Feedback method and device for precoding matrix indication

Abstract

The invention discloses a feedback and receiving method for precoding matrix indication, and a terminal device. The feedback method comprises the following steps of: determining a rank indication (101), determining a precoding matrix in a precoding matrix set corresponding to the rank indication (102), a first precoding matrix indication, a second precoding matrix indication, and a third precodingmatrix indication of thousands of indication precoding matrixes are determined (103), and the UE sends a rank and the first precoding matrix indication, the second precoding matrix indication, and the third precoding matrix indication to the base station (104). Through the first-stage feedback and the second-stage feedback, the number of vectors to be selected is greatly reduced, so that the complexity of calculating the third-stage feedback is reduced, and meanwhile, the number of bits fed back by the third stage is reduced. Under the condition that the system performance requirement is met,the bit number indicated by the fed-back pre-coding matrix is reduced, and the balance between the system performance and the feedback overhead of the terminal device is realized.

Description

technical field [0001] The present application relates to the field of mobile communication, in particular to the multi-antenna technology in the wireless communication system. Background technique [0002] A long term evolution (long term evolution, LTE) system widely adopts a multiple input and multiple output (multiple input and multiple output, MIMO) technology. The sending end may process the data by using a precoding (precoding) technology, so as to improve the quality or rate of signal transmission. The sending end may be a base station or a terminal device. [0003] In the LTE system, the base station generally acquires the precoding matrix by feeding back a precoding matrix indicator (precoding matrix indicator, PMI) from the terminal equipment. The set of used precoding matrices is usually called a codebook or a set of codebooks. Each precoding matrix in a codebook or set of codebooks may also be called a codeword. [0004] The terminal equipment quantizes chan...

AI Technical Summary

Problems solved by technology

[0008] If the current codebook feedback mechanism is still used in the case of 32 antenna ports, that is, the vector group fed back by the first stage contains 4 vectors, it will inevitably affect the coverage bandwidth and cause the performance of the codebook to decline

[0009] If the number of vectors for the first-level feedback is increased to 16, then the second-level feedback needs to be selected among these 16 vectors, which will increase the number of bits for the second-level feedback, thereby increasing the system overhead of the terminal device

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