WO2014121744A1 - Procédé et dispositif de commutation de la formation de faisceau à simple-double courant - Google Patents

Procédé et dispositif de commutation de la formation de faisceau à simple-double courant Download PDF

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WO2014121744A1
WO2014121744A1 PCT/CN2014/071836 CN2014071836W WO2014121744A1 WO 2014121744 A1 WO2014121744 A1 WO 2014121744A1 CN 2014071836 W CN2014071836 W CN 2014071836W WO 2014121744 A1 WO2014121744 A1 WO 2014121744A1
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ratio
threshold
stream
eigenvalue
inter
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PCT/CN2014/071836
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English (en)
Chinese (zh)
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张亚文
刘龙
李琼
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电信科学技术研究院
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Publication of WO2014121744A1 publication Critical patent/WO2014121744A1/fr

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    • 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
    • H04B7/0615—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 weighted versions of same signal
    • H04B7/0617—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 weighted versions of same signal for beam forming

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a single and dual stream beamforming switching method and apparatus. Background of the invention
  • the beamforming of the transmission mode 8 includes single-layer beamforming and dual-layer beamforming, in different transmission environments.
  • Single-flow beamforming and dual-stream beamforming have their own performance advantages; therefore, the base station equipment can switch between single and dual stream beamforming adaptively according to the current transmission environment, so that better transmission performance can be obtained.
  • a selective transmission or a non-selective transmission SRS Sounding Reference Signal
  • SRS Signaling Reference Signal
  • the base station device can obtain complete channel information, and uses the complete channel information to switch between single and dual stream beamforming to obtain better transmission performance. If the SRS is not selectively transmitted, the base station equipment is not able to obtain complete channel information, and only uses channel spectral efficiency to switch between single and dual stream beamforming.
  • the base station device switches between single- and dual-stream beamforming only through channel spectral efficiency.
  • the channel spectral efficiency is greater than the preset threshold
  • the dual-stream beamforming is used, when the channel spectrum efficiency is less than the preset gate.
  • single stream beamforming is used.
  • Embodiments of the present invention provide a single and dual stream beamforming switching method and device to select a better transmission mode and obtain better transmission performance.
  • An embodiment of the present invention provides a single and dual stream beamforming switching method, including: determining, by using the SRS channel estimation, a ratio of inter-stream interference to useful signal power; and using the ratio of the inter-stream interference to the useful signal power to perform a single-dual stream beam Shape switching.
  • An embodiment of the present invention provides a single and dual stream beamforming switching device, including: a first determining module, configured to determine, by using the SRS channel estimation, a ratio of inter-stream interference to useful signal power;
  • a processing module configured to perform single-to-two-stream beamforming switching by using a ratio of the inter-stream interference to a useful signal power.
  • An embodiment of the present invention provides a single and dual stream beamforming switching method, including: determining, by using a sounding reference signal SRS channel estimation, a ratio of a maximum eigenvalue to a second largest eigenvalue of a channel correlation matrix;
  • Single-two-stream beamforming switching is performed by using a ratio of the maximum eigenvalue to the second largest eigenvalue.
  • the embodiment of the invention provides a single and dual stream beamforming switching device, including:
  • a first determining module configured to determine, by using the SRS channel estimation, a ratio of a maximum eigenvalue to a second largest eigenvalue of the channel correlation matrix
  • a processing module configured to perform single and dual stream beamforming switching by using a ratio of the maximum eigenvalue to the second largest eigenvalue.
  • the SRS channel information that is not selectively transmitted (that is, the ratio of the maximum eigenvalue to the second largest eigenvalue obtained by SRS channel estimation and/or the ratio of the inter-stream interference to the useful signal power) is used to perform single and dual stream beams.
  • the switching of the shape makes the selection of the single-double stream beamforming more precise, and ensures that the optimal transmission mode can be selected according to the spectrum efficiency and the channel correlation in time to obtain better system transmission performance.
  • FIG. 1 is a schematic flow chart of a single and dual stream beamforming switching method according to an embodiment of the present invention
  • FIG. 2 is a schematic flow chart of a single and dual stream beamforming switching method according to an embodiment of the present invention
  • FIG. 3 is a schematic flow chart of a single and dual stream beamforming switching method according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart of a single and dual stream beamforming switching method according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a single and dual stream beamforming switching device according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a single and dual stream beamforming switching device according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a single and dual stream beamforming switching device according to an embodiment of the present invention.
  • FIG. 8 is a schematic flow chart of a single and dual stream beamforming switching method according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a single and dual stream beamforming switching device according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a single dual stream beamforming switching device according to an embodiment of the present invention. Mode for carrying out the invention
  • the application scenario of the single and dual stream beamforming switching method provided by the embodiment of the present invention includes but not It is limited to the transmission mode 8 scenario of the LTE system.
  • the single and dual stream beamforming switching is specifically: switching the transmission mode from single stream beamforming to dual stream beamforming, or switching the transmission mode from dual stream beamforming to single stream beamforming, or maintaining transmission.
  • the mode is a dual stream beamforming, or the transmission mode is a single stream beamforming.
  • Single stream beamforming and dual stream beamforming may be single stream beamforming and dual stream beamforming in a transmission mode 8 scenario in an LTE system.
  • FIG. 1 illustrates a single dual stream beamforming switching method, which may include the following steps.
  • Step 101 Determine a ratio of inter-stream interference to useful signal power by using SRS channel estimation.
  • the SRS channel estimation of multiple resources may be used to construct an equivalent channel (which may be in the form of a matrix) of each resource, calculate a correlation matrix of the equivalent channel, and combine the equivalent channel correlation matrices of each resource to obtain a merged
  • the equivalent channel correlation matrix calculating the ratio of the sum of the real parts of the diagonal diagonal elements of the combined equivalent channel correlation matrix to the sum of the main diagonal elements as the ratio of the inter-stream interference to the useful signal power (ie, the dual stream) The ratio of inter-stream interference to useful signal power during transmission).
  • the resources in each example may be subcarriers, resource blocks, and the like.
  • Combining the equivalent channel correlation matrices of each subcarrier may adopt various feasible methods as needed, such as summation (ie, each element in the combined equivalent channel correlation matrix is corresponding in the equivalent channel correlation matrix of each resource) The sum of the elements of the sum), averaging (that is, each element in the combined equivalent channel correlation matrix is the average of the corresponding elements in the equivalent channel correlation matrix of each resource), or other algorithms designed according to needs.
  • the example port is determined by SRS channel estimation; the ratio of inter-stream interference to power of signal may include: bi-beam beamforming vector h, v 2 ] and SRS channel estimation! ⁇ Construct an equivalent channel ⁇ 11 ⁇ ⁇ ⁇ ] (ie part of the downlink equivalent channel), And averaging the correlation matrix of the equivalent channel on the SRS transmission bandwidth to obtain the average equivalent channel correlation moment Array, and determine the ratio of inter-stream interference to useful signal power (ie, the ratio of inter-stream interference to useful signal power during dual-stream transmission) is the sum of the real parts of the diagonally diagonal elements of the average equivalent channel correlation matrix and the main diagonal The ratio of the sum of the line elements.
  • the dimension of the SRS channel estimate h sRs can be
  • the number of SRS transmission ports, ⁇ is the number of uplink receiving antennas.
  • the dimension of the SRS channel estimate ⁇ can be the number of SRS transmission ports, and ⁇ is the number of uplink receiving antennas.
  • the equivalent channel can be constructed as follows:
  • Step 102 Perform single and dual stream beamforming switching by using a ratio of inter-stream interference to useful signal power.
  • the ratio of the inter-stream interference to the useful signal power is greater than or equal to the preset first threshold, it may be determined that single-stream beamforming is used; if the ratio of the inter-stream interference to the useful signal power is less than the first threshold, then it may be determined Further determination is made using dual stream beamforming or using other parameters, such as spectral efficiency.
  • spectral efficiency can be utilized for further determination. If the spectral efficiency is greater than or equal to the preset third threshold, then dual stream beamforming can be used; if the spectral efficiency is less than the third threshold, single stream beamforming can be used.
  • the value of the first threshold can be set to a value greater than or equal to 0.6, such as 0.6, 0.65, 0.7, 0.8, 0.9, 1, etc.
  • 0.6 0.65
  • 0.7 0.65
  • 0.8 0.0.9
  • the ratio of inter-stream interference to useful signal power is greater than or equal to 0.6, indicating that the channel correlation is strong at this time
  • single-flow beamforming can be used; if the ratio of inter-stream interference to useful signal power is less than 0.6, It can then be determined by using dual stream beamforming or by using other parameters, such as spectral efficiency, for further determination.
  • the current transmission mode is single-flow beamforming
  • the ratio of inter-stream interference to useful signal power is greater than the first threshold, then the channel correlation is strong and a single-stream beamforming transmission is required. Therefore, it is necessary to keep the transmission mode as a single stream beamforming.
  • the current transmission mode is dual-stream beamforming
  • the ratio of inter-stream interference to useful signal power is greater than the first threshold, then the channel correlation is strong and a single-stream beamforming transmission is required. It is therefore necessary to switch the transmission mode from dual stream beamforming to single stream beamforming.
  • the second threshold may be less than or equal to the first threshold.
  • FIG. 2 shows a single dual stream beamforming switching method, which may include the following steps.
  • Step 201 Determine, by using SRS channel estimation, a ratio of a maximum eigenvalue to a second largest eigenvalue.
  • the maximum eigenvalue and the second largest eigenvalue refer to the largest eigenvalue and the second largest eigenvalue of the channel correlation matrix.
  • the channel correlation matrix of each resource may be calculated by using SRS channel estimation of multiple resources, and the channel correlation matrix of each resource is combined to obtain a combined channel correlation matrix, and the combined channel correlation matrix is subjected to eigenvalue decomposition. The maximum eigenvalue and the second largest eigenvalue are obtained, thereby obtaining a ratio of the largest eigenvalue to the second largest eigenvalue.
  • the resources in each example may be subcarriers, data blocks, and the like.
  • Combining the channel correlation matrices of the resources may adopt various feasible methods as needed, such as summation (that is, each element in the combined channel correlation matrix is the sum of the corresponding elements in the channel correlation matrix of each resource), Averaging (ie, each element in the combined channel correlation matrix is the average of the corresponding elements in the channel correlation matrix of each resource), or other algorithms designed as needed.
  • the ratio of the maximum eigenvalue to the sub-large eigenvalue ie, the ratio of the primary and secondary eigenvalues
  • ⁇ is the number of uplink receiving antennas.
  • Step 202 using SRS channel estimation to determine a ratio of inter-stream interference to useful signal power.
  • the manner of determining the ratio of the inter-stream interference to the useful signal power by using the SRS channel estimation is the same as that described above, and will not be described again.
  • Step 203 Perform single- and dual-stream beamforming switching by using a ratio of a maximum eigenvalue to a second largest eigenvalue and a ratio of inter-stream interference to useful signal power.
  • single-flow beamforming may be employed; if the ratio of inter-stream interference to useful signal power is less than a preset second threshold, and the maximum eigenvalue If the ratio of the second largest eigenvalue is greater than the preset fourth threshold, the dual stream beamforming is adopted; if the ratio of the inter-stream interference to the useful signal power is less than the preset second threshold, and the maximum eigenvalue and the second largest eigenvalue are If the ratio is less than or equal to the preset fourth threshold, a single stream beamforming is employed.
  • the current transmission mode is single-flow beamforming
  • the ratio of the inter-stream interference to the useful signal power is less than the second threshold, and the ratio of the maximum eigenvalue to the second largest eigenvalue is greater than the fourth threshold, then the channel correlation is indicated at this time. It is weak and requires dual-stream beamforming transmission. Therefore, it is necessary to switch the transmission mode from single-stream beamforming to dual-stream beamforming.
  • the channel correlation is compared. Weak, need to carry out dual-stream beamforming transmission, so it is necessary to keep the transmission mode into dual-stream beamforming.
  • the spectral efficiency may be used to determine whether Perform single and dual stream beamforming switching. For example, if the spectral efficiency is greater than the preset third threshold, dual stream beamforming is employed; if the spectral efficiency is less than the third threshold, single stream beamforming is employed.
  • the transmission mode is single-flow beamforming, if the ratio of the inter-stream interference to the useful signal power is greater than the second threshold and less than the first threshold, and/or, the ratio of the maximum eigenvalue to the second largest eigenvalue is less than the fourth threshold. , then the channel correlation is strong at this time, and it needs to be judged by spectrum efficiency. If the spectral efficiency is greater than the third threshold, the transmission mode is switched from single-stream beamforming to dual-stream beamforming; if the spectral efficiency is less than the third threshold, the transmission mode is maintained as a single-stream beamforming.
  • the current transmission mode is dual-stream beamforming
  • the ratio of the inter-stream interference to the useful signal power is greater than the second threshold and less than the first threshold, and/or the ratio of the maximum eigenvalue to the second largest eigenvalue is less than the fourth threshold, Therefore, the channel correlation is strong at this time, and needs to be judged by spectrum efficiency; further, if the spectrum efficiency is greater than the third threshold, the transmission mode is maintained as a dual-flow beamforming, and if the spectrum efficiency is less than the third threshold, the transmission is transmitted. Dual-wave The beam shaping is switched to a single stream beamforming.
  • the ratio of the inter-stream interference to the useful signal power is greater than the preset second threshold and less than the preset first threshold, and/or the ratio of the maximum eigenvalue to the second largest eigenvalue is less than the fourth threshold, including: 1) The ratio of the maximum eigenvalue to the second largest eigenvalue is greater than the fourth threshold, and the ratio of the inter-stream interference to the useful signal power is greater than a preset second threshold and less than the first threshold; (2) the maximum eigenvalue and the second largest eigenvalue The ratio is less than the fourth threshold, the ratio of the inter-stream interference to the useful signal power is greater than the second threshold and less than the first threshold; (3) the ratio of the maximum eigenvalue to the second largest eigenvalue is less than the fourth threshold, inter-stream interference and useful signal power The ratio is less than the second threshold.
  • the parameter may be the number of times the spectral efficiency of the channel is greater than the third threshold, the frequency efficiency of the channel is less than the third threshold, the ratio of the maximum eigenvalue to the second largest eigenvalue is greater than the fourth threshold, the maximum eigenvalue and the second largest feature.
  • the ratio of values is less than the number of fourth thresholds, and so on.
  • the spectral efficiency of the required channel is continuously M1 times greater than the third threshold; when transmission mode 8 is switched from dual-stream beamforming to single-stream beamforming
  • the spectral efficiency of the required channel is continuously less than the third threshold for M2 times. For example, when judging the channel correlation, it is necessary to satisfy that the ratio of the maximum eigenvalue to the sub-large eigenvalue of more than half is greater than the preset fourth threshold within the statistical duration.
  • the channel efficiency is determined based on the spectrum efficiency of the channel, and the channel correlation is determined. That is, the non-selectively transmitted SRS channel information (the ratio of the maximum eigenvalue to the second largest eigenvalue and/or the ratio of the inter-stream interference to the useful signal power) is used to perform single-two-stream beamforming switching, so that the single-dual stream beamforming The choice is more precise, and it is guaranteed to select the optimal transmission mode according to the spectrum efficiency and channel correlation, and get better. System transfer performance.
  • the single dual stream beamforming switching method may include the following steps.
  • Step 301 Determine, by using SRS channel estimation, a ratio of a maximum eigenvalue to a second largest eigenvalue.
  • the method for determining the ratio of the maximum eigenvalue to the second largest eigenvalue by using the SRS channel estimation may adopt the foregoing method, or other methods.
  • Step 302 using SRS channel estimation to determine a ratio of inter-stream interference to useful signal power.
  • the method for determining the ratio of the inter-stream interference to the useful signal power by using the SRS channel estimation may adopt the method described above, or other methods.
  • Step 303 Determine whether a ratio of inter-stream interference to useful signal power is greater than a preset first threshold; if yes, perform step 307; if no, perform step 304.
  • Step 304 Determine whether the ratio of the inter-stream interference to the useful signal power is less than a preset second threshold, and the ratio of the maximum eigenvalue to the second largest eigenvalue is greater than a preset fourth threshold; if yes, perform step 305; Otherwise, step 306 is performed.
  • Step 305 Switch the transmission mode from single stream beamforming to dual stream beamforming.
  • Step 306 Determine whether the spectrum efficiency is greater than a preset third threshold; if yes, execute step 305; if no, perform step 307.
  • the ratio of the inter-stream interference to the useful signal power is greater than the second threshold and less than the first threshold, and/or, if the ratio of the maximum eigenvalue to the second largest eigenvalue is less than the fourth threshold, In this step, if the spectrum efficiency is greater than the third threshold, the transmission mode is switched from single-flow beamforming to dual-stream beamforming, that is, step 305 is performed; if the spectrum efficiency is less than the third threshold, the transmission mode is kept as a single-flow beam. Forming, that is, performing step 307.
  • Step 307 maintaining the transmission mode as a single stream beamforming.
  • the channel correlation condition is determined, that is, the non-selectively transmitted SRS channel information (the ratio of the largest eigenvalue to the second largest eigenvalue) / or the ratio of inter-stream interference to the useful signal power) to switch between single and dual stream beamforming, so that the selection of single and dual stream beamforming is more precise, and the optimal transmission mode can be selected according to the spectrum efficiency and channel correlation. Get better system transfer performance.
  • the single dual stream beamforming switching method may include the following steps.
  • Step 401 Determine, by using SRS channel estimation, a ratio of a maximum eigenvalue to a second largest eigenvalue.
  • the method for determining the ratio of the maximum eigenvalue to the second largest eigenvalue by using the SRS channel estimation may adopt the foregoing method, or other methods.
  • Step 402 using SRS channel estimation to determine a ratio of inter-stream interference to useful signal power.
  • the method for determining the ratio of the inter-stream interference to the useful signal power by using the SRS channel estimation may adopt the method described above, or other methods.
  • Step 403 Determine whether a ratio of inter-stream interference to useful signal power is greater than a preset first threshold; if yes, perform step 407; if no, perform step 404.
  • Step 404 Determine whether the ratio of the inter-stream interference to the useful signal power is less than a preset second threshold, and the ratio of the maximum eigenvalue to the second largest eigenvalue is greater than a preset fourth threshold; if yes, perform step 405; Otherwise, step 406 is performed.
  • Step 405 Keep the transmission mode into a dual stream beamforming.
  • Step 406 Determine whether the spectrum efficiency is greater than a preset third threshold; if yes, execute step 405; if no, perform step 407.
  • the ratio of the inter-stream interference to the useful signal power is greater than the second threshold and less than the first threshold, and/or, if the ratio of the maximum eigenvalue to the second largest eigenvalue is less than the fourth threshold, In this step, if the spectrum efficiency is greater than the third threshold, then The transmission mode is a two-stream beamforming, that is, step 405 is performed; if the spectrum efficiency is less than the third threshold, the transmission mode is switched from dual-stream beamforming to single-stream beamforming, that is, step 407 is performed.
  • Step 407 Switch the transmission mode from dual stream beamforming to single stream beamforming.
  • the channel efficiency is determined based on the spectrum efficiency of the channel, and the channel correlation is determined. That is, the non-selectively transmitted SRS channel information (the ratio of the maximum eigenvalue to the second largest eigenvalue and/or the ratio of the inter-stream interference to the useful signal power) is used to perform single-two-stream beamforming switching, so that the single-dual stream beamforming The choice is more precise, and it is guaranteed to select the optimal transmission mode according to the spectrum efficiency and channel correlation to obtain better system transmission performance.
  • the embodiment of the present invention further provides a single dual stream beamforming switching device (ie, a base station device).
  • the device includes: a first determining module 11 configured to determine, by using the SRS channel estimation, a ratio of inter-stream interference to useful signal power;
  • the processing module 13 is configured to perform single-pair beamforming switching by using the ratio of the inter-stream interference to the useful signal power.
  • the first determining module 11 may construct an equivalent channel (which may be in the form of a matrix) of each subcarrier by using SRS channel estimation of each subcarrier, calculate a correlation matrix of the equivalent channel, and use an equivalent channel of each subcarrier.
  • the correlation matrix is combined to obtain the combined equivalent channel correlation matrix, and the ratio of the sum of the real parts of the diagonal diagonal elements of the combined equivalent channel correlation matrix to the sum of the main diagonal elements is calculated as inter-stream interference and useful
  • the ratio of signal power ie, the ratio of inter-stream interference to useful signal power during dual-stream transmission).
  • the first determining module 11 may combine the equivalent channel correlation matrices of each subcarrier according to various feasible manners, such as summation (ie, the combined equivalent channel correlation matrix). Each element in the sum is the sum of the corresponding elements in the equivalent channel correlation matrix of each subcarrier), and is averaged (that is, each element in the combined equivalent channel correlation matrix is an equivalent channel correlation matrix of each subcarrier) The average of the corresponding elements), or other algorithms designed as needed.
  • summation ie, the combined equivalent channel correlation matrix.
  • the first determining module 11 may construct an equivalent channel [ ⁇ 11 ⁇ * ⁇ ] (ie, a partial downlink equivalent channel) using the dual-stream beamforming vector [ V1 , v2 ] and the SRS channel estimation hs, and calculate an equivalent channel.
  • Correlation matrix R ⁇ r ⁇ A] and average the correlation matrix of the equivalent channel on the SRS transmission bandwidth to obtain an average equivalent channel correlation matrix, and determine the ratio of inter-stream interference to useful signal power (ie, dual-stream transmission)
  • the ratio of the inter-stream interference to the useful signal power is the ratio of the sum of the real parts of the diagonal diagonal elements of the average equivalent channel correlation matrix to the sum of the main diagonal elements.
  • the processing module 13 may be configured to determine, when the ratio of the inter-stream interference to the useful signal power is greater than a preset first threshold, using a single-flow beamforming; when the ratio of the inter-stream interference to the useful signal power is less than or equal to the first gate For limited time, it is determined to use dual stream beamforming.
  • processing module 13 determines that the beamforming mode to be used is consistent with the beamforming mode currently being used, it is determined that no single-flow beamforming switching is required; if the processing module 13 determines the beamforming mode to be used and the current When the methods being used are inconsistent, it is determined that single-flow beamforming switching is required.
  • the processing module 13 determines that the ratio of the inter-stream interference to the useful signal power is greater than the first threshold, it is determined that the transmission mode is a single-stream beam shaping.
  • the processing module 13 determines that the ratio of the inter-stream interference to the useful signal power is greater than the first threshold, it is determined to switch the transmission mode from dual-stream beamforming to single-stream beamforming.
  • the processing module 13 can also be used to: if inter-stream interference and useful signal work If the ratio of the rate is less than or equal to the second threshold, the spectral efficiency is used for further determination; if the spectral efficiency is greater than the preset third threshold, then the dual-flow beamforming is determined; if the spectral efficiency is less than the third threshold, then Determine the use of single stream beamforming. If it is determined that the beamforming mode to be used is consistent with the beamforming mode currently being used, it is determined that no handover is required; if it is determined that the beamforming mode to be used is inconsistent with the beamforming mode currently being used, then it is determined Single stream beamforming switching is performed.
  • the second threshold may be less than or equal to the first threshold.
  • the device may further include: a second determining module 12, configured to determine, by using the sounding reference signal SRS channel estimation, a ratio of a maximum eigenvalue to a second largest eigenvalue.
  • a second determining module 12 configured to determine, by using the sounding reference signal SRS channel estimation, a ratio of a maximum eigenvalue to a second largest eigenvalue.
  • the processing module 13 is configured to perform single-and dual-flow beamforming switching by using a ratio of the maximum eigenvalue to the second largest eigenvalue and a ratio of the inter-stream interference to the useful signal power.
  • the second determining module 12 may calculate a channel correlation matrix of each subcarrier by using SRS channel estimation of each subcarrier, and combine channel referencing matrices of each subcarrier to obtain a combined channel correlation matrix, and after combining
  • the channel correlation matrix performs eigenvalue decomposition to obtain a maximum eigenvalue and a sub-large eigenvalue, thereby obtaining a ratio of the largest eigenvalue to the second largest eigenvalue.
  • the second determining module 12 may combine the channel correlation matrices of each subcarrier according to various feasible manners, for example, summation (that is, each element in the combined channel correlation matrix is a corresponding channel correlation matrix of each subcarrier. The sum of the elements is summed), averaging (ie, each element in the combined channel correlation matrix is the average of the corresponding elements in the channel correlation matrix of each subcarrier), or other algorithms designed as needed.
  • the average correlation matrix performs eigenvalue decomposition to obtain the maximum eigenvalue and the sub-large eigenvalue; determining the ratio of the largest eigenvalue to the sub-large eigenvalue (ie, the primary and secondary eigenvalues) Ratio of values).
  • RS is a matrix of size
  • « is the number of uplink receiving antennas. .
  • the processing module 13 may determine to adopt single-flow beamforming when the ratio of inter-stream interference to useful signal power is greater than a preset first threshold; and the ratio of inter-stream interference to useful signal power is less than a preset second threshold And when the ratio of the maximum eigenvalue to the second largest eigenvalue is greater than the preset fourth threshold, it is determined that the dual stream beamforming is used.
  • the processing module 13 determines that the beamforming mode to be used is consistent with the beamforming mode currently being used, it is determined that no single-beam beamforming switching is required; determining the beamforming mode to be used and the beam currently being used When the shaping methods are inconsistent, it is determined that single-flow beamforming switching is required.
  • the processing module 13 is configured to: when the current transmission mode is a single-flow beamforming, if the ratio of the inter-stream interference to the useful signal power is greater than the first threshold, maintaining the transmission mode as a single-flow beamforming;
  • the transmission mode is switched from dual-stream beamforming to single-stream beamforming.
  • the processing module 13 is configured to: when the current transmission mode is a single-flow beamforming, if the ratio of the inter-stream interference to the useful signal power is less than a preset second threshold, and the ratio of the maximum eigenvalue to the second largest eigenvalue is greater than The fourth threshold, the transmission mode is switched from single stream beamforming to dual stream beamforming;
  • the transmission mode is maintained as Dual stream beamforming.
  • the processing module 13 is configured to: when the current transmission mode is a single-flow beamforming, if the ratio of the inter-stream interference to the useful signal power is greater than a second threshold and less than the first threshold, and/or The ratio of the maximum eigenvalue to the second largest eigenvalue is less than the fourth threshold, then When the spectrum efficiency is greater than the preset third threshold, the transmission mode is switched from single stream beamforming to dual stream beamforming. When the spectrum efficiency is less than the third threshold, the transmission mode is maintained as a single stream beamforming;
  • the current transmission mode is dual-stream beamforming
  • the ratio of the inter-stream interference to the useful signal power is greater than the second threshold and less than the first threshold, and/or, the ratio of the maximum eigenvalue to the second largest eigenvalue is less than
  • the fourth threshold when the spectral efficiency is greater than the third threshold, keeps the transmission mode as dual-stream beamforming, and when the spectral efficiency is less than the third threshold, the transmission mode is switched from dual-stream beamforming to single-stream beamforming.
  • the single-flow beamforming and the dual-stream beamforming specifically include: single-stream beamforming and dual-stream beamforming in a transmission mode 8 scenario in a long-term evolution LTE system.
  • a single dual stream beamforming switching device may include: a CPU, a memory, and an internal bus.
  • the memory includes a first determining module 21 and a processing module 23.
  • the first determining module 21 and the processing module 23 include machine readable instructions, which enable the CPU to implement the functions of the first determining module 11 and the processing module 13, and are not described herein again.
  • the internal bus is used to implement communication between modules, and may be a bus connecting each module or a collection of lines between multiple modules.
  • FIG. 8 shows a single dual stream beamforming switching method, which may include the following steps.
  • Step 501 Determine, by using SRS channel estimation, a ratio of a maximum eigenvalue to a second largest eigenvalue.
  • the maximum eigenvalue and the second largest eigenvalue refer to the largest eigenvalue and the second largest eigenvalue of the channel correlation matrix.
  • the channel correlation matrix of each resource may be calculated by using SRS channel estimation of multiple resources, and the channel correlation matrix of each resource is combined to obtain a combined channel correlation matrix, and the combined channel correlation matrix is subjected to eigenvalue decomposition. Get the largest eigenvalue and the second largest The eigenvalues are obtained such that the ratio of the largest eigenvalue to the second largest eigenvalue is obtained.
  • the resources in each example may be subcarriers, data blocks, and the like.
  • Combining the channel correlation matrices of the resources may adopt various feasible methods as needed, such as summation (that is, each element in the combined channel correlation matrix is the sum of the corresponding elements in the channel correlation matrix of each resource), Averaging (ie, each element in the combined channel correlation matrix is the average of the corresponding elements in the channel correlation matrix of each resource), or other algorithms designed as needed.
  • Step 502 Perform single-to-two-stream beamforming switching by using a ratio of a maximum eigenvalue to a second largest eigenvalue.
  • a single stream beamforming may be used; if the ratio of the largest eigenvalue to the second largest eigenvalue is greater than or equal to the fifth threshold, It can then be determined by using dual stream beamforming or by using other parameters, such as spectral efficiency, for further determination. For example, at this time, if the spectral efficiency is greater than or equal to the preset sixth threshold, dual-stream beamforming can be used; if the spectral efficiency is less than the sixth threshold, single-flow beamforming can be employed.
  • the ratio of the maximum eigenvalue to the second largest eigenvalue is greater than or equal to the preset fifth threshold, and the spectral efficiency is greater than or equal to the preset sixth threshold, then dual-stream beamforming may be used; If the ratio of the largest eigenvalue to the second largest eigenvalue is less than the fifth threshold, and/or the spectral efficiency is less than the sixth threshold, a single stream beamforming may be employed.
  • the value of the fifth threshold can be set to a value greater than or equal to 5 (integer or decimal), such as 5, 6, 7, 8, 9, 10, 15, 20, and so on.
  • 5 integer or decimal
  • the ratio of the maximum eigenvalue to the second largest eigenvalue is less than 6, it can be determined that single stream beamforming is used;
  • the ratio of the eigenvalue to the next largest eigenvalue is greater than or equal to 6, it can be determined that the dual stream beamforming is used or other parameters, such as spectral efficiency, are used for further determination.
  • the device includes:
  • a first determining module 31 configured to determine, by using the SRS channel estimation, a ratio of a maximum eigenvalue to a second largest eigenvalue of the channel correlation matrix
  • the processing module 33 is configured to perform single-pair beamforming switching by using a ratio of the maximum eigenvalue to the second largest eigenvalue.
  • the first determining module 31 may determine the ratio of the maximum eigenvalue to the next largest eigenvalue using the method described in the above step 501.
  • the processing module 33 performs single and dual stream beamforming switching using the method described in the above step 502.
  • a single dual stream beamforming switching device can include: a CPU, a memory, and an internal bus.
  • the memory includes a first determining module 41 and a processing module 43.
  • the first determining module 41 and the processing module 43 include machine readable instructions, which enable the CPU to implement the functions of the first determining module 31 and the processing module 33, and details are not described herein.
  • the internal bus is used to implement communication between modules, and may be a bus connecting each module or a collection of lines between multiple modules.
  • the modules of the device of the present invention may be integrated into one or may be deployed separately.
  • the above modules can be combined into one module, or can be further split into multiple sub-modules.
  • the channel efficiency is determined based on the spectrum efficiency of the channel, and the channel correlation is determined. That is, the non-selectively transmitted SRS channel information (the ratio of the maximum eigenvalue to the second largest eigenvalue and/or the ratio of the inter-stream interference to the useful signal power) is used to perform single-two-stream beamforming switching, so that the single-dual stream beamforming Choose more precise and guaranteed It is possible to select an optimal transmission mode in time according to spectral efficiency and channel correlation to obtain better system transmission performance.
  • the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for making a A computer device (which may be a personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the embodiment, or may be changed in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.
  • the hardware modules in the embodiments may be implemented in a hardware manner or a hardware platform plus software.
  • the above software includes machine readable instructions stored in a non-volatile storage medium.
  • embodiments can also be embodied as software products.
  • the hardware may be implemented by specialized hardware or hardware that executes machine readable instructions. Such as FPGA or ASIC) is used to perform specific operations.
  • the hardware may also include programmable logic devices or circuits (such as including general purpose processors or other programmable processors) that are temporarily configured by software for performing particular operations.
  • the machine readable instructions corresponding to modules 21-23 in FIG. 7 and modules 41 and 43 in FIG. 10 may cause an operating system or the like operating on a computer to perform some or all of the operations described herein. Work.
  • the non-transitory computer readable storage medium may be inserted into a memory provided in an expansion board within the computer or written to a memory provided in an expansion unit connected to the computer.
  • the CPU or the like installed on the expansion board or the expansion unit can perform part and all of the actual operations according to the instructions.
  • Non-volatile computer readable storage media include floppy disks, hard disks, magneto-optical disks, optical disks (eg,
  • the program code can be downloaded from the server computer by the communication network.

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

Abstract

La présente invention concerne un procédé et un dispositif de commutation de la formation de faisceau à simple-double courant. Le procédé consiste à déterminer un rapport entre le brouillage entre courants et la puissance disponible du signal au moyen d'une estimation de canal SRS, et à effectuer une commutation de la formation de faisceau à simple-double courant au moyen du rapport entre le brouillage entre courants et la puissance disponible du signal
PCT/CN2014/071836 2013-02-07 2014-01-30 Procédé et dispositif de commutation de la formation de faisceau à simple-double courant WO2014121744A1 (fr)

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CN105115592B (zh) * 2015-09-02 2018-02-16 东莞市中光通信科技有限公司 颅腔振动检测方法及装置
CN106656290A (zh) * 2015-10-28 2017-05-10 中兴通讯股份有限公司 一种两流功率注水方法、装置及基站

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