Feedback method of weight matrix and related device and system

Abstract

The embodiment of the invention discloses a feedback method of a weight matrix and the related device and system so as to reduce the feedback overhead of beam forming. The method provided by the embodiment of the invention comprises the steps: (1) an STA sends the beam forming ability information of a terminal to an AP (access point), and the beam forming ability information comprises the beam forming based on a weight matrix set form supported by the terminal and a largest supported beam forming antenna number, (2) the terminal receives weight matrix set information fed back by the access point according to the beam forming ability information, and the weight matrix set information comprises a plurality of preset weight matrices and the ID numbers which carry out unique marking on each weight matrix, (3) the terminal carries out channel estimation according to data package sent by the access point to obtain an CSI, (4) the terminal selects weight matrices from the weight matrix set information respectively for each OFDM subcarrier according to the CSI obtained through estimation, and (5) the terminal feeds the ID number corresponding to the weight matrix selected for each OFDM subcarrier to the access point.

Description

technical field [0001] The present invention relates to the technical field of communication, and in particular to a weight matrix feedback method and a related device and system. Background technique [0002] Multiple-Input Multiple-Output (MIMO, Multiple-Input Multiple-Output) systems can use beamforming technology (Beam forming), which can effectively improve system performance by performing weighted processing on digital baseband signals to be transmitted. Currently, the 802.11n and 802.11ac standards have adopted this technology, and the 802.11ah standard will also adopt this technology. [0003] The beamforming technology usually uses multiple weight values ​​when weighting the digital baseband channel. Multiple weight values ​​form a weight matrix. The weight values ​​are derived and calculated from channel state information (CSI, Channel StateInformation). For example, for The weight matrix can be obtained by performing singular value decomposition (SVD, Singular va...

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Problems solved by technology

[0016] In the process of realizing the present invention, the inventors of the present invention found that the CSI direct feedback method and the weight matrix feedback method in the 802.11n standard lead to relatively large feedback overhead due to the direct feedback of the CSI matrix or weight matrix. 802.11 The weight matrix compression feedback method in the n standard and the 802.11ac standard reduces the feedback overhead compared to the first two, but if the weight matrix compression feedback method is applied to the 802.11ah standard, the feedback overhead is still large, because the 802.11ah standard The communication rate is relatively low, mainly used in low-power application scenarios, and the communication data packets are not long. If 802.11ah continues to use the existing 802.11n / ac weight matrix compression feedback method, the feedback overhead is relatively large, which reduces the communication efficiency of the system ; For the weight matrix compression feedback method for single-antenna reception in the current 802.11ah standard, the effect of halving the amount of feedback information can be achieved only for single-antenna reception, but for non-single-antenna reception in MIMO systems Situation: 2×2, 3×2, 4×2…, the amount of beamforming feedback information is still relatively large

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