WO2011134185A1 - Procédé et appareil permettant de sélectionner un mode de transmission de données d'antenne - Google Patents

Procédé et appareil permettant de sélectionner un mode de transmission de données d'antenne Download PDF

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Publication number
WO2011134185A1
WO2011134185A1 PCT/CN2010/073932 CN2010073932W WO2011134185A1 WO 2011134185 A1 WO2011134185 A1 WO 2011134185A1 CN 2010073932 W CN2010073932 W CN 2010073932W WO 2011134185 A1 WO2011134185 A1 WO 2011134185A1
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WIPO (PCT)
Prior art keywords
data transmission
mode
receiving end
cdd
transmission mode
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PCT/CN2010/073932
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English (en)
Chinese (zh)
Inventor
肖华华
贾晓山
朱登魁
鲁照华
张万帅
刘锟
Original Assignee
中兴通讯股份有限公司
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Publication of WO2011134185A1 publication Critical patent/WO2011134185A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing

Definitions

  • BACKGROUND Cyclic Delay Diversity 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 as shown in FIG. 1. After the channel is coded and modulated, the source is formed by Inverse Fast Fourier Transform (IFFT), and the corresponding cycle is performed by using the cyclic delay of the corresponding physical antenna.
  • IFFT Inverse Fast Fourier Transform
  • SM Spatial Multiplexing
  • CP Physical Prefix
  • ⁇ the number of physical antennas at the transmitting end, which is generally 0.
  • Spatial Multiplexing is a method in which multiple antennas exist at the same time on the transmitting end and the receiving end. The transmitting end sends different data sending streams on different physical antennas to improve the data transmission rate. As shown in FIG. 2, in the system of the M physical antenna and the receiving end R physical antenna, the transmitting antenna transmits different modulation symbols.
  • the combination of spatial multiplexing and cyclic delay diversity forms a new method of transmitting data, called Spatial Multiplexing Cyclic Delay Diversity (SM + CDD).
  • the system divides the antenna into M sub-arrays, and the antenna of each sub-array performs cyclic delay diversity, which is equivalent to a virtual antenna.
  • a spatial multiplexing structure is formed between the versatile virtual antennas.
  • cyclic delay diversity can only transmit one data on the same carrier at the same time.
  • the signal-to-noise ratio is generally high, and high-order modulation and coding can be used to improve throughput.
  • the coverage is relatively large. Suitable for cell edge receivers.
  • Spatial multiplexing cyclic delay diversity At one moment, different virtual antennas can transmit multiple different symbols on the same carrier. The throughput is generally large, but the coverage is relatively small.
  • a method of selecting an antenna data transmission mode is provided.
  • the method for selecting an antenna data transmission mode according to the present invention includes: transmitting channel state information from a cyclic delay diversity (CDD) mode and a spatial multiplexing cyclic delay diversity (SM+CDD) mode to determine data transmission suitable for the receiving end Mode; and the sender transmits data using the determined data transmission mode.
  • an apparatus for selecting an antenna data transmission mode includes: a determining module, configured to determine data suitable for a receiving end from a cyclic delay diversity (CDD) mode and a spatial multiplexing cyclic delay diversity (SM+CDD) mode according to channel state information Transmit mode; a sending module, configured to send data using a determined data transmission mode.
  • the transmitting end determines, according to the channel state information, a cyclic delay diversity (CDD) mode or a spatial multiplexing cyclic delay diversity (SM+CDD) mode, which is suitable for the data transmission mode of the receiving end, and uses a data transmission mode transmitting antenna suitable for the receiving end.
  • CDD cyclic delay diversity
  • S+CDD spatial multiplexing cyclic delay diversity
  • the invention solves the problem that the data transmission mode is selected in the cyclic delay diversity and the spatial multiplexing cyclic delay diversity in the related art, and the data transmission mode cannot be flexibly selected according to the system channel condition to be cyclic delay diversity and spatial multiplexing cyclic delay diversity. send data.
  • the stability of the link is increased and the throughput of the system is improved.
  • FIG. 1 is a schematic structural diagram of a 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 transmitting end of a related art in which SM and CDD are combined
  • FIG. 4 is a flowchart of a method for selecting an antenna data transmission mode according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 1 of the present invention
  • FIG. 7 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 3 of the present invention
  • FIG. 8 is a flowchart of antenna data according to Embodiment 4 of the present invention
  • FIG. 9 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 5 of the present invention
  • FIG. 10 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 6 of the present invention
  • 11 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 7 of the present invention
  • FIG. 12 is a diagram of an embodiment of the present invention.
  • FIG. 13 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 9 of the present invention;
  • FIG. 14 is a method for selecting an antenna data transmission mode according to Embodiment 10 of the present invention;
  • FIG. 15 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 11 of the present invention;
  • 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.
  • the receiving end is a type of terminal for receiving data or information.
  • the various embodiments of the present invention are described below as being implemented on the basis of the wireless communication system.
  • 4 is a flow chart of a method of selecting an antenna data transmission mode according to an embodiment of the present invention. As shown in FIG. 4, the method for selecting the antenna data transmission mode includes:
  • the transmitting end channel state information determines a data transmission mode suitable for the receiving end from a cyclic delay diversity (CDD) mode and a spatial multiplexing cyclic delay diversity (SM+CDD) mode; and
  • the sending end sends data by using a determined data sending mode.
  • the data transmission mode cannot be flexibly selected according to channel conditions to increase link stability and improve throughput, and the above embodiment is used.
  • the provided technical solution can flexibly select the data transmission mode as cyclic delay diversity and spatial multiplexing cyclic delay diversity to transmit data, which increases the stability of the link and improves the throughput of the system.
  • the above channel state information may include, but is not limited to, at least one of the following: CINR, BER, spatial correlation information.
  • SR is the error burst rate or the bit error rate, which is fed back to the transmitting end by the receiving end; or the transmitting end is calculated by the calculation method as follows:
  • the statistical transmitting end sends a total
  • the number of bursts is M total
  • the number of corresponding bits is B total bits
  • the above spatial correlation is represented by a condition number of the channel correlation matrix, that is, the condition number 3 ⁇ 4 is calculated according to the channel correlation matrix R in one or more frames in a selected period as follows:
  • the carrier wave of the channel phase matrix contains the number of carriers
  • the channel state information includes a CINR
  • the transmitting end determines that the data transmission mode suitable for the receiving end may further include the following processing: (1) determining a modulation order of a signal to noise ratio C/N ⁇ CD in the CDD mode. Number, encoding rate P CDD , number of encoding repetitions, and calculation of transmission rate in CDD mode
  • Rate ⁇ ⁇ 1 ⁇ ⁇ > ⁇ ⁇ ⁇ ⁇ ⁇ , where "the encoding rate for spatial multiplexing loop delay diversity;
  • FIG. 5 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 1 of the present invention. As shown in FIG.
  • Step S502 Calculate the signal-to-noise ratio CINRCDD of the receiving end under cyclic delay diversity, and use it to check the table to find the suitable signal to noise ratio.
  • the modulation coding mode corresponds to the modulation order ⁇ ⁇ , the coding rate P CDD , the number of repetitions and the calculation of the cyclic delay diversity data transmission mode in the transmission rate is Step S504: Calculate the C/NR WCTm of the receiving end in the spatial multiplexing cyclic delay diversity data transmission mode, determine the modulation order M, the coding rate o ⁇ , and the code repetition number corresponding to the modulation and coding mode of the receiving end;
  • the transmission rate year in the delay diversity data transmission mode axM D x P 11 "is the MIMO coding rate at the time of spatial multiplexing.
  • Step S506 Compare ⁇ , if ⁇ D ⁇ V, select the cyclic delay diversity mode (ie, determine the 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 the selected data transmission mode.
  • the channel state information includes spatial correlation information, and the spatial correlation is represented by the condition number 51 of the channel correlation matrix.
  • FIG. 6 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. 6, the transmitting end sets a threshold value in advance.
  • Step S602 Initializing the previous channel correlation matrix R Pre , repeating step 4 S S604 in the selected period T until the end of the period T.
  • 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 For the first root to send the antenna to the root between the receiving antenna
  • 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.
  • step S608 If the spatial multiplexing cyclic delay diversity mode is selected, otherwise, the cyclic delay diversity mode is selected, step S610: transmitting the data of the receiving end in the selected data transmission mode.
  • the channel state The information includes the SR, and the foregoing sending end determines that the data sending mode suitable for the receiving end may further include the following processing:
  • FIG. 7 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 3 of the present invention.
  • Step S702 Obtain the S£R fed back by the receiving end, or calculate the current data by using HARQ or ARQ. ⁇ ; in step S704. If ⁇ ⁇ , the spatial multiplexing cyclic delay diversity mode is preferred, otherwise the cyclic delay diversity mode is preferred.
  • Step S706 Send data by using a selected better data transmission mode.
  • the channel state information includes: BER and CINR, and the foregoing transmitting end determines the data transmission mode suitable for the receiving end, and may further include the following processing: (1) obtaining the CDD mode for the receiving end currently using the CDD mode CINR, if
  • the CINR is greater than the first signal to noise ratio threshold a) D_H. , it is determined that the SM+CDD mode is a suitable data transmission mode, otherwise, it is determined that the CDD mode is a suitable data transmission mode.
  • the receiver currently using the SM+CDD mode obtain the BER fed back by the receiver, or calculate the current data transmission mode by using hybrid automatic retransmission or automatic retransmission, if S£R is greater than the false alarm rate gate
  • the limit value determines whether the CDD mode is a suitable data transmission mode. Otherwise, it is determined that the SM+CDD mode is a suitable data transmission mode.
  • 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 be cyclic delay diversity and spatial multiplexing cyclic delay diversity to transmit data. The above preferred implementation process is described below in conjunction with FIG. FIG.
  • Step S802 For the receiving end currently using the cyclic delay diversity mode, obtain C/NR, ⁇ CINR > CDD ⁇ in the cyclic delay diversity mode, and then determine the spatial complex It is better to use the cyclic delay diversity mode; otherwise, it is better to determine the cyclic delay diversity mode.
  • Step S804 For the receiving end that currently uses the spatial multiplexing cyclic delay diversity mode, obtain the BER fed back by the receiving end in the decision period, or calculate the current data transmission mode by using HARQ or ARQ; for example, BE BEI ⁇ , It is better to choose the cyclic delay diversity mode, otherwise the spatial multiplexing cyclic delay diversity mode is better.
  • Step S806 The data is sent in the selected better data transmission mode.
  • the channel state information includes a signal to noise ratio C/NR, and the transmitting end determines a data transmission mode suitable for the receiving end, and may further include the following processing:
  • the receiving end of the SM+CDD mode calculates the C/NR in the spatial multiplexing cyclic delay diversity mode; if CINR ⁇ SMCDD _ ⁇ , it determines that the CDD mode is suitable for the data transmission mode of the receiving end; for example, CINR > SMCDD ⁇ 2 Determining that the SM+CDD mode is a data transmission mode suitable for the receiving end; if the C/NR is located in the second threshold interval, performing any of the above-mentioned transmitting ends to determine a data transmission mode suitable for the receiving end, To determine CDD mode or SM+CDD The 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. 9 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 5 of the present invention.
  • the sender presets the interval thresholds [CDD_Tm, CDD_TH2] and [SMCDD_THI, SMCDD_TH2].
  • the interval thresholds [CDD_Tm, CDD_TH2] and [SMCDD_THI, SMCDD_TH2].
  • Step S902 The current data transmission mode is the receiving end of the cyclic delay diversity mode; Calculate the c/NR in the mode, if c /NR ⁇ a)D_rHi, then it is determined that the cyclic delay diversity mode is better;
  • Step S904 The current data transmission mode is the receiving end of the spatial multiplexing cyclic delay diversity mode.
  • Step S906 Send data by using a selected better data transmission mode.
  • the foregoing sending end determines that the data sending mode suitable for the receiving end may further include the following processing:
  • the data transmission mode scheme is to determine whether the CDD mode or the SM+CDD mode is suitable for the data transmission mode of the receiving end, and the CDD mode is the number of times the data transmission mode is suitable for the receiving end, or the statistical SM+CDD mode is suitable for receiving.
  • the number of times the data transmission mode of the end is N2;
  • N1/L is greater than or equal to the predetermined value Tr, it is determined that the 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;
  • FIG. 10 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 6 of the present invention. As shown in FIG.
  • Step S 1006 Repeat step S 1004 until the end of the week or
  • Step S 1008 If (a) D_NMW7J) ⁇ 7, the cyclic delay diversity mode is selected to be better, otherwise the spatial multiplexing cyclic delay diversity mode is preferred.
  • Step S1010 The data is transmitted by selecting a better data transmission mode in the next cycle. Enter the next decision cycle.
  • 11 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.
  • Step S1104 Perform a scheme for determining a data transmission mode suitable for the receiving end by using any of the above-mentioned transmitting ends at each decision time, if the spatial multiplexing cyclic delay diversity mode is better , then
  • Step S 1106 Repeat step S 1104 until the end of the week or
  • Step S1 Send data by selecting a better data transmission mode in the next cycle. Enter the next decision cycle.
  • the transmitting end determines the data transmission mode suitable for the receiving end, and may further include the following processing:
  • step (2) 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:
  • step (2) may further include Processing:
  • B. Acquire the feedback of the receiving end in each small period, or calculate the certificate in the current data sending mode by using hybrid automatic retransmission or automatic retransmission;
  • C. Count the number of times ? ⁇ in the third decision period ⁇ , Is the false alarm rate threshold;
  • N S ⁇ N it is determined that the data transmission rate trend is decreased, and 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 time threshold; If N, ⁇ N 2 , then the data transmission rate trend is determined to be constant.
  • step 4 (3) may further comprise the following processing:
  • 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; preferably, the current data transmission rate and the maximum transmission rate.
  • a mode corresponding to a data sending rate is determined, and may be queried in a pre-configured rate table to obtain a mode corresponding to the data sending 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 cyclic delay diversity and a transmission rate corresponding to different modulation and coding modes when using spatial multiplexing cyclic delay diversity Sorting, forming a table, and specifying that the direction in which the transmission rate increases is the direction in which the rate rises, 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 and coding scheme, a transmission rate, and a unique index ID (Index).
  • Table 1 An example is shown in Table 1. In the table, the transmission rate is from 4 to 4 columns.
  • 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
  • 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.
  • Figure 12 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 has multiple receivers in the next month.
  • the decision period N 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 S1208 Steps S1204 to S1206 are repeated until the judgment period ends or
  • Figure 13 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 9 of the present invention.
  • a transmitting end has a plurality of receiving ends in the next month, and the unit of the determining period ⁇ 7 ⁇ ⁇ 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 .
  • 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 S1302 to S1304 The same as steps S1202 to S1204 described above, and details are not described herein again.
  • Step S1308 repeat steps S1304 to S1306 until the end of the decision period or
  • FIG. 14 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 10 of the present invention.
  • 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 ⁇ BER is ⁇
  • the threshold of the statistic is N,
  • N 2 is a positive integer
  • N, ⁇ N 2 is a positive integer
  • 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 S1202 to S1204 described above, and details are not described herein again.
  • FIG. 15 is a flowchart of a method of selecting an antenna data transmission mode according to Embodiment 11 of the present invention. Among them, one sender serves multiple receivers below. The decision period ⁇ ⁇ ⁇ is configured at the transmitting end.
  • the unit of ⁇ 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 .
  • 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 S1504 At the decision time ⁇ , the C/NR in the current data transmission mode is obtained.
  • Step S1508 Steps S1504 to S1506 are repeated until the decision period ends or ⁇ N 2 .
  • Step S1512 The data is transmitted in the data transmission mode corresponding to the selected data set in step S1510.
  • 16 is a flowchart of a method for selecting an antenna data transmission mode according to Embodiment 12 of the present invention; Figure. Among them, one sender serves multiple receivers below. The decision period ⁇ ⁇ ⁇ is configured at the transmitting end.
  • the unit of ⁇ 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 .
  • 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 S1602 to S1604 The same as steps S1502 to S1504 described above, and details are not described herein again.
  • Step S1608 Steps S1604 to S1606 are repeated until the end of the decision period or N s >Nr.
  • 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 in the thirteenth embodiment of the present invention. Among them, one sender serves multiple receivers below.
  • the decision period ⁇ ⁇ ⁇ is configured at the transmitting end.
  • the unit of ⁇ 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 .
  • 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 S1502 to S1504 described above, and are not described herein again.
  • Step S1710 Steps S1704 to S1708 are repeated until the decision period ends or ⁇ N 2 .
  • Step S1714 The data is transmitted in the data transmission mode corresponding to the selected data set in step S1712.
  • the selection device of the antenna data transmission mode includes: a determination module 10 and a transmission module 12.
  • the determining module 10 is configured to determine, according to the channel state information, a data transmission mode suitable for the receiving end from the cyclic delay diversity mode and the spatial multiplexing cyclic delay diversity mode; and the sending module 12 is configured to send the antenna data by using the determined data transmission mode.
  • the system channel state information can be flexibly selected, and the data transmission mode is flexibly selected to be cyclic delay diversity and spatial multiplexing cyclic delay diversity to transmit data. This increases the stability of the link and increases the throughput of the 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 of the spatial correlation represented by the condition number of the channel correlation matrix is also mentioned above, and details are not described herein again.
  • the determining module 10 may further include: a calculating unit 110 for calculating acquisitions; The determining unit 112 is configured to be greater than the condition number threshold.
  • determining that the SM+CDD mode is a suitable data transmission mode otherwise, determining that the CDD mode is a suitable data transmission mode.
  • the above units are combined with each other.
  • 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 unit 116 is configured to obtain a certificate fed back by the receiving end, or calculate the current data sending mode by using hybrid automatic retransmission or automatic retransmission.
  • a fifth determining unit 118 configured to determine when S£R is less than a false alarm rate threshold
  • the SM+CDD mode is a suitable data transmission mode, otherwise it is determined that the CDD mode is a suitable data transmission mode.
  • the determining module 10 may further include: a second obtaining unit 120, configured to obtain C/NR in the CDD mode for the receiving end using the CDD mode; and a sixth determining unit 122, configured to use the CINR greater than the first signal to noise Specific threshold a) D_ H.
  • the third obtaining unit 124 is configured to obtain the SR fed back by the receiving end of the SM+CDD mode, or use hybrid automatic retransmission or automatic weight Transmitting the BER in the current data transmission mode; seventh determining unit
  • the working manners of the foregoing units are combined with each other. See FIG. 8 , and details are not described herein again.
  • a combination of the CINR and each of the above determination schemes may be used to determine whether the 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 9.
  • 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 determine data according to channel state information in the third determining period
  • the transmission rate trend is determined by the eighth determining unit 132, configured to determine, according to the data transmission rate trend, that the CDD mode or the SM+CDD mode is a data transmission mode suitable for the receiving end.
  • the antenna data transmission mode selection scheme can be flexibly selected according to system channel state information (for example, channel conditions and application scenario changes) as a cyclic delay. Diversity and spatial multiplexing cyclic delay diversity are used to transmit data. This increases the stability of the link and increases the throughput of the system.
  • system channel state information for example, channel conditions and application scenario changes
  • Diversity and spatial multiplexing cyclic delay diversity are used to transmit data. This increases the stability of the link and increases the throughput of the system.
  • 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.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

La présente invention se rapporte à un procédé et à un appareil permettant de sélectionner un mode de transmission de données d'antenne. Selon le procédé, une extrémité de transmission détermine le mode de transmission de données adapté pour l'extrémité de réception parmi le mode de diversité de retard cyclique et le mode de multiplexage spatial combiné avec la diversité de retard cyclique, sur la base des informations d'état de canal ; ensuite, l'extrémité de transmission transmet des données en utilisant le mode de transmission de données déterminé. A l'aide de la solution technique proposée par la présente invention, on résout le problème selon lequel la flexibilité en ce qui concerne la sélection du mode de transmission de données parmi le mode de diversité de retard cyclique ou le mode de multiplexage spatial combiné avec la diversité de retard cyclique afin de transmettre des données selon l'état du canal du système ne peut pas être obtenue en raison de l'absence, dans la technique apparentée, de solution permettant de sélectionner le mode de transmission de données parmi le mode de diversité de retard cyclique et le mode de multiplexage spatial combiné avec la diversité de retard cyclique et, par conséquent, la stabilité de la liaison est accrue et le débit du système est amélioré.
PCT/CN2010/073932 2010-04-28 2010-06-13 Procédé et appareil permettant de sélectionner un mode de transmission de données d'antenne WO2011134185A1 (fr)

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CN201010157999.2A CN102237913B (zh) 2010-04-28 2010-04-28 天线数据发送模式的选择方法及装置
CN201010157999.2 2010-04-28

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CN104079385B (zh) * 2013-03-28 2017-11-07 华为终端有限公司 一种调整分集开关的方法及装置
CN115280685A (zh) * 2020-03-16 2022-11-01 高通股份有限公司 天线切换分集或循环延迟分集选择

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CN1489836A (zh) * 2001-10-31 2004-04-14 ���µ�����ҵ��ʽ���� 无线发射装置和无线通信方法
CN101056133A (zh) * 2006-03-15 2007-10-17 华为技术有限公司 正交频分复用系统的多天线发射分集方法及其装置
WO2009017447A2 (fr) * 2007-08-01 2009-02-05 Telefonaktiebolaget L M Ericsson (Publ) Précodage par déplacement de phase basé sur le brouillage pour multiplexage ofdm
US20090279631A1 (en) * 2008-05-06 2009-11-12 Industrial Technology Research Institute Systems and methods for multiple-input multiple-output communications systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1489836A (zh) * 2001-10-31 2004-04-14 ���µ�����ҵ��ʽ���� 无线发射装置和无线通信方法
CN101056133A (zh) * 2006-03-15 2007-10-17 华为技术有限公司 正交频分复用系统的多天线发射分集方法及其装置
WO2009017447A2 (fr) * 2007-08-01 2009-02-05 Telefonaktiebolaget L M Ericsson (Publ) Précodage par déplacement de phase basé sur le brouillage pour multiplexage ofdm
US20090279631A1 (en) * 2008-05-06 2009-11-12 Industrial Technology Research Institute Systems and methods for multiple-input multiple-output communications systems

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CN102237913B (zh) 2015-08-12

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