyclic delay diversity is called spatial multiplexing cyclic delay diversity (Spatial Multiplexing Cyclic Delay Diversity, referred to as SM+CDD), for details, see Figure 4.

In related technologies, space diversity cyclic delay diversity has relatively large diversity gain and relatively high signal-to-noise ratio, and high-order modulation and coding methods can be used to improve throughput; its coverage is relatively large. Space multiplexing cyclic delay diversity can transmit different symbols on different virtual antennas, and the throughput is generally relatively large, but the coverage is relatively small.

Wireless channels generally change with time, and sometimes it is better to use space diversity cyclic delay diversity, and sometimes it is better to use space multiplexing cyclic delay diversity. In order to improve link stability and system throughput, different data transmission modes need to be selected to adapt to the changing wireless channel environment.

Contents of the invention

In view of the lack of data transmission mode selection schemes in space diversity cyclic delay diversity and space multiplexing cyclic delay diversity in the related art, it is impossible to flexibly select the data transmission mode according to channel conditions to increase link stability and improve throughput. In the present invention, the main purpose of the present invention is to provide an improved antenna data transmission mode selection method and device, so as to solve at least one of the above-mentioned problems.

According to one aspect of the present invention, a method for selecting an antenna data transmission mode is provided.

The method for selecting an antenna data transmission mode according to the present invention includes: the transmitting end determines a data transmission mode suitable for the receiving end from the space diversity cyclic delay diversity SD+CDD and space multiplexing cyclic delay diversity SM+CDD modes according to the channel state information; and The sending end sends data using a determined data sending mode.

According to another aspect of the present invention, a device for selecting an antenna data transmission mode is provided.

The device for selecting the antenna data transmission mode according to the present invention includes: a determination module, which is used to determine the data suitable for the receiving end from the space diversity cyclic delay diversity SD+CDD mode or the space multiplexing cyclic delay diversity SM+CDD mode according to the channel state information a sending mode; and a sending module, configured to send data using a determined data sending mode.

Through the present invention, the transmitting end determines that the space diversity cyclic delay diversity (SD+CDD) mode or the space multiplexing cyclic delay diversity (SM+CDD) mode is a data transmission mode suitable for the receiving end according to the channel state information, and the above-mentioned suitable for the receiving end Data transmission mode transmits antenna data. It solves the problem that due to the lack of a data transmission mode selection scheme in space diversity cyclic delay diversity and space multiplexing cyclic delay diversity in the related art, it is impossible to flexibly select the data transmission mode as space diversity cyclic delay diversity and space multiplexing according to system channel conditions Cyclic delay diversity to transmit data. By using the above technical solution, the stability of the link is increased and the throughput of the system is improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a schematic structural diagram of a cyclic delay diversity (CDD) transmitter in the related art;

FIG. 2 is a schematic structural diagram of a spatial multiplexing (SM) transmitter in the related art;

FIG. 3 is a schematic structural diagram of a transmitting end combining SD and CDD in the related art;

FIG. 4 is a schematic structural diagram of a transmitting end combining SM and CDD in the related art;

5 is a flowchart of a method for selecting an antenna data transmission mode according to an embodiment of the present invention;

6 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 1 of the present invention;

7 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 2 of the present invention;

FIG. 8 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 3 of the present invention;

FIG. 9 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 4 of the present invention;

10 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 5 of the present invention;

FIG. 11 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 6 of the present invention;

FIG. 12 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 7 of the present invention;

FIG. 13 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 8 of the present invention;

FIG. 14 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 9 of the present invention;

15 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 10 of the present invention;

FIG. 16 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 11 of the present invention;

FIG. 17 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 12 of the present invention;

FIG. 18 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 13 of the present invention; and

Fig. 19 is a structural block diagram of an apparatus for selecting an antenna data transmission mode according to an embodiment of the present invention.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

The wireless communication system includes a sending end and a receiving end. The sending end in the embodiment of the present invention is a device for sending data or information, such as a macro base station, a micro base station, etc.; the receiving end is a terminal for receiving data or information. Such as mobile station, handheld device or data card, etc. Various embodiments of the present invention described below are implemented based on the wireless communication system.

Fig. 5 is a flowchart of a method for selecting an antenna data transmission mode according to an embodiment of the present invention. As shown in Figure 5, the selection method of the antenna data transmission mode includes:

S502: The transmitting end determines a data transmission mode suitable for the receiving end from the space diversity cyclic delay diversity (SD+CDD) mode and the space multiplexing cyclic delay diversity (SM+CDD) mode according to the channel state information; and

S504: The sending end sends data using a determined data sending mode.

In related technologies, due to the lack of schemes for selecting data transmission modes in space diversity cyclic delay diversity and space multiplexing cyclic delay diversity, it is impossible to flexibly select data transmission modes according to channel conditions to increase link stability and improve throughput. The above-mentioned embodiments are adopted The technical solution provided can flexibly select the data transmission mode as space diversity cyclic delay diversity or space multiplexing cyclic delay diversity to transmit data according to the system channel conditions, which increases the stability of the link and improves the throughput of the system.

In a wireless communication system, the channel state information may include but not limited to at least one of the following: CINR, BER, and spatial correlation information.

Among them, BER is the burst error rate or bit error rate, which is fed back by the receiving end to the sending end; or, the sending end can be obtained by calculation, and the specific calculation method is as follows:

In the judgment period, the total number of bursts sent by the sending end is M _total , and the corresponding number of bits is B _total bits. The number of bursts for the first retransmission of HARQ or AQR is M _rep , and the corresponding number of bits is B _rep bits, the corresponding burst error rate is BER=M _rep /M _total , or bit error rate BER=B _rep /B _total .

Wherein, the CINR includes the CINR in the space diversity beamforming data transmission mode or the CINR in the space multiplexing cyclic delay diversity data transmission mode. It can be calculated by the receiving end and fed back to the sending end, or it can be calculated by the sending end itself.

表示的，

的优选计算方式(即在选定的周期内根据一帧或多帧中信道相关矩阵R来计算条件数

)如下：Among them, the above spatial correlation is determined by the condition number of the channel correlation matrix

expressed,

The optimal calculation method of (that is, calculate the condition number according to the channel correlation matrix R in one or more frames in the selected period

)as follows:

(1) Initialize the previous channel correlation matrix R _Pre , and repeat step (2) within a selected period T until the period T ends.

和α_k≥0分别是特定载波集合中第k个子载波的信道系数矩阵和比例系数。h_ij(k)为第j根发送天线到i根接收天线间的第k个载波上的信道系数，j＝1，…，M，i＝1，…，N，M为实际物理发送天线数目或者虚拟天线数目，N为接收天线数目。(2) In the period T, according to the time sequence, calculate the channel correlation matrix on the carrier set used by the current user to calculate the channel correlation matrix in the frame structure: Here, _Nc represents the number of carriers contained in the above-mentioned carrier set,

and α _k ≥ 0 are the channel coefficient matrix and scale coefficient of the kth subcarrier in a specific carrier set, respectively. h _ij (k) is the channel coefficient on the kth carrier between the jth transmitting antenna and the i receiving antenna, j=1,..., M, i=1,..., N, M is the actual number of physical transmitting antennas Or the number of virtual antennas, N is the number of receiving antennas.

The previous channel correlation matrix is updated as R _Pre =ρR _Pre +(1-ρ)R, where ρ is a constant and 0≤ρ≤1.

，其中，f是一个关于相关性矩阵R_Pre的处理，优选地为：(3) Calculate the condition number of the previous channel correlation matrix:

, where f is a process on the correlation matrix R _Pre , preferably:

$f\left(R\right)=\frac{{\mathrm{\λ}}_{\min }\left(R_{\mathrm{Pre}}\right)}{\mathrm{tr}\left(R_{\mathrm{Pre}}\right)}$ or $f\left(R\right)=\frac{{\mathrm{\λ}}_{\min }\left(R_{\mathrm{Pre}}\right)}{{\mathrm{\λ}}_{\max }\left(R_{\mathrm{Pre}}\right)}$ Or f(R)=λ _min (R _Pre )

Among them, tr(A) represents the trace of the matrix A, and the superscript H represents the co-Er transposition of the matrix. λ _max (R _Pre ), λ _min (R _Pre ) are the maximum and minimum eigenvalues of the matrix R _Pre , respectively.

In a preferred implementation process, the above-mentioned channel state information includes CINR, and the above-mentioned sending end determines the data transmission mode suitable for the receiving end may further include the following processing:

(1) Determine the modulation order M _SDCDD , coding rate P _SDCDD , and coding repetition times _RSDCDD corresponding to the signal-to-noise ratio CINR _SDCDD in SD+CDD mode, and calculate the transmission rate V _SDCDD in SD+CDD mode = α _SDCDD × M _SDCDD ×P _SDCDD ÷R _SDCDD , where α _SDBF represents the multiple-input multiple-output coding rate of space diversity;

(2) Determine the modulation order M _SMCDD corresponding to the signal-to-noise ratio CINR _SMCDD in the SM+CDD mode, the coding rate P _SMCDD , and the number of coding repetitions R _SMCDD , and calculate the transmission rate V _SMCDD in the SM+CDD mode = α _SMCDD × M _SMCDD ×P _SMCDD ÷R _SMCDD , where α _SMCDD represents the multiple-input multiple-output coding rate for spatial multiplexing;

(3) Determine the larger of V _SDCDD and V _SMCDD , and determine that the data transmission mode corresponding to the larger one is suitable for the receiving end.

Through the above processing, the data transmission mode suitable for the receiving end can be determined according to the CINR, so that the data transmission mode can be flexibly selected as space diversity cyclic delay diversity or space multiplexing cyclic delay diversity to transmit data.

The above preferred implementation process is described below in conjunction with FIG. 6 .

Fig. 6 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 1 of the present invention. As shown in Figure 6, the sender processes all the receivers it serves as follows:

Step S602: Calculate the signal-to-noise ratio CINR _SDCDD of the receiving end under SD+CDD, and use it to look up the table to find the modulation order M _SDCDD , the coding rate P _SDCDD , and the number of repetitions corresponding to the modulation and coding method suitable for the signal-to-noise ratio R _SDCDD , and calculate the transmission rate V _SDCDD in the SD+CDD mode =α _SDCDD ×M _SDCDD ×P _SDCDD ÷R _SDCDD , where α _SDCDD represents the multiple-input multiple-output coding rate of space diversity;

Step S604: Calculate the CINR _SMCDD of the receiving end in the spatial multiplexing cyclic delay diversity data transmission mode, determine the modulation order M _SMCDD corresponding to the modulation and coding method, the coding rate P _SMCDD , and the number of coding repetitions R _SMCDD ; calculate the spatial multiplexing cycle Transmission rate V _SMCDD in delay diversity data transmission mode =α _SMCDD ×M _SMCDD ×P _SMCDD ÷R _SMCDD ; α _SMCDD is the MIMO coding rate during spatial multiplexing.

Step S606: compare V _SDCDD and V _SMCDD , if V _SDCDD ≥ V _SMCDD , select space diversity cyclic delay diversity (that is, determine that SD+CDD mode is a suitable data transmission mode), otherwise, select space multiplexing cyclic delay diversity mode ( That is, it is determined that the SM+CDD mode is an appropriate data transmission mode), and the data at the receiving end is transmitted using the selected data transmission mode.

In the preferred implementation process, the channel state information includes the information of the spatial correlation, and the spatial correlation is determined by the condition number of the channel correlation matrix It means that the above-mentioned sending end determining the data sending mode suitable for the receiving end may further include the following processing:

；(1) Calculation and acquisition

;

或者

，其中，tr(R)表示信道相关性矩阵R的迹，λ_max(R)和λ_min(R)分别表示R的最大特征值和最小特征值； or

or

, where tr(R) represents the trace of the channel correlation matrix R, and λ _max (R) and λ _min (R) represent the maximum and minimum eigenvalues of R, respectively;

其中，N_c表示用来计算信道相关性矩阵的载波集合上包含载波的数目，和α_k≥0分别是载波集合中第k个子载波的信道系数矩阵和比例系数，h_ij(k)为第j根发送天线到i根接收天线间的第k个载波上的信道系数，j＝1，…，M，i＝1，…，N，M为实际物理发送天线数目或者虚拟天线数目，N为接收天线数目。The above R can in turn be calculated by:

Among them, _Nc represents the number of carriers included in the carrier set used to calculate the channel correlation matrix, and α _k ≥ 0 are the channel coefficient matrix and proportional coefficient of the kth subcarrier in the carrier set, h _ij (k) is the channel coefficient on the kth carrier between the jth transmitting antenna and the i receiving antenna, j =1,...,M, i=1,...,N, M is the number of actual physical transmitting antennas or the number of virtual antennas, and N is the number of receiving antennas.

，因而计算的条件数

并不能很准确地表示空间相关性。Since the above calculation scheme only calculates the condition number based on the channel correlation matrix R in one frame

, thus computing the condition number

It does not represent spatial correlation very accurately.

。依照此种方式计算的条件数

可以较好地体现空间相关性。优选计算方式已经在上面提到，此处不再赘述。In practice, the condition number can be calculated in the preferred way mentioned above , that is, the condition number is calculated according to the channel correlation matrix R in multiple frames in the selected period

. The condition number computed in this way

Can better reflect the spatial correlation. The preferred calculation method has been mentioned above, and will not be repeated here.

大于条件数门限值

时，确定SM+CDD模式是适合于接收端的数据发送模式，否则，确定SD+CDD模式是适合于接收端的数据发送模式。(2) if

greater than the condition number threshold

, it is determined that the SM+CDD mode is a data transmission mode suitable for the receiving end; otherwise, it is determined that the SD+CDD mode is a data transmission mode suitable for the receiving end.

Through the above processing, the data transmission mode suitable for the receiving end can be determined according to the spatial correlation information, so that the data transmission mode can be flexibly selected as space diversity cyclic delay diversity or space multiplexing cyclic delay diversity to transmit data.

The above preferred implementation process will be described below with reference to FIG. 7 .

，对其服务的所有接收端进行如下处理：Fig. 7 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 2 of the present invention. As shown in Figure 7, the sender presets the threshold

, all receiving ends of its service are processed as follows:

Step S702: Initialize the previous channel correlation matrix R _Pre , and repeat step S704 within a selected period T until the period T ends.

这里，N_c表示载波集合上包含载波的数目，

和α_k≥0分别是特定载波集合中第k个子载波的信道系数矩阵和比例系数。h_ij(k)为第j根发送天线到i根接收天线间的第k个载波上的信道系数，j＝1，…，M，i＝1，…，N，M为实际物理发送天线数目或者虚拟天线数目，N为接收天线数目。Step S704: In the period T, according to the time sequence, calculate the channel correlation matrix on the carrier set used by the current user to calculate the channel correlation matrix in the frame structure:

Here, _Nc represents the number of carriers included in the carrier set,

and α _k ≥ 0 are the channel coefficient matrix and scale coefficient of the kth subcarrier in a specific carrier set, respectively. h _ij (k) is the channel coefficient on the kth carrier between the jth transmitting antenna and the i receiving antenna, j=1,..., M, i=1,..., N, M is the actual number of physical transmitting antennas Or the number of virtual antennas, N is the number of receiving antennas.

Here, the carrier set used to calculate the channel correlation matrix can be the time-frequency two-dimensional data subcarrier in the subchannel corresponding to the uplink data sent by the receiving end, or the subcarrier corresponding to the uplink pilot or the downlink data sent to the receiving end Data subcarriers in the corresponding subchannel, etc.

The previous channel correlation matrix is updated as R _Pre =ρR _Pre +(1-ρ)R, where ρ is a constant and 0≤ρ≤1.

Step S706: Calculate the condition number of the previous channel correlation matrix: , where f is a process on the correlation matrix R _Pre , preferably:

$f\left(R\right)=\frac{{\mathrm{\λ}}_{\min }\left(R_{\mathrm{Pre}}\right)}{\mathrm{tr}\left(R_{\mathrm{Pre}}\right)}$ or $f\left(R\right)=\frac{{\mathrm{\λ}}_{\min }\left(R_{\mathrm{Pre}}\right)}{{\mathrm{\λ}}_{\max }\left(R_{\mathrm{Pre}}\right)}$ Or f(R)=λ _min (R _Pre )

Among them, tr(A) represents the trace of the matrix A, and the superscript H represents the co-Er transposition of the matrix. λ _max (R _Pre ), λ _min (R _Pre ) are the maximum and minimum eigenvalues of the matrix R _Pre , respectively.

，选定空间复用循环延迟分集模式，否则，选择空间分集循环延迟分集模式。Step S708: if

, select the spatial multiplexing cyclic delay diversity mode, otherwise, select the spatial diversity cyclic delay diversity mode.

Step S710: Send the data at the receiving end using the selected data sending mode.

In a preferred implementation process, the above-mentioned channel state information includes BER, and the above-mentioned sending end determines the data transmission mode suitable for the receiving end may further include the following processing:

(1) The first judgment period T1 is set, and the unit of T1 is a frame;

(2) Obtain the BER fed back by the receiving end, or use hybrid automatic retransmission or automatic retransmission to calculate the BER in the current data transmission mode;

(3) If the BER is less than the error rate threshold BER ₀ , then determine that the SM+CDD mode is suitable for the data transmission mode of the receiving end, otherwise determine that the SD+CDD mode is suitable for the data transmission mode of the receiving end.

Through the above processing, the data transmission mode suitable for the receiving end can be determined according to the BER, so that the data transmission mode can be flexibly selected as space diversity cyclic delay diversity or space multiplexing cyclic delay diversity to transmit data.

The above preferred implementation process is described below in conjunction with FIG. 8 .

FIG. 8 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 3 of the present invention. As shown in Figure 8, the sending end presets the threshold value BER ₀ , and performs the following processing on all receiving ends served by it:

Step S802: In the decision period, obtain the BER fed back by the receiving end, or use HARQ or ARQ to calculate the BER in the current data transmission mode;

Step S804: If BER<BER ₀ , it is more optimal to select the spatial multiplexing cyclic delay diversity mode, otherwise it is more optimal to select the spatial diversity cyclic delay diversity mode.

Step S806: Send data by selecting a more optimal data sending mode.

In the preferred implementation process, the channel state information includes: BER and CINR, and the above-mentioned sending end determines that the data transmission mode suitable for the receiving end may further include the following processing:

(1) For the receiver using the SD+CDD mode, obtain the CINR in the SD+CDD mode, if the CINR is greater than the first SNR threshold SDCDD_TH ₀ , then determine that the SM+CDD mode is suitable for the data transmission mode of the receiver , otherwise, it is determined that the SD+CDD mode is a data transmission mode suitable for the receiving end.

(2) For the receiving end using the SM+CDD mode, obtain the BER fed back by the receiving end, or use hybrid automatic retransmission or automatic retransmission to calculate the BER in the current data transmission mode, if the BER is greater than the error rate threshold BER ₀ , it is determined that the SD+CDD mode is a data transmission mode suitable for the receiving end, otherwise, it is determined that the SM+CDD mode is a data transmission mode suitable for the receiving end.

Through the above processing, the data transmission mode suitable for the receiving end can be determined according to the CINR and BER, so that the data transmission mode can be flexibly selected as space diversity cyclic delay diversity and space multiplexing cyclic delay diversity to transmit data.

The above preferred implementation process is described below in conjunction with FIG. 9 .

FIG. 9 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 4 of the present invention. As shown in Figure 9, the sending end pre-sets the threshold value BER ₀ and SDBF_TH ₀ , and performs the following processing on all receiving ends it serves:

Step S902: For the receiving end using the space diversity cyclic delay diversity mode, obtain the CINR in the space diversity cyclic delay diversity mode, if CINR>SDBF_TH ₀ , determine that the space multiplexing cyclic delay diversity mode is better; otherwise, determine the space diversity cyclic delay diversity mode Delay diversity mode is better.

Step S904: For the receiving end using the spatial multiplexing cyclic delay diversity mode, obtain the BER fed back by the receiving end, or use HARQ or ARQ to calculate the BER in the current data transmission mode; if BER>BER ₀ , select the spatial diversity cyclic delay diversity mode is better, otherwise it is better to choose the spatial multiplexing cyclic delay diversity mode.

Step S906: Send data by selecting a more optimal data sending mode.

In a preferred implementation process, the channel state information includes the signal-to-noise ratio CINR, and the above-mentioned sending end determines that the data transmission mode suitable for the receiving end may further include the following processing:

(1) Set the first threshold interval [SDCDD_TH1, SDCDD_TH2], and calculate the CINR in SD+CDD mode for the receiving end using SD+CDD mode, if CINR<SDCDD_TH1, then determine that SD+CDD mode is suitable for the receiving end data Sending mode; if CINR>SDCDD_TH2, determine that SM+CDD mode is a data sending mode suitable for the receiving end; if CINR is in the first threshold interval, the sending end can perform any of the above-mentioned data to determine the data suitable for the receiving end The scheme of the transmission mode to determine whether SD+CDD mode or SM+CDD mode is suitable for the data transmission mode of the receiving end;

(2) Set the second threshold value interval [SMCDD_TH1, SMCDD_TH2], and calculate the CINR under the spatial multiplexing cyclic delay diversity mode for the receiver using the SM+CDD mode; if CINR<SMCDD_TH1, then determine that the SD+CDD mode is Suitable for the data transmission mode of the receiving end; if CINR>SMCDD_TH2, then determine that the SM+CDD mode is suitable for the data transmission mode of the receiving end; if CINR is located in the second threshold value interval, you can perform any of the above-mentioned The sending end determines a scheme suitable for the data sending mode of the receiving end to determine whether the SD+CDD mode or the SM+CDD mode is a data sending mode suitable for the receiving end.

The above preferred implementation process will be described below with reference to FIG. 10 .

Fig. 10 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 5 of the present invention. As shown in FIG. 10 , the sending end presets interval thresholds [SDCDD_TH1, SDCDD_TH2] and [SMCDD_TH1, SMCDD_TH2]. Here, 0≤SDCDD_TH1≤SDCDD_TH2, 0≤SMCDD_TH1≤SMCDD_TH2, all receivers served by it are processed as follows:

Step S1002: For the receiving end using the space diversity cyclic delay diversity mode, calculate the CINR in this mode, if CINR<SDCDD_TH1, then determine that the space diversity cyclic delay diversity mode is better; if CINR>SDCDD_TH2, then determine the space multiplexing cyclic delay The diversity mode is better; if SDCDD_TH1≤CINR≤SDCDD_TH2, execute any of the above-mentioned schemes for the transmitter to determine the data transmission mode suitable for the receiver (see Figures 5 to 8 for details) to determine the space diversity cycle Delay diversity mode or spatial multiplexing cyclic delay diversity mode is more preferable.

Step S1004: For the receiving end using the spatial multiplexing cyclic delay diversity mode; calculate the CINR in this mode, if CINR<SMCDD_TH1, determine that the spatial diversity cyclic delay diversity mode is better; if CINR>SMCDD_TH2, then determine the spatial multiplexing cycle The delay diversity mode is better; if SMCDD_TH1≤CINR≤SMCDD_TH2, then execute any of the above-mentioned schemes for the sending end to determine the data transmission mode suitable for the receiving end (see Figures 5 to 8 for details), and determine the space diversity cycle Delay diversity mode or spatial multiplexing cyclic delay diversity mode is more preferable.

Step S1006: Send data by selecting a better data sending mode.

In a preferred implementation process, the above-mentioned sending end determining the data sending mode suitable for the receiving end may further include the following processing:

(1) The second judgment period T2 is set, and the unit of T2 is frame;

(2) L judgment points are set in the second judgment cycle, wherein L is an integer greater than or equal to 1;

(3) At each decision point, the sending end of any of the above-mentioned items is determined to be suitable for the data transmission mode of the receiving end, so as to determine that SD+CDD mode or SM+CDD mode is a data transmission mode suitable for the receiving end, And count the number of times N1 that the SD+CDD mode is suitable for the data transmission mode of the receiving end, or count the number N2 of the number of times that the SM+CDD mode is suitable for the data transmission mode of the receiving end;

(4) If N1/L is greater than or equal to the predetermined value Tr, determine that the SD+CDD mode is a data transmission mode suitable for the receiving end, otherwise, determine that the SM+CDD mode is a data transmission mode suitable for the receiving end;

(5) If N2/L is greater than or equal to the predetermined value Tr, it is determined that the SM+CDD mode is a data transmission mode suitable for the receiving end, otherwise, it is determined that the SD+CDD mode is a data transmission mode suitable for the receiving end.

The above preferred implementation process will be described below with reference to FIG. 11 and FIG. 12 .

Fig. 11 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 6 of the present invention. As shown in Figure 11, the threshold value Tr and the judgment cycle T unit are set to be frames, and L judgment moments (judgment points) are set in the judgment cycle, and all receivers served by it are processed as follows:

Step S1102: Initialize SDCDD_NUM=0;

Step S1104: Execute any one of the above-mentioned schemes at the sending end to determine the data transmission mode suitable for the receiving end at each decision moment. If the space diversity cyclic delay diversity mode is better, then SDCDD_NUM=SDCDD_NUM+1;

Step S1106: Repeat step S1104 until the period ends or (SDCDD_NUM/L)≥Tr;

Step S1108: If (SDCDD_NUM/L)≥Tr, it is better to select the space diversity cyclic delay diversity mode, otherwise it is more optimal to select the space multiplexing cyclic delay diversity mode.

Step S1110: Select a better data sending mode to send data in the next period. Enter the next judgment cycle.

Fig. 12 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 7 of the present invention; as shown in Fig. 12 , the threshold value Tr and the judgment period T unit are set to be frames; L judgments are set in the judgment period At time (judgment point), all receiving ends of its service are processed as follows:

Step S1202: Initialize SMCDD_NUM=0;

Step S1204: Execute any one of the above-mentioned schemes at the sending end to determine the data transmission mode suitable for the receiving end at each decision moment. If the spatial multiplexing cyclic delay diversity mode is better, then SMCDD_NUM=SMCDD_NUM+1;

Step S1206: Repeat step S1204 until the period ends or (SMCDD_NUM/L)≥Tr;

Step S1208: If (SMCDD_NUM/L)≥Tr, it is better to select the spatial multiplexing cyclic delay diversity mode, otherwise it is more optimal to select the spatial diversity cyclic delay diversity mode.

Step S1210: Send data by selecting a better data sending mode in the next period. Enter the next judgment cycle.

In a preferred implementation process, the above-mentioned sending end determining the data sending mode suitable for the receiving end may further include the following processing:

(1) The third judgment period T3 is set, and the unit of T3 is frame;

(2) In the third judgment period, the sending end judges the data sending rate trend according to the channel state information;

Preferably, the channel state information includes CINR, and step (2) may further include the following processing:

A. Set multiple decision points in the third decision period, obtain the CINR in the current data transmission mode at each decision point in turn, and count the number N _s of CINR ≥ CINR ₀ in the third decision period, and CINR ₀ is the second SNR threshold;

B. If N _s ≤ _{N 1} , it is determined that the trend of the data transmission rate is decreasing, and N ₁ is the threshold value of the first number; if N _s ≥ _{N 2} , it is determined that the trend of the data transmission rate is rising, and N ₂ is the second threshold The number of times threshold; if N ₁ <N _s <N ₂ , it is determined that the trend of the data sending rate is unchanged.

Preferably, the channel state information includes the error rate BER, and step (2) may further include the following processing:

A. Dividing the third judgment period into multiple small periods;

B. Obtain the BER fed back by the receiving end in each small cycle in turn, or use hybrid automatic retransmission or automatic retransmission to calculate the BER in the current data transmission mode;

C. Counting the number of times N _s of BER≤BER ₀ in the third judgment cycle, BER ₀ is the threshold value of the false transmission rate;

D. If N _s ≤ _{N 1} , it is determined that the trend of the data transmission rate is decreasing, and N ₁ is the threshold value of the first number; if N _s ≥ _{N 2} , it is determined that the trend of the data transmission rate is rising, and N ₂ is the second threshold The number of times threshold; if N ₁ <N _s <N ₂ , it is determined that the trend of the data sending rate is unchanged.

(3) According to the trend of the data transmission rate, it is determined that the SD+CDD mode or the SM+CDD mode is a data transmission mode suitable for the receiving end.

Preferably, step (3) can further include the following processing:

A. If the sending rate trend is rising, determine a mode corresponding to a data sending rate between the current data sending rate and the maximum sending rate is suitable for the data sending mode of the receiving end;

Preferably, a mode corresponding to the data transmission rate is determined between the current data transmission rate and the maximum transmission rate, and the mode corresponding to the data transmission rate can be obtained by querying the pre-configured rate table.

Wherein, the above rate table is a table pre-configured by the sender according to the following method: the transmission rates corresponding to different modulation and coding methods when using space diversity cyclic delay diversity and the transmission rates corresponding to different modulation and coding methods when using space multiplexing cyclic delay diversity The rates are sorted to form a table, and the direction in which the transmission rate increases is the direction of rate increase, and the direction in which the transmission rate decreases is the direction of rate decrease. Each row in the table may include a data transmission mode, a modulation and coding scheme, a transmission rate and a unique index ID (Index). An example is shown in Table 1, which is arranged in ascending order of sending rate in Table 1. The number of encoding repetitions R=1, α=1 for space diversity cyclic delay diversity, and α=2 for space multiplexing cyclic delay diversity. Modulation methods include quadrature phase shift keying (Quadrature Phase Shift Keying, referred to as QPSK), quadrature amplitude modulation (Quadrature Amplitude Modulation, referred to as QAM), 16QAM, 64QAM, coding rates include 1/2, 2/3, 3/4 , 5/6.

Table 1

Data sending mode Modulation and coding method Data transmission rate (bit/Hz) Index ID Space Diversity Cyclic Delay Diversity QPSK 1/2 1 1 Space Diversity Cyclic Delay Diversity QPSK 3/4 1.5 2 Space Diversity Cyclic Delay Diversity 16QAM 1/2 2 3 Spatial multiplexing cyclic delay diversity QPSK 1/2 2 4 Space Diversity Cyclic Delay Diversity 64QAM 1/2 3 5 Spatial multiplexing cyclic delay diversity QPSK 3/4 3 6 Space Diversity Cyclic Delay Diversity 64QAM 2/3 4 7 Spatial multiplexing cyclic delay diversity 16QAM 1/2 4 8 Space Diversity Cyclic Delay Diversity 64QAM 3/4 4.5 9 Space Diversity Cyclic Delay Diversity 64QAM 5/6 5 10 Spatial multiplexing cyclic delay diversity 64QAM 1/2 6 11 Spatial multiplexing cyclic delay diversity 64QAM 2/3 8 12 Spatial multiplexing cyclic delay diversity 64QAM 3/4 9 13 Spatial multiplexing cyclic delay diversity 64QAM 5/6 10 14

B. If the sending rate trend is declining, determine between the current data sending rate and the minimum sending rate that a mode corresponding to the data sending rate is suitable for the data sending mode of the receiving end;

Preferably, a mode corresponding to the data transmission rate is determined between the current data transmission rate and the minimum transmission rate, and the mode corresponding to the data transmission rate can also be obtained by querying a pre-configured rate table.

C. If the sending rate trend is constant, keep the current data sending mode unchanged.

The above preferred implementation process will be described below with reference to FIGS. 13 to 18 .

Fig. 13 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 8 of the present invention. Among them, one sender serves multiple receivers. The decision period N _T T is configured on the sending end. The unit of T is a frame, and N _T is the number of small periods in the decision period. The threshold value of the configured BER is BER ₀ , and the threshold values of statistics are N ₁ and N ₂ , which are positive integers, and N ₁ ≤ _{N 2} . Configure the rate table, as shown in Table 1 above. The sending end performs the following processing on each receiving end in each decision period N _T T to adjust the data transmission rate, and transmit data using the modulation and coding method and data transmission mode corresponding to the data transmission rate.

Step S1302: If it is adjusted for the first time, initialize ID=1, that is, select the space diversity cyclic delay diversity data transmission mode and the modulation and coding method as QPSK1/2 to transmit data, otherwise ID is the last adjusted value, i=1.

Step S1304: In the period from (i-1)T+1 to iT, count the total number of bursts sent by the sending end as M _total , the corresponding number of bits is B _total bits, and the first retransmitted burst of HARQ or AQR The number is M _rep , corresponding to the number of bits B _rep , then the corresponding bit error rate BER=B _rep /B _total .

Step S1306: i=i+1; if BER≤BER ₀ , N _s =N _s +1.

Step S1308: Repeat steps S1304 to S1306 until the decision period ends or N _s ≥ N ₂ .

Step S1310: If N _s ≥ N ₂ , judge that the sending rate trend of the receiving end is rising, ID=min(ID+1, 14); if N _s ≤ N ₁ , judge that it is decreasing, ID=max(1, ID-1); if N ₁ <N _s <N ₂ , keep the data transmission rate unchanged, that is, ID=ID.

Step S1312: Use the data sending mode corresponding to the ID selected in step S1310 to send data.

It should be noted that the method adopted in this embodiment can also be implemented with the burst error rate BER=M _rep /M _total .

Fig. 14 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 9 of the present invention. Wherein, one sending end serves multiple receiving ends, and the decision period N _T T is configured on the sending end, where the unit of T is a frame, and N _T is the number of small periods in the decision period. The threshold value of the configured BER is BER ₀ , and the threshold values of statistics are N ₁ and N ₂ , which are positive integers, and N ₁ ≤ _{N 2} . Configure the rate table, as shown in Table 1. The sending end performs the following processing on each receiving end in each decision period N _T T to adjust the data transmission rate, and transmit data using the modulation and coding method and data transmission mode corresponding to the data transmission rate.

Step S1402 to step S1404: the same as the above step S1302 to step S1304, and will not be repeated here.

Step S1406: i=i+1; if BER≥BER ₀ , N _s =N _s +1.

Step S1408: Repeat steps S1404 to S1406 until the decision period ends or N _s ≥ N ₂ .

Step S1410: If N _s ≥ N ₂ , judge that the transmission rate trend of the receiving end is declining, ID=max(1, ID-1); if N _s ≤ N ₁ , judge that it is rising, ID=min(ID+1 , 14); if N ₁ <N _s <N ₂ , keep the data transmission rate unchanged, ID=ID.

Step S1412: Use the data sending mode corresponding to the ID selected in step S1410 to send data.

It should be noted that the method adopted in this embodiment can also be implemented with the burst error rate BER=M _rep /M _total .

Fig. 15 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 10 of the present invention. Among them, one sender serves multiple receivers. The decision period N _T T is configured on the sending end. The unit of T is a frame, and N _T is the number of small periods in the decision period. The initial value of the configured BER is BER ₀ , and the threshold values of statistics are N ₁ and N ₂ , which are positive integers, and N ₁ ≤ _{N 2} . Configure the rate table, as shown in Table 1. The sending end performs the following processing on each receiving end in each decision period N _T T to adjust the data transmission rate, and transmit data using the modulation and coding method and data transmission mode corresponding to the data transmission rate.

Step S1502 to step S1504: the same as the above step S1302 to step S1304, and will not be repeated here.

Step S1506: if BER≤BER ₀ , N _s =N _s +1;

Step S1508: i=i+1; BER ₀ =BER.

Step S1510: Repeat steps S1504 to S1508 until the decision period ends or N _s ≥ _{N 2} .

Step S1512: If N _s ≥ N ₂ , judge that the transmission rate trend of the receiving end is rising, ID=min(ID+1, 14); if N _s ≤ N ₁ , judge that it is declining, ID=max(1, ID-1); if N ₁ <N _s <N ₂ , keep the data transmission rate unchanged, ID=ID.

Step S1514: Use the data sending mode corresponding to the ID selected in step S1512 to send data.

It should be noted that the method adopted in this embodiment can also be implemented with the burst error rate BER=M _rep /M _total .

Fig. 16 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 11 of the present invention. Among them, one sender serves multiple receivers. The decision period N _T T is configured on the sending end. The unit of T is a frame, and N _T is the number of small periods in the decision period. Configure the threshold value of CINR as CINR ₀ , and the threshold values of statistics as N ₁ and N ₂ , which are positive integers, and N ₁ ≤ _{N 2} . Configure the rate table, as shown in Table 1. The sending end performs the following processing on each receiving end in each decision period N _T T to adjust the data transmission rate, and transmit data using the modulation and coding method and data transmission mode corresponding to the data transmission rate.

Step S1602: If it is the first adjustment, initialize ID=1, that is, select the space diversity cyclic delay diversity data transmission mode and the modulation and coding method as QPSK1/2 to transmit data, otherwise the ID is the last adjusted value. , i=1.

Step S1604: at the decision time iT, obtain the CINR in the current data transmission mode.

Step S1606: i=i+1; if CINR≥CINR ₀ , N _s =N _s +1.

Step S1608: Repeat steps S1604 to S1606 until the decision period ends or N _s ≥ _{N 2} .

Step S1610: If N _s ≥ N ₂ , judge that the transmission rate trend of the receiving end is rising, ID=min(ID+1, 14); if N _s ≤ N ₁ , judge that it is declining, ID=max(1, ID-1); if N ₁ <N _s <N ₂ , keep the data transmission rate unchanged, ID=ID.

Step S1612: Send data using the data sending mode corresponding to the ID selected in step S1610.

Fig. 17 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 12 of the present invention. Among them, one sender serves multiple receivers. The decision period N _T T is configured on the sending end. The unit of T is a frame, and N _T is the number of small periods in the decision period. Configure the threshold value of CINR as CINR ₀ , and the threshold values of statistics as N ₁ and N ₂ , which are positive integers, and N ₁ ≤ _{N 2} . Configure the rate table, as shown in Table 1. The sending end performs the following processing on each receiving end in each decision period N _T T to adjust the data transmission rate, and transmit data using the modulation and coding method and data transmission mode corresponding to the data transmission rate.

Step S1702 to step S1704: the same as the above step S1602 to step S1604, and will not be repeated here.

Step S1706: i=i+1; if CINR≤CINR ₀ , N _s =N _s +1.

Step S1708: Repeat steps S1704 to S1706 until the decision period ends or N _s ≥ _{N 2} .

Step S1710: If N _s ≥ N ₂ , judge that the transmission rate trend of the receiving end is decreasing, ID=max(1, ID-1); if N _s ≤ N ₁ , judge that it is rising, ID=min(ID+ 1, 14); if N ₁ <N _s <N ₂ , keep the data transmission rate unchanged, ID=ID.

Step S1712: Use the data sending mode corresponding to the ID selected in step S1710 to send data.

Fig. 18 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 13 of the present invention. Among them, one sender serves multiple receivers. The decision period N _T T is configured on the sending end. The unit of T is a frame, and N _T is the number of small periods in the decision period. The initial value of the configured CINR is CINR ₀ , and the threshold values of statistics are N ₁ and N ₂ , which are positive integers, and N ₁ ≤ _{N 2} . Configure the rate table, as shown in Table 1. The sending end performs the following processing on each receiving end in each decision period N _T T to adjust the data transmission rate, and transmit data using the modulation and coding method and data transmission mode corresponding to the data transmission rate.

Step S1802 to step S1804: the same as the above step S1602 to step S1604, and will not be repeated here.

Step S1806: If CINR≥CINR ₀ , N _s =N _s +1.

Step S1808: i=i+1; CINR ₀ =CINR.

Step S1810: Repeat steps S1804 to S1808 until the decision period ends or N _s ≥ _{N 2} .

Step S1812: If N _s ≥ N ₂ , judge that the transmission rate trend of the receiving end is rising, ID=min(ID+1, 14); if N _s ≤ N ₁ , judge that it is declining, ID=max(1, ID-1); if N ₁ <N _s <N ₂ , keep the data transmission rate unchanged, ID=ID.

Step S1814: Use the data sending mode corresponding to the ID selected in step S1812 to send data.

Fig. 19 is a structural block diagram of an apparatus for selecting an antenna data transmission mode according to an embodiment of the present invention. The device for selecting the antenna data transmission mode includes: a determination module 10 and a transmission module 12 .

The determining module 10 is used to determine according to the channel state information that the space diversity cyclic delay diversity (SD+CDD) mode or the space multiplexing cyclic delay diversity (SM+CDD) mode is a data transmission mode suitable for the receiving end;

The sending module 12 is configured to send antenna data using a determined data sending mode.

By using the above device, according to the system channel state information, the data transmission mode can be flexibly selected as space diversity cyclic delay diversity or space multiplexing cyclic delay diversity to transmit data. Thereby, the stability of the link is increased and the throughput of the system is improved.

In a wireless communication system, the channel state information may include but not limited to at least one of the following: CINR, BER, and spatial correlation information.

Among them, BER is the burst error rate or bit error rate, which is fed back by the receiving end to the sending end; or, the sending end can obtain it through calculation. The specific calculation method has been mentioned above and will not be repeated here.

表示的，

的计算过程以及优选计算过程也在上面已经提到，此处不再赘述。Among them, the above spatial correlation is determined by the condition number of the channel correlation matrix

expressed,

The calculation process of and the optimal calculation process have also been mentioned above, and will not be repeated here.

Preferably, the determining module 10 may further include: a first determining unit 100, configured to determine the modulation order M _SDCDD , the encoding rate _PSDCDD , and the encoding repetition number _RSDCDD corresponding to the signal-to-noise ratio CINR _SDCDD in SD+CDD mode; A calculation unit 102, used to calculate the transmission rate V _SDCDD in SD+CDD mode =α _SDCDD ×M _SDCDD ×P _SDCDD ÷ R _SDCDD , wherein, α _SDBF represents the multiple-input multiple-output coding rate of space diversity; the second determination unit 104, used to determine the modulation order M _SMCDD corresponding to the signal-to-noise ratio CINR _SMCDD in the SM+CDD mode, the coding rate P _SMCDD , and the number of coding repetitions R _SMCDD ; the second calculation unit 106 is used to calculate the SNR in the SM+CDD mode Sending rate V _SMCDD =α _SMCDD ×M _SMCDD ×P _SMCDD ÷ R _SMCDD , wherein, α _SMCDD represents the multiple-input multiple-output coding rate of spatial multiplexing; the third determination unit 108 is used to determine the ratio between V _SDCDD and V _SMCDD The larger one, and determine that the data transmission mode corresponding to the larger one is a data transmission mode suitable for the receiving end.

In the preferred implementation process, the working mode of the combination of the above-mentioned units can be referred to FIG. 6 , which will not be repeated here.

；第四确定单元112，用于

大于条件数门限值

时，确定SM+CDD模式是适合于接收端的数据发送模式，否则，确定SD+CDD模式是适合于接收端的数据发送模式。Preferably, the determination module 10 may further include: a calculation unit 110, used to calculate and obtain

; The fourth determination unit 112 is used for

greater than the condition number threshold

, it is determined that the SM+CDD mode is a data transmission mode suitable for the receiving end; otherwise, it is determined that the SD+CDD mode is a data transmission mode suitable for the receiving end.

In the preferred implementation process, the working mode of the combination of the above-mentioned units can be referred to FIG. 7 , which will not be repeated here.

Preferably, the determining module 10 may further include: a first setting unit 114, configured to set the first decision period T1, and the unit of T1 is a frame; a first obtaining unit 116, configured to obtain the BER fed back by the receiving end, or use a hybrid automatic Retransmission or automatic retransmission calculates the BER under the current data transmission mode; the fifth determination unit 118 is used to determine that the SM+CDD mode is a data transmission mode suitable for the receiving end when the BER is less than the error rate threshold value BER ₀ , Otherwise, it is determined that the SD+CDD mode is a data transmission mode suitable for the receiving end.

In the preferred implementation process, the working mode of the combination of the above-mentioned units can be referred to FIG. 8 , which will not be repeated here.

Preferably, the determining module 10 may further include: a second obtaining unit 120, configured to obtain the CINR in SD+CDD mode for a receiver using SD+CDD mode; a sixth determining unit 122, configured to obtain CINR when the CINR is greater than the first When the signal-to-noise ratio threshold value SDCDD_TH _{is 0} , it is determined that the SM+CDD mode is a data transmission mode suitable for the receiving end, otherwise, it is determined that the SD+CDD mode is a data transmission mode suitable for the receiving end; the third acquisition unit 124 is used to use The receiving end of the SM+CDD mode obtains the BER fed back by the receiving end, or uses hybrid automatic retransmission or automatic retransmission to calculate the BER in the current data transmission mode; the seventh determination unit 126 is used for when the BER is greater than the error rate gate When the limit value BER _{is 0} , it is determined that the SD+CDD mode is a data transmission mode suitable for the receiving end; otherwise, it is determined that the SM+CDD mode is a data transmission mode suitable for the receiving end.

In the preferred implementation process, the working mode of the combination of the above-mentioned units can be referred to FIG. 9 , which will not be repeated here.

In the preferred implementation process, CINR can also be used in combination with the above-mentioned determination schemes to determine whether the SD+CDD mode or the SM+CDD mode is a data transmission mode suitable for the receiving end (that is, a better data transmission mode). See Figure 10.

In the preferred implementation process, it is also possible to use a combination of the decision period and the above-mentioned determination schemes to determine whether the SD+CDD mode or the SM+CDD mode is a data transmission mode suitable for the receiving end (that is, a better data transmission mode). See Figure 11.

Preferably, the determining module 10 may further include: a second setting unit 128, configured to set a third judgment period T3, where the unit of T3 is a frame; a judging unit 130, configured to judge data according to channel state information within the third judgment period Transmission rate trend: the eighth determination unit 132 is configured to determine according to the data transmission rate trend that SD+CDD mode or SM+CDD mode is a data transmission mode suitable for the receiving end.

In the preferred implementation process, the working modes of the above-mentioned units combined with each other can be referred to FIG. 12 to FIG. 18 , and will not be repeated here.

In summary, through the above embodiments of the present invention, the antenna data transmission mode selection scheme provided can flexibly select the data transmission mode as space diversity according to system channel state information (for example, changes in channel conditions and application scenarios). Cyclic delay diversity or spatial multiplexing cyclic delay diversity to transmit data. Thereby, the stability of the link is increased and the throughput of the system is improved.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Optionally, they can be implemented with program codes executable by a computing device, so that they can be stored in a storage device and executed by a computing device, or they can be made into individual integrated circuit modules, or they can be integrated into Multiple modules or steps are fabricated into a single integrated circuit module to realize. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (19)

1. the system of selection of an antenna data sending mode is characterized in that, comprising:

Transmitting terminal determines to be suitable for the data transmission modes of receiving terminal from space diversity cyclic delay diversity SD+CDD and spatial reuse cyclic delay diversity SM+CDD pattern according to channel condition information; And

Described transmitting terminal uses described established data sending mode to send data.

2. method according to claim 1 is characterized in that described channel condition information comprises signal to noise ratio CINR, and described transmitting terminal determines that the data transmission modes that is suitable for receiving terminal comprises:

Determine the signal to noise ratio CINR under the described SD+CDD pattern _SDCDDCorresponding order of modulation M _SDCDD, code rate P _SDCDD, coding number of repetition R _SDCDD, and calculate transmission rate V under the described SD+CDD pattern _SDCDD=α _SDCDD* M _SDCDD* P _SDCDD÷ R _SDCDD, wherein, α _SDCDDThe multiple-input and multiple-output code rate of representation space diversity;

Determine the signal to noise ratio CINR under the described SM+CDD pattern _SMCDDCorresponding order of modulation M _SMCDD, code rate P _SMCDD, coding number of repetition R _SMCDD, and calculate transmission rate V under the described SM+CDD pattern _SMCDD=α _SMCDD* M _SMCDD* P _SMCDD÷ R _SMCDD, wherein, α _SMCDDThe multiple-input and multiple-output code rate that representation space is multiplexing;

At described V _SDCDDWith described V _SMCDDIn determine the greater, and determine that the data transmission modes of described the greater correspondence is the data transmission modes that is suitable for receiving terminal.

3. method according to claim 1 is characterized in that described channel condition information comprises the information of spatial coherence, and described spatial coherence is by the conditional number of channel correlation matrix

Expression, described transmitting terminal determines that the data transmission modes that is suitable for receiving terminal comprises:

Calculating is obtained described

If Greater than condition is counted threshold value

The time, determine that described SM+CDD pattern is the data transmission modes that is suitable for receiving terminal, otherwise, determine that described SD+CDD pattern is the data transmission modes that is suitable for receiving terminal.

4. method according to claim 3 is characterized in that, calculating is obtained described in the following manner

Perhaps

Perhaps

Wherein, the mark of described tr (R) expression channel relevancy matrix R, λ _Max(R) and λ _Min(R) represent eigenvalue of maximum and the minimal eigenvalue of described R respectively;

Described R calculates in the following manner:

Wherein, N _cExpression is used for comprising on the carrier set of calculating channel correlation matrix the number of carrier wave,

And α _k〉=0 is respectively the channel coefficient matrix and the proportionality coefficient of k subcarrier in the described carrier set, h _Ij(k) channel coefficients that is j root transmitting antenna to k the carrier wave between i root reception antenna, j=1 ..., M, i=1 ..., N, M are actual physics transmitting antenna number or virtual-antenna number, N is the reception antenna number.

5. method according to claim 1 is characterized in that, described channel condition information comprises a mistake rate BER, and described transmitting terminal determines that the data transmission modes that is suitable for receiving terminal comprises:

The first judgement period T 1 is set, and the unit of T1 is a frame;

Obtain the BER of described receiving terminal feedback, perhaps utilize to mix to retransmit or retransmit automatically the BER that calculates under the current data sending mode automatically;

If described BER sends out rate threshold value B ER less than mistake ₀, determine that then described SM+CDD pattern is the data transmission modes that is suitable for receiving terminal, otherwise determine that described SD+CDD pattern is the data transmission modes that is suitable for receiving terminal.

6. method according to claim 1 is characterized in that, described channel condition information comprises: BER and CINR, described transmitting terminal determine that the data transmission modes that is suitable for receiving terminal comprises:

To using the receiving terminal of described SD+CDD pattern, obtain the CINR under the described SD+CDD pattern, if CINR is greater than the first signal-noise ratio threshold value SDCDD_TH ₀, determine that then described SM+CDD pattern is the data transmission modes that is suitable for receiving terminal, otherwise, determine that described SD+CDD pattern is the data transmission modes that is suitable for receiving terminal;

To using the receiving terminal of described SM+CDD pattern, obtain the BER of this receiving terminal feedback, perhaps utilize and mix re-transmission automatically or retransmit the BER that calculates under the current data sending mode automatically, if BER is greater than a mistake rate threshold value B ER ₀, determine that described SD+CDD pattern is the data transmission modes that is suitable for receiving terminal, otherwise, determine that described SM+CDD pattern is the data transmission modes that is suitable for receiving terminal.

7. according to each described method in the claim 2 to 6, it is characterized in that described channel condition information comprises CINR, described transmitting terminal determines that the data transmission modes that is suitable for receiving terminal comprises:

The first thresholding interval [SDCDD_TH1 is set, SDCDD_TH2], to using the receiving terminal of described SD+CDD pattern, calculate the CINR under the described SD+CDD pattern, if CINR＜SDCDD_TH1 determines that then described SD+CDD pattern is the data transmission modes that is suitable for receiving terminal; If CINR＞SDCDD_TH2 determines that then described SM+CDD pattern is the data transmission modes that is suitable for receiving terminal; If described CINR is arranged in the described first thresholding interval, enforcement of rights requires each described step of determining to be suitable for the data transmission modes of receiving terminal of 2-6, determines that described SD+CDD pattern or described SM+CDD pattern are the data transmission modes that is suitable for receiving terminal;

The second threshold value interval [SMCDD_TH1, SMCDD_TH2] is set,, calculates the CINR under the described SM+CDD pattern using the receiving terminal of described SM+CDD pattern; If CINR＜SMCDD_TH1 determines that then described SD+CDD pattern is the data transmission modes that is suitable for receiving terminal; If CINR＞SMCDD_TH2 determines that then described SM+CDD pattern is the data transmission modes that is suitable for receiving terminal; If described CINR is arranged in the described second threshold value interval, then enforcement of rights requires each described transmitting terminal of 2-6 to determine to be suitable for the data transmission modes of receiving terminal, determines that described SD+CDD pattern or described SM+CDD pattern are the data transmission modes that is suitable for receiving terminal.

8. according to each described method in the claim 2 to 6, it is characterized in that described transmitting terminal determines that the data transmission modes that is suitable for receiving terminal comprises:

The second judgement period T 2 is set, and the unit of T2 is a frame;

In the described second judgement cycle L determination point is set, wherein, L is the integer more than or equal to 1;

Require each described step of determining to be suitable for the data transmission modes of receiving terminal of 2-6 in each described determination point enforcement of rights, determine that described SD+BF pattern or described SM+CDD pattern are the data transmission modes that is suitable for receiving terminal, and to add up described SD+BF pattern be the times N 1 that is suitable for the data transmission modes of receiving terminal, and perhaps adding up described SM+CDD pattern is the times N 2 that is suitable for the data transmission modes of receiving terminal;

If it is the data transmission modes that is suitable for receiving terminal that N1/L, determines described SD+BF pattern more than or equal to predetermined value Tr, otherwise, determine that described SM+CDD pattern is the data transmission modes that is suitable for receiving terminal;

If it is the data transmission modes that is suitable for receiving terminal that N2/L, determines described SM+CDD pattern more than or equal to predetermined value Tr, otherwise, determine that described SD+BF pattern is the data transmission modes that is suitable for receiving terminal.

9. method according to claim 7 is characterized in that, described transmitting terminal determines that the data transmission modes that is suitable for receiving terminal comprises:

The second judgement period T 2 is set, and the unit of T2 is a frame;

In the described second judgement cycle L determination point is set, wherein, L is the integer more than or equal to 1;

Require the 7 described steps of determining to be suitable for the data transmission modes of receiving terminal in each described determination point enforcement of rights, determine that described SD+CDD pattern or described SM+CDD pattern are the data transmission modes that is suitable for receiving terminal, and to add up described SD+CDD pattern be the times N 1 that is suitable for the data transmission modes of receiving terminal, and perhaps adding up described SM+CDD pattern is the times N 2 that is suitable for the data transmission modes of receiving terminal;

If it is the data transmission modes that is suitable for receiving terminal that N1/L, determines described SD+CDD pattern more than or equal to predetermined value Tr, otherwise, determine that described SM+CDD pattern is the data transmission modes that is suitable for receiving terminal;

If it is the data transmission modes that is suitable for receiving terminal that N2/L, determines described SM+CDD pattern more than or equal to predetermined value Tr, otherwise, determine that described SD+CDD pattern is the data transmission modes that is suitable for receiving terminal.

10. method according to claim 1 is characterized in that, described transmitting terminal determines that the data transmission modes that is suitable for receiving terminal comprises:

The 3rd judgement period T 3 is set, and the unit of T3 is a frame;

In described the 3rd judgement cycle, transmitting terminal is according to channel condition information judgment data transmission rate trend;

Determine that according to described data transmission rate trend described SD+CDD pattern or described SM+CDD pattern are the data transmission modes that is suitable for receiving terminal.

11. method according to claim 10 is characterized in that, described channel condition information comprises CINR, and transmitting terminal comprises according to channel condition information judgment data transmission rate trend:

In described the 3rd judgement cycle, a plurality of determination points are set, obtain CINR under current data sending mode at each described determination point successively, and add up CINR 〉=CINR in described the 3rd judgement cycle ₀Times N _s, described CINR ₀It is the second signal-noise ratio threshold value;

If N _s≤ N ₁, determine that then described data transmission rate trend is for descending described N ₁Be first number threshold value; If N _s〉=N ₂, determine that then described data transmission rate trend is for rising described N ₂Be second number threshold value; If N ₁＜N _s＜N ₂, determine that then described data transmission rate trend is constant.

12. method according to claim 10 is characterized in that, described channel condition information comprises BER, and transmitting terminal comprises according to channel condition information judgment data transmission rate trend:

Described the 3rd judgement cycle is divided into a plurality of minor cycles;

In each described minor cycle, obtain the BER of described receiving terminal feedback successively, perhaps utilize to mix to retransmit or retransmit automatically the BER that calculates under the current data sending mode automatically;

Add up BER≤BER in described the 3rd judgement cycle ₀Times N _s, described BER ₀For mistake is sent out the rate threshold value;

If N _s≤ N ₁, determine that then described data transmission rate trend is for descending described N ₁Be first number threshold value; If N _s〉=N ₂, determine that then described data transmission rate trend is for rising described N ₂Be second number threshold value; If N ₁＜N _s＜N ₂, determine that then described data transmission rate trend is constant.

13. according to each described method in the claim 10 to 12, it is characterized in that, determine that according to described data transmission rate trend described SD+CDD pattern or described SM+CDD pattern are that the data transmission modes that is suitable for receiving terminal comprises:

If described transmission rate trend rises, determine that between current data transmission rate and maximum transmission rate the pattern of a data transmission rate correspondence is the data transmission modes that is suitable for receiving terminal;

If described transmission rate trend descends, determine that between current data transmission rate and minimum transmission rate the pattern of a data transmission rate correspondence is the data transmission modes that is suitable for receiving terminal;

If described transmission rate trend is constant, keep current data transmission modes constant.

14. the choice device of an antenna data sending mode is characterized in that, comprising:

Determination module is used for determining to be suitable for from space diversity cyclic delay diversity SD+CDD pattern or spatial reuse cyclic delay diversity SM+CDD pattern according to channel condition information the data transmission modes of receiving terminal; And

Sending module is used to use described established data sending mode to send data.

15. device according to claim 14 is characterized in that, described determination module comprises:

First determining unit is used for the signal to noise ratio CINR under definite described SD+CDD pattern _SDCDDCorresponding order of modulation M _SDCDD, code rate P _SDCDD, coding number of repetition R _SDCDD

First computing unit is used to calculate the transmission rate V under the described SD+CDD pattern _SDCDD=α _SDCDD* M _SDCDD* P _SDCDD÷ R _SDCDD, wherein, α _SDBFThe multiple-input and multiple-output code rate of representation space diversity;

Second determining unit is used for the signal to noise ratio CINR under definite described SM+CDD pattern _SMCDDCorresponding order of modulation M _SMCDD, code rate P _SMCDD, coding number of repetition R _SMCDD

Second computing unit is used to calculate the transmission rate V under the described SM+CDD pattern _SMCDD=α _SMCDD* M _SMCDD* P _SMCDD÷ R _SMCDD, wherein, α _SMCDDThe multiple-input and multiple-output code rate that representation space is multiplexing;

The 3rd determining unit is used at described V _SDCDDWith described V _SMCDDIn determine the greater, and determine that the data transmission modes of described the greater correspondence is the data transmission modes that is suitable for receiving terminal.

16. device according to claim 14 is characterized in that, described determination module comprises:

Computing unit is used for calculating and obtains described

The 4th determining unit is used for

Greater than condition is counted threshold value

The time, determine that described SM+CDD pattern is the data transmission modes that is suitable for receiving terminal, otherwise, determine that described SD+CDD pattern is the data transmission modes that is suitable for receiving terminal.

17. device according to claim 14 is characterized in that, described determination module comprises:

First is provided with the unit, is used to be provided with the first judgement period T 1, and the unit of T1 is a frame;

First acquiring unit obtains the BER that described receiving terminal feeds back, and perhaps utilizes to mix to retransmit automatically or the automatic BER that calculates under the current data sending mode that retransmits;

The 5th determining unit is used for sending out rate threshold value B ER at described BER less than mistake ₀The time, determine that described SM+CDD pattern is the data transmission modes that is suitable for receiving terminal, otherwise determine that described SD+CDD pattern is the data transmission modes that is suitable for receiving terminal.

18. device according to claim 14 is characterized in that, described determination module comprises:

Second acquisition unit is used for obtaining the CINR under the described SD+CDD pattern to using the receiving terminal of described SD+CDD pattern;

The 6th determining unit is used at CINR greater than the first signal-noise ratio threshold value SDCDD_TH ₀The time, determine that described SM+CDD pattern is the data transmission modes that is suitable for receiving terminal, otherwise, determine described SDCDD_TH ₀Pattern is the data transmission modes that is suitable for receiving terminal;

The 3rd acquiring unit is used for using the receiving terminal of described SM+CDD pattern, obtains the BER of this receiving terminal feedback, perhaps utilizes to mix to retransmit or retransmit automatically the BER that calculates under the current data sending mode automatically;

The 7th determining unit is used for sending out rate threshold value B ER at BER greater than mistake ₀The time, determine that described SD+CDD pattern is the data transmission modes that is suitable for receiving terminal, otherwise, determine that described SM+CDD pattern is the data transmission modes that is suitable for receiving terminal.

19. device according to claim 14 is characterized in that, described determination module comprises:

Second is provided with the unit, is used to be provided with the 3rd judgement period T 3, and the unit of T3 is a frame;

Judging unit is used in described the 3rd judgement cycle, according to channel condition information judgment data transmission rate trend;

The 8th determining unit is used for determining that according to described data transmission rate trend described SD+CDD pattern or described SM+CDD pattern are the data transmission modes that is suitable for receiving terminal.

Images