WO2011134187A1 - Method and device for selecting antenna data transmission mode - Google Patents

Abstract

A method and device for selecting an antenna data transmission mode are disclosed by the present invention. In the method, a transmission terminal determines, according to channel state information, a data transmission mode adapted to a reception terminal from a spatial diversity cyclic delay diversity mode and a spatial multiplexing cyclic delay diversity mode (S502), and the transmission terminal transmits antenna data using the determined data transmission mode (S504). The technical scheme of the present invention solves the problem that the data transmission mode can not be selected according to the system channel condition due to the lack of the scheme for selecting the data transmission mode from spatial diversity cyclic delay diversity and spatial multiplexing cyclic delay diversity in the related technology, and selects an adapted data transmission mode agilely from the spatial diversity cyclic delay diversity mode and the spatial multiplexing cyclic delay diversity mode to transmit data, thereby the link stability is increased and the system throughput is improved.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and apparatus for selecting an antenna data transmission mode. BACKGROUND Cyclic Delay Diversity (CDD) is a multi-antenna transmit diversity scheme commonly used in Orthogonal Frequency Division Multiplexing (OFDM), which transmits the same on each physical antenna. The frequency domain data is subjected to different cyclic delays for the OFDM symbols in the time domain to obtain the frequency domain diversity gain. The schematic diagram of the transmitting end is shown in Figure 1. After the channel is coded and modulated, the source is subjected to Inverse Fast Fourier Transform (IFFT) to form i or data, and the corresponding cyclic cycle of the corresponding physical antenna is used to perform the corresponding cycle. After the delay, the cyclic prefix (Cyclic Prefix, CP for short) is sent out. Here, = 1, .. ·, Γχ , Γχ is the number of physical antennas at the transmitting end, which is generally 0. Multiple Input Multiple Output (MIMO) is a communication system in which multiple antennas are placed at the transmitting end and the receiving end respectively. It includes spatial diversity and spatial multiplexing. Cyclic delay diversity combined with multiple input multiple output forms a technique with two technical advantages, called Multiple Input Multiple Output Cyclic Delay Diversity (MIMO + CDD). One of the schematic diagrams of the transmitting end of a multi-input multi-output cyclic delay diversity is shown in FIG. 2 . The system divides the antenna into M sub-arrays, and each sub-array performs a cyclic delay diversity operation to form a virtual antenna. A MIMO structure is formed between the versatile virtual antennas. The combination of spatial diversity and cyclic delay diversity is called Spatial Diversity Cyclic Delay Diversity (SD + CDD). For details, see Figure 3. The combination of spatial multiplexing and cyclic delay diversity is called Spatial Multiplexing Cyclic Delay Diversity (SM + CDD ). For details, see Figure 4. In the related art, the diversity gain of the spatial diversity cyclic delay diversity is relatively large, the signal-to-noise ratio is generally high, and the high-order modulation coding method can be used to improve the throughput; the coverage is relatively large. Spatial multiplexing cyclic delay diversity can transmit different symbols on different virtual antennas, and the throughput is generally large, but the coverage is relatively small. Wireless channels are generally constantly changing over time, sometimes using spatial diversity cyclic delay diversity is better, and sometimes using spatial multiplexing cyclic delay diversity is better. 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. SUMMARY OF THE INVENTION In view of the related art, due to the lack of a scheme for selecting a data transmission mode in spatial diversity cyclic delay diversity and spatial multiplexing cyclic delay diversity, it is impossible to flexibly select a data transmission mode according to channel conditions to increase link stability and improve throughput. While the present invention has been made, it is a primary object of the present invention to provide an improved method and apparatus for selecting an antenna data transmission mode to solve at least one of the above problems. According to an aspect of the present invention, a method of selecting an antenna data transmission mode is provided. The selection method of the antenna data transmission mode according to the present invention includes: the transmission end channel state information is determined to be suitable for reception from the spatial diversity cyclic delay diversity (SD+CDD) and the spatial multiplexing cyclic delay diversity (SM+CDD) mode. The data transmission mode of the terminal; and the sender transmits the data using the determined data transmission mode. According to another aspect of the present invention, an apparatus for selecting an antenna data transmission mode is provided. The apparatus for selecting an antenna data transmission mode according to the present invention includes: a determining module, configured to determine, according to channel state information, from a spatial diversity cyclic delay diversity (SD+CDD) mode or a spatial multiplexing cyclic delay diversity (SM+CDD) mode a data transmission mode at the receiving end; and a transmitting module for transmitting data using the determined data transmission mode. Through the invention, the transmitting end channel state information determines the spatial diversity cyclic delay diversity (SD+

The CDD) mode or spatial multiplexing cyclic delay diversity (SM+CDD) mode is a data transmission mode suitable for the receiving end, and the antenna data is transmitted using the above-described data transmission mode suitable for the receiving end. The solution in the related art lacks the selection of the data transmission mode in the spatial diversity cyclic delay diversity and the spatial multiplexing cyclic delay diversity, and cannot flexibly select the data transmission mode as spatial diversity cyclic delay diversity and spatial multiplexing according to system channel conditions. Loop delay diversity to send data. With the above technical solution, the stability of the link is increased and the throughput of the system is improved. Other features and advantages of the invention will be set forth in the description which follows, and The objectives and other advantages of the invention will be realized and attained by the <RTI BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic structural diagram of a cyclic delay diversity (CDD) transmitting end in the related art; FIG. 2 is a schematic structural diagram of a spatial multiplexing (SM) transmitting end in the related art; FIG. 3 is a related art of SD and CDD. FIG. 4 is a schematic structural diagram of a transmitting end combining SM and CDD in the related art; FIG. 5 is a flowchart of a method for selecting an antenna data transmitting mode according to an embodiment of the present invention; FIG. 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 antenna data transmission 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; FIG. 10 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 5 of the present invention; 11 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 6 of the present invention; FIG. 12 is a seventh embodiment 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 method for selecting an antenna data transmission mode according to Embodiment 9 of the present invention; FIG. 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; A flowchart of a method for selecting an antenna data transmission mode according to Embodiment 12 of the present invention; 18 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 13 of the present invention; and FIG. 19 is a block diagram showing a configuration of an apparatus for selecting an antenna data transmission mode according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. The wireless communication system includes a transmitting end and a receiving end. The transmitting end in the embodiment of the present invention is a device for transmitting data or information, such as a macro base station, a micro base station, etc., and the receiving end is a type of terminal for receiving data or information. Such as mobile stations, handheld devices or data cards. The various embodiments of the present invention are described below as being implemented on the basis of the wireless communication system. FIG. 5 is a flowchart of a method of selecting an antenna data transmission mode according to an embodiment of the present invention. As shown in FIG. 5, the method for selecting the antenna data transmission mode includes:

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

S504: The transmitting end sends data by using a determined data transmission mode. In the related art, due to the lack of spatial diversity cyclic delay diversity and spatial multiplexing cyclic delay diversity, the data transmission mode is selected, and the data transmission mode cannot be flexibly selected according to channel conditions to increase link stability and improve throughput. The technical solution provided by the example can flexibly select the data transmission mode as spatial diversity cyclic delay diversity or spatial multiplexing cyclic delay diversity to transmit data, which increases the stability of the link and improves the throughput of the system. In the wireless communication system, the above channel state information may include, but is not limited to, at least one of the following: CINR, BER, spatial correlation information. Wherein, SR is a false burst rate or a bit error rate, which is fed back to the transmitting end by the receiving end; or, the transmitting end is obtained by calculation, and the specific calculation method is as follows: In the decision period, the burst count the number of the transmitting side is transmitted M _toM total number, corresponding to the number of bits is B bits, the number of HARQ burst or AQR first retransmission number is M _rep, the number of bits corresponding to bits B _REP , the corresponding error rate is BER = M _rep IM _total , or the bit error rate BER = B _rep IB _total . The CINR includes a CINR in a spatial diversity beamformed data transmission mode or a CINR in a spatial multiplexing cyclic delay diversity data transmission mode. It can be calculated by the receiving end and fed back to the sender, or it can be calculated by the sender itself. Wherein, the spatial correlation is represented by a condition number of the channel correlation matrix, that is, the condition number 51 is calculated according to the channel correlation matrix R in one or more frames in a selected period.

(1) Initializing the previous channel correlation matrix R _Pre , repeating step (2) in the selected period T until the end of the period T.

(2) Calculate the channel correlation matrix on the carrier set used by the current user in the frame structure to calculate the channel correlation matrix in the period T according to the chronological order: R = a _k H ^H (k, *H(k, , in this k=\, N _e represents the number of carriers included in the above carrier set

H(k) = and ≥ 0 are the Ath subcarriers in a specific carrier set, respectively

The channel coefficient matrix and the scale factor of the wave. The channel coefficient on the kth carrier between the antenna and the root receiving antenna, _/ = 1,... = 1,..., N , Μ is the actual number of physical transmitting antennas or the number of virtual antennas, ^ is the receiving antenna number. The previous channel correlation matrix is updated to R _Pre = pR _Pre + {\ - p)R , P is constant and 0 ≤ ≤ 1.

(3) Calculate the condition number of the previous channel correlation matrix: 3 = muscle, / is a The processing of the correlation matrix R _Pra is preferably

f(R _Pre ) = ^{A (} ^ ^P or U = H ^J , or U = ^(R

HR _P where tr( ) denotes the trace of the matrix and superscript H denotes the common transposition of the matrix. TM _χ ( , m _n (R _Pre ) are the maximum and minimum eigenvalues of the matrix R _Pre respectively. In a preferred implementation, the channel state information includes a CINR, and the transmitting end determines that the data transmission mode suitable for the receiving end may further include the following deal with:

(1) Determine the modulation order M coding rate Α _σσ∞ corresponding to the signal-to-noise ratio CINR in SD+CDD mode, and the number of coding repetitions

And calculate the transmission rate in SD+CDD mode

VsDCDD = "SDCDD ^ SDCDD ^XP SDCDD ^{÷ R} SDCDD, where the multi-input multi-output coding rate representing spatial diversity;

(2) Determine the modulation order M coding rate, the number of coding repetitions corresponding to the signal-to-noise ratio C/NR _{WCTm in} SM+CDD mode, and calculate the transmission rate in SM+CDD mode.

VsMCDD = (XSMCDD >< ^M SMCDD X ^P SMCDD ^{÷ R} SMCDD, where " _WCT5D represents the spatially multiplexed multiple input multiple output coding rate;

(3) Determine the larger one among V _s and V, and determine that the data transmission mode corresponding to the larger one 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, so that the data transmission mode can be flexibly selected to transmit data for spatial diversity cyclic delay diversity or spatial multiplexing cyclic delay diversity. The above preferred implementation process will be described below in conjunction with FIG. FIG. 6 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 1 of the present invention. As shown in Figure 6, the sender performs the following processing on all receivers of its service: Step S602: Calculate the signal-to-noise ratio C/NRs^^ of the receiving end under SD+CDD, and use it to check the table to find the modulation corresponding to the modulation and coding mode under the signal-to-noise ratio.

, encoding rate P _SDCDD , number of repetitions R _SDCDD , and calculating the transmission rate in SD+CDD mode

VsDCDD = (^SDCDD >< ^M SDCDD >< ^P SDCDD ^{÷ R} SDCDD ' where 3⁄4χ ^ denotes the multiple input multiple output coding rate of spatial diversity; Step S604: Calculate the receiving end in the spatial multiplexing cyclic delay diversity data transmission mode _C / NR WCT∞ determine which modulation and coding scheme corresponding to the modulation order M, the coding rate o ^, encoding the number of repetitions R _CTm; calculating spatial multiplexing cycle delay transmission rate VD under diversity data transmission mode ₌ a _D xM mcDD xP ÷ R ; _cOO is the MIMO coding rate when spatial multiplexing. Step S606: Compare ^ and ^^, such as V _S select spatial diversity cyclic delay diversity (ie, determine SD + CDD mode as a suitable data transmission mode;), otherwise, Selecting a spatial multiplexing cyclic delay diversity mode (ie, determining that the SM+CDD mode is a suitable data transmission mode), and transmitting the data of the receiving end in a selected data transmission mode. In a preferred implementation, the channel state information includes spatial correlation. The information, the spatial correlation is represented by the condition number 51 of the channel correlation matrix, and the above-mentioned transmitting end determines the data transmission mode suitable for the receiving end, and may further include the following deal with:

(1) Calculate the acquisition) or = AmCg) or = dish, where the trace representing the channel correlation matrix R, the dishes (R) and n (R) represent the maximum eigenvalue and the most 'j, eigenvalues of R, respectively;

₄ calculation: ϋ , where N _c represents

The number of carriers included in the set of carriers used to calculate the channel correlation matrix, H(k) and ≥ 0 are the first subcarriers in the carrier set respectively

The channel coefficient matrix and the scale factor, h (k) is the channel coefficient on the first carrier between the first transmit antenna and the i receive antenna, j = \, ", M, i = \, ", N, Μ is the actual The number of physical transmit antennas or the number of virtual antennas, which is the number of receive antennas. Since the above calculation scheme calculates the condition number based only on the channel correlation matrix R in one frame, the calculated condition number does not accurately represent the spatial correlation. In practice, the condition number can be calculated using the preferred method mentioned above, i.e., the condition number 91 is calculated from the channel correlation matrix R in the multiframe in the selected period. The condition 3⁄4 calculated in this way can better reflect the spatial correlation. The preferred calculation method has been mentioned above and will not be described here.

(2) If it is greater than the conditional threshold. When it is determined that the SM+CDD mode is suitable for the data transmission mode of 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 spatial correlation information can be determined to be suitable for the data transmission mode of the receiving end, so that the data transmission mode can be flexibly selected to be spatial diversity cyclic delay diversity or spatial multiplexing cyclic delay diversity to transmit data. The above preferred implementation process will be described below in conjunction with FIG. 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 Fig. 7, the transmitting end sets the threshold value 9i in advance. All the receiving ends of the service are processed as follows: Step S702: Initializing the previous channel correlation matrix R _Pre , repeating step S704 in the selected period T until the end of the period T. Step S704: In the period T, the time sequence is calculated, and the current user is used in the frame structure. Calculate the channel correlation matrix on the carrier set of the channel correlation matrix: R = ^ _k H ^H (k) * H(k) , k = \ where N _e represents the number of carriers included on the carrier set

H(k) = and ≥ 0 are the Ath subcarriers in a specific carrier set, respectively

The channel coefficient matrix and the scale factor of the wave. The channel coefficient on the kth carrier between the antenna and the root receiving antenna, _/ = 1,... = 1,..., N , Μ is the actual number of physical transmitting antennas or the number of virtual antennas, ^ is the receiving antenna number. Here, the carrier set used to calculate the channel correlation matrix may be a time-frequency two-dimensional data sub-carrier in a sub-channel corresponding to the uplink data, or a sub-carrier corresponding to the uplink pilot or downlink data sent to the receiving end. Data subcarriers in the corresponding subchannels, etc. The previous channel correlation matrix is updated to R _Pre = R _Pre +(l- )R , which is constant and 0 ≤ ≤1. Step S706: Calculate the condition number of the previous channel correlation matrix: 3 = f(R _Pre , where / is a process regarding the correlation matrix R^, preferably:

_/( D = ^^1 or _f( R _Pr J = ^ _Pr J or muscle

HR _P re) AnU where tr( ) denotes the trace of the matrix, and the superscript ^ denotes the common transposition of the matrix. Λ (R _Pr J, m _n (R _Pre ) are the maximum and minimum eigenvalues of the matrix R _Pre respectively. Step S708: If _{,, the} spatial multiplexing cyclic delay diversity mode is selected, otherwise, the spatial diversity cyclic delay diversity mode is selected. Step S710: Send the data of the receiving end in the selected data transmission mode. In a preferred implementation process, the channel state information includes an SR, and the foregoing sending end determines that the data is suitable. The data transmission mode at the receiving end may further include the following processing: (1) setting a first decision period T1, and the unit of T1 is a frame;

(2) Obtain the BER fed back by the receiving end, or calculate the BER in the current data transmission mode by using hybrid automatic retransmission or automatic retransmission; (3) if S£R is less than the false alarm rate threshold BER, then determine SM+ The 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 BER, so that the data transmission mode can be flexibly selected to transmit data for spatial diversity cyclic delay diversity or spatial multiplexing cyclic delay diversity. The above preferred implementation process will be described below in conjunction with FIG. 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 FIG. 8, the transmitting end presets the threshold value 3^, and performs the following processing on all receiving ends of the monthly service: Step S802: In the decision period, obtain the BER fed back by the receiving end, or use HARQ or ARQ. Calculate the BER in the current data transmission mode; Step SS04. If 杲< ΒΕΙ^, select the spatial multiplexing cyclic delay diversity mode is better, otherwise the spatial diversity cyclic delay diversity mode is better. Step S806: Send data by using a selected better data transmission mode. In the preferred implementation process, the channel state information includes: BER and CINR, and the foregoing sending end determines that the data sending mode suitable for the receiving end may further include the following processing:

(1) For the receiver using SD+CDD mode, obtain the CINR in SD+CDD mode if C/NR is greater than the first SNR threshold)) /)/) _ 7/. Then, it is determined that the SM+CDD mode is suitable for the data transmission mode of the receiving end, otherwise, it is determined that the SD+CDD mode is a data transmission mode suitable for the receiving end. (2) For the receiver using SM+CDD mode, obtain the S£: R feedback from the receiver, or calculate the BER in the current data transmission mode by using hybrid automatic retransmission or automatic retransmission, if S£R is greater than the error Rate threshold, determine that the SD+CDD mode is suitable for the data transmission mode of 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 the BER, so that the data transmission mode can be flexibly selected to transmit data for the spatial diversity cyclic delay diversity and the spatial multiplexing cyclic delay diversity. The above preferred implementation process will be described below in conjunction with FIG. 9 is a flow chart showing a method of selecting an antenna data transmission mode according to Embodiment 4 of the present invention. As shown, the transmit end 9 preset threshold BER ^ and SDBF _ΤΗ _0, all its receiving end that works to month treated as follows: Step S902: receiving end the spatial diversity cyclic delay diversity mode, to obtain The CINR in the spatial diversity cyclic delay diversity mode, if C/NR > SDBF _ ΤΗο , determines that the spatial multiplexing cyclic delay diversity mode is better; otherwise, it is better to determine the spatial diversity cyclic delay diversity mode. Step S904: Obtain a BER fed back by the receiving end, or use the HARQ or ARQ to calculate the SR in the current data sending mode, if the receiving end uses the spatial multiplexing cyclic delay diversity mode;

BER > BER^, select the spatial diversity cyclic delay diversity mode is better, otherwise choose the spatial multiplexing cycle delay diversity mode is better. Step S906: Send data by using a selected better data transmission mode. In a preferred implementation process, the channel state information includes a signal to noise ratio (C/NR), and the data transmitting mode determined by the transmitting end to be suitable for the receiving end may further include the following processing:

(1) Set the first threshold interval [SDCDD _ TH\, SDCDD _TH2], calculate the CINR in SD+CDD mode for the receiver using SD+CDD mode, and determine SD+CDD if CINR < SDCDD _ ΤΗ\ The mode is a data transmission mode suitable for the receiving end; if CINR > SDCDD_TH 2 , it is determined that the SM+CDD mode is a data transmitting mode suitable for the receiving end. If the C/NR is located in the first threshold interval, the transmitting end of any of the above mentioned ones may be determined to determine a data transmission mode suitable for the receiving end to determine that the SD+CDD mode or the SM+CDD mode is suitable for Data transmission mode at the receiving end;

(2) Set the second threshold interval [SMCDD _TH\, SMCDD _ΤΗ1\ for C/NR in spatial multiplexing cyclic delay diversity mode for the receiver using SM+CDD mode; if CINR < SMCDD _THl , then Determining that the SD+CDD mode is suitable for the data transmission mode of the receiving end; for example, CINR > SMCDD_TH2, determining that the SM+CDD mode is suitable for the data transmission mode of the receiving end; if the C/NR is located in the second threshold interval, The scheme in which the transmitting end of any of the above mentioned ones determines the data transmission mode suitable for the receiving end can be determined to determine that the SD+CDD mode or the SM+CDD mode is a data transmission mode suitable for the receiving end. The above preferred implementation process will be described below in conjunction with FIG. FIG. 10 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 5 of the present invention. As shown in Figure 10, the sender presets the interval threshold [SDCDD _TH\, SDCDD TH1] and

[SMCDD _ THI, SMCDD _ H2]. Here, 0 ≤ SDCDD _ TH\ ≤ SDCDD _ ΤΗ 2 , 0 < SMCDD _TH ≤ SMCDD _TH2 , and all receiving ends of the monthly service are processed as follows: Step S 1002: For the receiving end using the spatial diversity cyclic delay diversity mode Calculate the C/NR in this mode, such as CINR < SDCDD _Tm, then determine that the spatial diversity cyclic delay diversity mode is better; if CINR > SDCDD-TH2, then determine the spatial multiplexing cyclic delay diversity mode is better; for example, SDCDD _Tm ≤ CINR ≤ SDCDD — TH 2 , then the transmitter performing any of the above mentioned ones determines a scheme suitable for the data transmission mode of the receiving end (see FIG. 5 to FIG. 8 for details) to determine the spatial diversity cyclic delay diversity mode or space. The multiplexed cyclic delay diversity mode is better. Step S1004: For the receiving end using the spatial multiplexing cyclic delay diversity mode; calculating C/NR in the mode, such as CINR < SMCDD _ΤΗ\, determining that the spatial diversity cyclic delay diversity mode is better; for example, CINR > SMCDD _ΤΗ2, It is determined that the spatial multiplexing cyclic delay diversity mode is better; if SMCDD _ TH\ ≤ CINR ≤ SMCDD _ TH2 , then the transmitting end of any of the above mentioned ones is implemented. A scheme suitable for the data transmission mode of the receiving end (see FIG. 5 to FIG. 8 for details), and determining the spatial diversity cyclic delay diversity mode or the spatial multiplexing cyclic delay diversity mode is better. Step S1006: The data is transmitted in the selected better data transmission mode. In a preferred implementation process, the foregoing sending end determines that the data sending mode suitable for the receiving end may further include the following processing:

(1) setting a second decision period T2, the unit of T2 is a frame;

(2) setting L decision points in the second decision period, where L is an integer greater than or equal to 1;

(3) performing, at each decision point, the transmitting end of any of the above mentioned ones to determine a data transmission mode suitable for the receiving end, to determine that the SD+CDD mode or the SM+CDD mode is a data transmission mode suitable for the receiving end, And counting the SD+CDD mode is the number of times N1 suitable for the data transmission mode of the receiving end, or counting the number of times the SM+CDD mode is suitable for the data transmission mode of the receiving end N2;

(4) If N1/L is greater than or equal to the predetermined value Tr, 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;

(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 Figs. 11 and 12. 11 is a flow chart showing a method of selecting an antenna data transmission mode according to Embodiment 6 of the present invention. As shown in FIG. 11, the set threshold value 7 and the decision period Γ unit are frames, and a decision time (decision point) is set in the decision period, and all receiving ends of the service are processed as follows: Step S 1102: Initial SDCDD _NUM = 0; Step S1104: performing, at each decision time, the transmitting end of any of the above mentioned ones determines a scheme suitable for the data transmission mode of the receiving end, and if the spatial diversity cyclic delay diversity mode is better,

SDCDD _ NUM = SDCDD _ NUM + 1; Step S 1106: Step S 1104 is repeatedly executed until the end of the period or (SDCDD _ NUM IL) ≥ Tr; Step S 1108: If KSDCDD _NUM ID ≥ Tr, the spatial diversity cyclic delay diversity mode is selected to be better, otherwise the spatial multiplexing cyclic delay is selected. The diversity mode is better. Step S1110: The data is transmitted by selecting a better data transmission mode in the next cycle. Enter the next decision cycle. 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, setting a threshold value 7 and a decision period Γ unit is a frame; setting a decision timing in a decision period (Decision point), processing all the receiving ends of the service as follows: Step S1202: Initializing SMCDD_NUM = 0; Step S1204: Performing the transmitting end of any of the above mentioned at each decision time to determine that it is suitable for receiving The scheme of the data transmission mode of the end, if the spatial multiplexing cyclic delay diversity mode is better, then

SMCDD _ NUM = SMCDD _ NUM + 1; Step S 1206: Repeat step S 1204 until the end of the period or (SMCDD _NUM / L) ≥ Tr; Step S mH SMCDD _NUM ID ≥ Tr , select spatial multiplexing cyclic delay diversity mode Excellent, otherwise it is better to choose the spatial diversity cyclic delay diversity mode. Step S1210: Send data by selecting a better data transmission mode in the next cycle. Enter the next decision cycle. In a preferred implementation process, the foregoing sending end determines that the data sending mode suitable for the receiving end may further include the following processing:

(1) setting the third decision period Τ3, the unit of Τ3 is a frame;

(2) in the third decision period, the transmitting end determines the data transmission rate trend according to the channel state information; Preferably, the channel state information includes C/NR, and step (2) may further include the following processing:

A. Setting a plurality of decision points in the third decision period, obtaining CINR in the current data transmission mode at each decision point, and counting the number of CINR^CINR^ in the third decision period^, CINR^ is the second letter The noise ratio threshold; B, if N _s ≤ N, , the data transmission rate trend is determined to be decreasing, N is the first time threshold; if ≥ N ₂ , the data transmission rate trend is determined to be rising, N ₂ is the second number of thresholds; if N, << N ₂ , it is determined that the data transmission rate trend is unchanged. Preferably, the channel state information includes a false alarm rate 5ER, and the step (2) may further include the following processing: A. dividing the third decision period into multiple small periods;

B. Acquire the certificate of the feedback from the receiving end in each small period, or calculate the certificate in the current data sending mode by using the hybrid automatic retransmission or the automatic retransmission;

C. Counting the number of times BER ≤ BER in the third decision period, N _s , BER, is the threshold of the false alarm rate;

D. If N _S < N, it is determined that the data transmission rate trend is decreasing, which is the first time threshold; if ^ ≥ N ₂ , it is determined that the data transmission rate trend is rising, and N ₂ is the second frequency threshold. ; If N, << N ₂ , then the data transmission rate trend is determined to be unchanged.

(3) It is determined according to the data transmission rate trend that the SD+CDD mode or the SM+CDD mode is a data transmission mode suitable for the receiving end. Preferably, step 4 (3) may further include the following processing: A. If the transmission rate trend is rising, determining a mode corresponding to a data transmission rate between the current data transmission rate and the maximum transmission rate is suitable for the data of the receiving end. Preferably, a mode corresponding to a data transmission rate is determined between the current data transmission rate and the maximum transmission rate, and may be queried in a pre-configured rate table to obtain a mode corresponding to the data transmission rate. The rate table is a table pre-configured by the transmitting end according to the following method: a transmission rate corresponding to different modulation and coding modes when using spatial diversity cyclic delay diversity and a transmission corresponding to different modulation and coding modes when using spatial multiplexing cyclic delay diversity The rates are sorted to form a table, and the direction in which the transmission rate increases is the direction in which the rate increases, and the direction in which the transmission rate decreases is the direction in which the rate decreases. Each row in the table may include a data transmission mode, a modulation coding mode, a transmission rate, and a unique index ID (Index). An example is shown in Table 1. In Table 1, the transmission rate is arranged from small to large. The number of coding repetitions is R = l, and the spatial diversity cycle delay diversity is " = 1 , when spatial multiplexing cyclic delay diversity is used" = 2. Modulation methods include Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM), 16QAM, 64QAM, and encoding rates include 1/2, 2/3, 3 /4, 5/6. Table 1

B. If the transmission rate trend is declining, determining a mode corresponding to a data transmission rate between the current data transmission rate and the minimum transmission rate is a data transmission mode suitable for the receiving end; preferably, the current data transmission rate and the minimum transmission rate A mode corresponding to a data sending rate is determined, and may also be queried in a pre-configured rate table to obtain a mode corresponding to the data sending rate.

C. If the transmission rate trend is constant, keep the current data transmission mode unchanged. The above preferred implementation process will be described below with reference to FIGS. 13 to 18. Figure 13 is a flowchart of a method of selecting an antenna data transmission mode according to an eighth embodiment of the present invention. Among them, one sender serves multiple receivers below. The decision period N _T r is configured at the transmitting end, and the unit of T is a frame, which is the number of small periods in the decision period. The threshold for configuring the SR is that the threshold of the statistic is N, N ₂ , which is a positive integer, and N, ≤ N ₂ . Configure the rate table as shown in Table 1 above. The transmitting end performs the following processing on each receiving end in each decision period N to adjust the data transmission rate, and transmits the data by using the modulation coding mode and the data transmission mode corresponding to the data transmission rate. Step S1302: If the first adjustment is made, initialization / £) = 1, that is, the spatial diversity cyclic delay diversity data transmission mode and the modulation coding mode are selected as QPSK1/2 transmission data, otherwise //) is the last adjusted value, = 1. Step S1304: In the period of (-1) Γ + 1 to Γ, the total number of bursts sent by the transmitting end is M _totcd , the number of corresponding bits is B _total bits, and the HARQ or AQR first retransmitted bursts The number is one, corresponding to the number of bits, then the corresponding bit error rate = ^ / ^. Step S1306: = + l; such as BER BEF^, N _s = N _s +\. Step S1308: Steps S1304 to S1306 are repeated until the end of the decision period or N _s >Nr

Step S1310: If ≥ N ₂ , it is determined that the transmission rate trend of the receiving end is rising, H) = min(H) + l, 14); if N _s <N _x , the judgment is declining, H) = max(l , — 1); Moutine N, <N, <N ₂ , keep the data transmission rate unchanged, ID = ID. Step S1312: The data is transmitted by the corresponding data transmission mode selected in step S1310. It should be noted that the method used in this embodiment can also be implemented with a false burst rate of BER = M _rep IM _total . Figure 14 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 9 of the present invention. Wherein, a transmitting end has a plurality of receiving ends in the next month, and the unit of the determining period ^7\ 配置 is configured as a frame at the transmitting end, which is the number of small periods in the judgment period. The threshold for configuring the SR is that the threshold of the statistic is N, N ₂ , which is a positive integer, and N, ≤ N ₂ . Configure the rate table as shown in Table 1. The transmitting end performs the following processing on each receiving end in each decision period N to adjust the data transmission rate, and transmits the data by using the modulation coding mode and the data transmission mode corresponding to the data transmission rate. Steps S1402 to S1404: The same as steps S1302 to S1304 described above, and details are not described herein again. Step S1406: = + l; such as BEF^BEF^, N _s = N _s +\. Step S1408: repeating steps S1404 to S1406 until the end of the decision period or

N _S ≥ N ₂ . Step S1410: If ≥ N ₂ , it is judged that the transmission rate trend of the receiving end is decreasing, ID = max(l, /Z) - l); if N _S < N _{X is} judged to be rising, ID = min(H) + l, 14); If N, <N, <N ₂ , keep the data transmission rate unchanged, ID = ID. Step S1412: The data is transmitted by the corresponding data transmission mode selected in step S1410.

It should be noted that the method used in this embodiment can also be implemented with a false burst rate of BER = M _rep IM _total . Figure 15 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 10 of the present invention. Among them, one sender serves multiple receivers below. The decision period N _T r is configured at the transmitting end, and the unit of T is a frame, which is the number of small periods in the decision period. The initial value of the ί BER is ΒΕΙ^, the threshold of the statistic is N,, N ₂ , is a positive integer, and N, ≤ N ₂ . Configure the rate table as shown in Table 1. The transmitting end performs the following processing on each receiving end in each decision period N to adjust the data transmission rate, and transmits the data by using the modulation coding mode and the data transmission mode corresponding to the data transmission rate. Step S1502 - Step S1504: The same as Steps S1302 to S1304 described above, and details are not described herein again. Step S1506: If £ Κ ≤ £3⁄4 , N _s = N _s + \ Step S1508: z = z + 1; = BER. Step S1510: Steps S1504 to S1508 are repeated until the end of the decision period or ≥ N ₂ . Step S1512: If ≥ N ₂ , it is judged that the transmission rate trend of the receiving end is rising, ID = mm (ID + \, U); if N _s < N _x , the judgment is falling, H) = max(l, - 1); Moutine N, <N, <N ₂ , keep the data transmission rate unchanged, ID = ID. Step S1514: The data is transmitted by the corresponding data transmission mode selected in step S1512. It should be noted that the method used in this embodiment can also be implemented by using the error burst rate layer = MJM. Figure 16 is a flow chart showing a method of selecting an antenna data transmission mode in the eleventh embodiment of the present invention. Among them, one sender has several receivers in the next month. The decision period is configured at the transmitting end,

The unit of Γ is the frame, and ^ is the number of small periods in the decision period. The threshold value for configuring the C/NR threshold is N, N ₂ , which is a positive integer, and N, ≤ N ₂ . Configure the rate table, as shown in Table 1. The transmitting end performs the following processing on each receiving end in each decision period N to adjust the data transmission rate, and transmits the data by using the modulation coding mode and the data transmission mode corresponding to the data transmission rate. Step S1602: If the first adjustment, initialization / £) = 1, that is, the spatial diversity cyclic delay diversity data transmission mode and the modulation coding method are selected as QPSK1/2 transmission data, otherwise //) is the last adjusted value. , = 1. Step S1604: At the decision time iT, the CINR in the current data transmission mode is obtained. Step S1606: = + l; such as CINR^CINR^, N _s =N _s +\. Step S1608: Steps S1604 to S1606 are repeated until the end of the decision period or ≥ N ₂ . Step S1610: If ≥ N ₂ , it is judged that the transmission rate trend of the receiving end is rising, H) = min(H) + l, 14); if N _s <N _x , the judgment is falling, H) = max(l , — 1); Moutine N, <N, <N ₂ , keep the data transmission rate unchanged, ID = ID. Step S1612: The data is transmitted by using the corresponding data transmission mode selected by step S1610. Figure 17 is a flow chart showing a method of selecting an antenna data transmission mode according to Embodiment 12 of the present invention. Among them, one sender serves multiple receivers below. The decision period Ν _Τ配置 is configured at the transmitting end, and the unit of Γ is the frame, which is the number of small periods in the decision period. The threshold value for configuring the C/NR threshold is N, N ₂ , which is a positive integer, and N, ≤ N ₂ . Configure the rate table, as shown in Table 1. The transmitting end performs the following processing on each receiving end in each decision period N to adjust the data transmission rate, and transmits the data by using the modulation coding mode and the data transmission mode corresponding to the data transmission rate. Steps S1702 to S1704: are the same as steps S1602 to S1604 described above, and are not mentioned here. Step S 1706: i = i + l; such as CINR^CINR^, N _s = N _s +\. Step S1708: Repeat steps S1704 to S1706 until the end of the decision period or

N _S ≥ N ₂ . Step S1710: If ≥ N ₂ , judge that the transmission rate trend of the receiving end is decreasing, ID = max(l, ID -I); if N _s <N _x , the judgment is rising, H) = min(H) + l, 14); ^ 口果N, <N, <N ₂ , keep the data transmission rate unchanged, ID = ID. Step S1712: The data is transmitted in the data transmission mode corresponding to the selected data set in step S1710. Figure 18 is a flow chart showing a method of selecting an antenna data transmission mode in the thirteenth embodiment of the present invention. Among them, one sender serves multiple receivers below. The decision period Ν _Τ配置 is configured at the transmitting end.

The unit of Γ is the frame, which is the number of small periods in the decision period. The initial value of the configured C/NR is that the threshold of the statistic is N, N ₂ , which is a positive integer, and N, ≤ N ₂ . Configure the rate table, as shown in Table 1. The transmitting end performs the following processing on each receiving end in each decision period N to adjust the data transmission rate, and transmits the data by using the modulation coding mode and the data transmission mode corresponding to the data transmission rate. Steps S1802 to S1804: The same as steps S1602 to S1604 described above, and details are not described herein again. Step S 1806: For example, CINR^CINR^, N _s =N _s +\. Step S 1808: i = i + \; CINR^ = CINR. Step S1810: Steps S1804 to S1808 are repeated until the end of the decision period or ≥ N ₂ . Step S1812: If ≥ N ₂ , it is judged that the transmission rate trend of the receiving end is rising, H) = min(H) + l, 14); if N _s <N _x , the judgment is falling, H) = max(l , — 1); Moutine N, <N _S <N ₂ , keep the data transmission rate unchanged, ID = ID. Step S1814: The data is transmitted in the data transmission mode corresponding to the selected data set in step S1812. 19 is a block diagram showing the structure of an apparatus for selecting an antenna data transmission mode according to an embodiment of the present invention. The selection device of the antenna data transmission mode includes: a determination module 10 and a transmission module 12. a determining module 10, configured to determine a spatial diversity cyclic delay diversity (SD+CDD) mode or a spatial multiplexing cyclic delay diversity (SM+CDD) mode is a data transmission mode suitable for a receiving end, and a sending module 12, configured to: The antenna data is transmitted using the determined data transmission mode. With the above device, the system channel state information can be selected, and the data transmission mode can be flexibly selected to transmit data for spatial diversity cyclic delay diversity or spatial multiplexing cyclic delay diversity. This increases the stability of the link and increases the throughput of the system. In the wireless communication system, the above channel state information may include, but is not limited to, at least one of the following: CINR BER spatial correlation information. The SR is the error burst rate or the bit error rate, which is fed back to the sending end by the receiving end. Alternatively, the sending end is calculated. The specific calculation method is mentioned above, and is not described here. The calculation process and the preferred calculation process of the spatial correlation represented by the condition number of the channel correlation matrix are also mentioned above, and are not described herein again. Preferably, the determining module 10 may further include: a first determining unit 100, configured to determine

The modulation order Μ^, the coding rate Ρ the number of coding repetitions R _SDCTm corresponding to the signal-to-noise ratio CINR in the SD+CDD mode; the first calculation unit 102, configured to calculate the transmission rate in the SD+CDD mode, where, represents spatial diversity a multi-input multi-output coding rate; a second determining unit 104, configured to determine a modulation order M _WCT3⁄45 corresponding to a signal-to-noise ratio C/NR _{WCTm in the} SM+CDD mode, and an encoding rate

The number of coding repetitions is ∞; the second calculation unit 106 is configured to calculate the transmission rate in the SM+CDD mode.

VsMCDD = (XSMCDD X , where " _WCT5D represents the multi-input multiple-output coding rate of spatial multiplexing; a third determining unit 108, configured to determine the larger one in _^^^ and determine the corresponding data transmission The mode is a data transmission mode suitable for the receiving end. In the preferred implementation, the working mode of the above-mentioned units in combination with each other can be referred to FIG. 6 , and details are not described herein. Preferably, the determining module 10 may further include: When the calculation obtains the fourth determining unit 112 for the threshold value greater than the condition number, 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 manner of the above units combined with each other can be seen in FIG. I won't go into details here. Preferably, the determining module 10 may further include: a first setting unit 114, configured to set a first decision period T1, where the unit of T1 is a frame; the first obtaining unit 116, configured to acquire a BER fed back by the receiving end, or use a hybrid automatic Retransmission or automatic retransmission to calculate the BER in the current data transmission mode; the fifth determining unit 118 is configured to determine that the SM+CDD mode is suitable for the data transmission mode of the receiving end when the 5ER is smaller than the false alarm rate threshold S Ro Otherwise, it is determined that the SD+CDD mode is a data transmission mode suitable for the receiving end. In the preferred implementation, the working manners of the foregoing units are combined with each other. See FIG. 8 , and details are not described herein again. Preferably, the determining module 10 may further include: a second obtaining unit 120, configured to use

The receiving end of the SD+CDD mode obtains the CINR in the SD+CDD mode; the sixth determining unit 122 is configured to use the C/NR greater than the first signal to noise ratio threshold ()/)/) _ 7/. The SM+CDD mode is determined to be 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; and the third obtaining unit 124 is configured to use the receiving end of the SM+CDD mode. Obtaining the feedback of the receiving end, or calculating the S£R in the current data transmission mode by using the hybrid automatic retransmission or the automatic retransmission; the seventh determining unit 126, when the S£R is greater than the false alarm rate threshold, It is determined that the SD+CDD mode is suitable for the data transmission mode of 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, the working manners of the foregoing units are combined with each other. See FIG. 9 , and details are not described herein again. In a preferred implementation, a combination of the CINR and each of the above determination schemes may be used to determine whether the SD+CDD mode or the SM+CDD mode is suitable for the data transmission mode of the receiving end (ie, a better data transmission mode). See Figure 10. In a preferred implementation, a combination of the decision period and each of the foregoing determination schemes may be used to determine whether the SD+CDD mode or the SM+CDD mode is suitable for the data transmission mode of the receiving end (ie, 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 decision period T3, where the unit of T3 is a frame; and a determining unit 130, configured to: in the third determining period, the root The data transmission rate trend is determined according to the channel state information. The eighth determining unit 132 is configured to determine, according to the data transmission rate trend, that the SD+CDD mode or the SM+CDD mode is a data transmission mode suitable for the receiving end. In the preferred implementation, the working manners of the above-mentioned units in combination with each other can be seen in FIG. 12 to FIG. 18, and details are not described herein again. In summary, the antenna data transmission mode selection scheme provided by the foregoing embodiment of the present invention can flexibly select the data transmission mode as spatial diversity according to system channel state information (for example, channel conditions and application scenario changes). Cyclic delay diversity or spatial multiplexing cyclic delay diversity is used to transmit data. This increases the stability of the link and increases the throughput of the system. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

The invention relates to a method for selecting an antenna data transmission mode, which is characterized in that it comprises:

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

 The transmitting end transmits data using the determined data transmission mode. The method according to claim 1, wherein the channel state information includes a signal to noise ratio (CINR), and the transmitting end determines a data transmission mode suitable for the receiving end, including:

Determining a modulation order M coding rate Α _σσ∞ corresponding to a signal-to-noise ratio CINR in the SD+CDD mode, a coding repetition number R _SDCTM , and calculating a transmission rate V _SDDDD = i _{SDCDD in} the SD+CDD _mode ^^SDCDD ^X PsDCDD ^÷ ^SDCDD , where ^SDCDD represents the multi-input multi-output encoding rate of spatial diversity;

Determining a modulation order M coding rate encoding repetition number R _OTD corresponding to a signal to noise ratio CINR in the SM+CDD mode, and calculating a transmission rate in the SM+CDD mode

^÷ ^SMCDD, where ^SMCDD represents spatially multiplexed multiple-input multiple-output coding rate; determining the larger one in the description and determining that the larger data transmission mode is suitable for the data of the receiving end Send mode. The method according to claim 1, wherein the channel state information includes spatial correlation information, the spatial correlation is represented by a condition number 51 of a channel correlation matrix, and the transmitting end determines data suitable for the receiving end. The sending mode includes:

 Calculate the acquisition

If it is greater than the condition number threshold. When it is determined that the SM+CDD mode is a data transmission mode suitable for the receiving end, otherwise, determining that the SD+CDD mode is a data transmission mode suitable for the receiving end. The method according to claim 3, characterized in that the obtaining of the 3⁄4 is calculated by:

91 = ^{mm ( ?} ) or 91 = ^{mm ( ?)} or 91 = _mn (R) , where tr(R) represents HR) A _max (R)

The traces of the channel correlation matrix R, UR ) and n (R) respectively represent the maximum eigenvalue and the minimum eigenvalue of the R; the R is calculated by: ϋ , where N _e is used

To calculate the number of carriers on the carrier set of the channel correlation matrix,

H(k) = ; ; ; ; and ≥ 0 are the channel coefficient matrix and the proportional coefficient of the A-th subcarrier in the carrier set, respectively, which are the _th root transmitting antenna to the kth carrier between the root receiving antennas The channel coefficient, _/ = 1,... = 1,..., N , Μ is the actual number of physical transmit antennas or the number of virtual antennas, Ν is the number of receive antennas. The method according to claim 1, wherein the channel state information includes a false transmission rate BER, and the transmitting end determines a data transmission mode suitable for the receiving end, including:

 Setting the first decision period Τ 1 , the unit of Τ 1 is a frame;

 Obtaining the leg fed back by the receiving end, or calculating the BER in the current data sending mode by using hybrid automatic retransmission or automatic retransmission;

 If the 5ER is less than the false alarm rate 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. The method according to claim 1, wherein the channel state information comprises: a BER and a CINR, and the transmitting end determines a data transmission mode suitable for the receiving end, including:

 For the receiving end using the SD+CDD mode, the CINR in the SD+CDD mode is obtained if the CINR is greater than the first signal to noise ratio threshold SDCDD _ 7H. Determining that the SM+CDD mode is a data transmission mode suitable for the receiving end, otherwise, determining that the SD+CDD mode is a data transmission mode suitable for the receiving end;

For the receiving end using the SM+CDD mode, obtain the BER fed back by the receiving end, or calculate the BER in the current data transmission mode by using hybrid automatic retransmission or automatic retransmission, such as Fruit ^? More than the false alarm rate threshold S, 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. The method according to any one of claims 2 to 6, wherein the channel state information comprises C/NR, and the transmitting end determines a data transmission mode suitable for the receiving end, comprising: setting a first threshold interval [SDCDD _TH\, SDCDD TH1], for the receiving end using the SD+CDD mode, calculate C/Ni? in the SD+CDD mode, if CINR < SDCDD _ ΤΗ\, then determine that the SD+CDD mode is Suitable for the data transmission mode of the receiving end; for example, CINR > SDCDD _ΤΗ2, determining that the SM+CDD mode is a data transmission mode suitable for the receiving end; if the C/NR is located in the first threshold interval, executing claim 2 The step of determining a data transmission mode suitable for the receiving end according to any one of -6, to determine that the SD+CDD mode or the SM+CDD mode is a data transmission mode suitable for a receiving end;

 Set a second threshold interval [SMCDD _ TH\, SMCDD _ TH2] for calculating the C/NR in the SM+CDD mode for the receiving end using the SM+CDD mode; if CINR < SMCDD _ ΤΗ\ Determining that the SD+CDD mode is a data transmission mode suitable for the receiving end; for example, CINR > SMCDD_TH2, determining that the SM+CDD mode is a data transmission mode suitable for the receiving end; if the C/NR is located at the In the second threshold interval, the transmitting end according to any one of claims 2-6 determines a data transmission mode suitable for the receiving end to determine that the SD+CDD mode or the SM+CDD mode is suitable. The data transmission mode at the receiving end. The method according to any one of claims 2 to 6, wherein the transmitting end determines that the data transmission mode suitable for the receiving end comprises:

 Setting a second decision period T2, the unit of T2 is a frame;

 Setting L decision points in the second decision period, where L is an integer greater than or equal to 1;

Determining, in each of the decision points, the step of determining a data transmission mode suitable for the receiving end according to any one of claims 2-6, to determine that the SD+BF mode or the SM+CDD mode is suitable for the receiving end Data transmission mode, and counting the number of times the SD+BF mode is suitable for the data transmission mode of the receiving end Ν1, or counting the number of times the SM+CDD mode is suitable for the data transmission mode of the receiving end Ν2; Determining that the SD+BF mode is a data transmission mode suitable for the receiving end if N1/L is greater than or equal to the predetermined value Tr, otherwise determining that the SM+CDD mode is a data transmission mode suitable for the receiving end;

 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+BF mode is a data transmission mode suitable for the receiving end.

9. The method of claim 7, wherein the determining, by the transmitting end, the data transmission mode suitable for the receiving end comprises:

 Setting a second decision period T2, the unit of T2 is a frame;

 Setting L decision points in the second decision period, where L is an integer greater than or equal to 1;

 Determining, at each of the decision points, the step of determining a data transmission mode suitable for the receiving end according to claim 7, to determine that the SD+CDD mode or the SM+CDD mode is a data transmission mode suitable for the receiving end, and Counting the SD+CDD mode is the number of times N1 suitable for the data transmission mode of the receiving end, or counting the number of times N2 that the SM+CDD mode is suitable for the data transmission mode of the receiving end;

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

 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 method according to claim 1, wherein the determining, by the transmitting end, the data transmission mode suitable for the receiving end comprises:

 Set the third decision period T3, the unit of T3 is the frame;

 In the third decision period, the transmitting end determines a data transmission rate trend according to the channel state information;

The SD+CDD mode or the SM+CDD mode is determined to be a data transmission mode suitable for the receiving end according to the data transmission rate trend.

The method according to claim 10, wherein the channel state information comprises C/NR, and the sending end determines, according to the channel state information, a data transmission rate trend, including:

Setting a plurality of decision points in the third decision period, sequentially obtaining CINR in the current data transmission mode at each of the decision points, and counting the number of times N _{s of} CINR ≥ CINR^ in the third decision period, The C/ is the second SNR threshold; if N _s ≤ N, it is determined that the data transmission rate trend is decreasing, and the N is the first time threshold; if ≥ N ₂ , determining The data transmission rate trend is rising, and the _second is the second number of thresholds; for example, N\<N _S <N ₂ , it is determined that the data transmission rate trend is unchanged.

The method according to claim 10, wherein the channel state information comprises S R , and the sending end determines, according to the channel state information, a data transmission rate trend, including:

 Dividing the third decision period into a plurality of small periods;

 Obtaining the BER fed back by the receiving end in each of the small periods, or calculating the BER in the current data transmission mode by using the hybrid automatic retransmission or the automatic retransmission;

 Counting the number of times ? ? ≤ ^ in the third decision period, and the £ is a false alarm rate threshold;

If ≤ N, it is determined that the data transmission rate trend is decreasing, and the N is a first time threshold; if ≥ N ₂ , determining that the data transmission rate trend is rising, and the _second is The second order threshold value; if N\<N _S <N ₂ , it is determined that the data transmission rate trend is unchanged.

The method according to any one of claims 10 to 12, wherein the SD+CDD mode or the SM+CDD mode is determined to be a data transmission mode suitable for a receiving end according to the data transmission rate trend. Includes:

 If the transmission rate trend is rising, determining a mode corresponding to a data transmission rate between the current data transmission rate and the maximum transmission rate is a data transmission mode suitable for the receiving end;

If the transmission rate trend is decreasing, determining a mode corresponding to a data transmission rate between the current data transmission rate and the minimum transmission rate is a data transmission mode suitable for the receiving end; If the transmission rate trend is constant, the current data transmission mode is kept unchanged.

A device for selecting an antenna data transmission mode, comprising: a determining module, configured to determine, according to channel state information, from a spatial diversity cyclic delay diversity SD+CDD mode or a spatial multiplexing cyclic delay diversity SM+CDD mode Suitable for the data transmission mode of the receiving end;

 And a sending module, configured to send data by using the determined data sending mode.

The device according to claim 14, wherein the determining module comprises:

 a first determining unit, configured to determine a modulation order M^CDD, a coding rate P, and an encoding repetition number corresponding to a signal-to-noise ratio CINR in the SD+CDD mode; and a first calculating unit, configured to calculate the SD+CDD Transmission rate in mode

^SDCDD = ^A SDCDD ^X ^SDCDD ^X ^SDCDD ^÷ ^SDCDD ' where ^SDBF represents the multi-input multi-output encoding rate of the inter-diversity;

a second determining unit, configured to determine a modulation order M _WCT3⁄45 corresponding to a signal to noise ratio C/NR _{WCTM in} the SM+CDD mode, and a coding rate

Number of coding repetitions ^∞;

 a second calculating unit, configured to calculate a sending rate in the SM+CDD mode

VsMCDD = (XSMCDD >< ^M SMCDD X ^P SMCDD ^{÷ R} SMCDD, where D represents a spatially multiplexed multiple input multiple output coding rate; a third determining unit is configured to determine the comparison with the ^^0∞ The larger one, and determining that the data transmission mode corresponding to the larger one is a data transmission mode suitable for the receiving end.

The device according to claim 14, wherein the determining module comprises:

 a calculation unit, configured to calculate and obtain the

The fourth determining unit is configured to be greater than the condition number threshold. When 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 device according to claim 14, wherein the determining module comprises: a first setting unit, configured to set a first decision period T1, a unit of T1 is a frame; a first acquiring unit, acquiring the receiving The BER of the end feedback, or the SR in the current data transmission mode is calculated by using the hybrid automatic retransmission or the automatic retransmission; and the fifth determining unit is configured to determine, when the S£R is less than the false alarm rate threshold S^ 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 device according to claim 14, wherein the determining module comprises:

 a second acquiring unit, configured to obtain, by using a receiving end of the SD+CDD mode, a CINR in the SD+CDD mode;

a sixth determining unit, configured to determine, when the CINR is greater than the first signal to noise ratio threshold SDCDD_TH ₀ , that the SM+CDD mode is a data transmission mode suitable for the receiving end, otherwise, determine the “) α)Ζ) _ Hey. The mode is a data transmission mode suitable for the receiving end; the third obtaining unit is configured to obtain a certificate fed back by the receiving end for using the receiving end of the SM+CDD mode, or calculate current data by using hybrid automatic retransmission or automatic retransmission. In send mode

 a seventh determining unit, configured to determine, when S R is greater than a false alarm rate threshold S

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.

The device according to claim 14, wherein the determining module comprises:

 a second setting unit, configured to set a third decision period T3, where the unit of T3 is a frame; a determining unit, configured to determine a data transmission rate trend according to the channel state information in the third determining period;

 And an eighth determining unit, configured to determine, according to the data transmission rate trend, that the SD+CDD mode or the SM+CDD mode is a data transmission mode suitable for the receiving end.