Feedback method of precoding matrix instruction, receiving end and transmitting end

Abstract

The invention provides a feedback method of precoding matrix instruction, a receiving end and a transmitting end. The method comprises the following steps: the receiving end selects a precoding matrixW from a codebook based on a reference signal, wherein the matrix is as shown in description, theta1 and theta2 respectively represent phase difference, for the transmitting signal weight value of the same transmitting layer, of two adjacent antennas in the first antenna group and the second antenna group of the transmitting end, the Phin represents the phase difference, for the signal weight value of the same transmitting layer, of the first antenna group and the second antenna, and Phin is as shown in description, M is positive integer, n is non-negative integer less than M, the theta1 andtheta2 of at least one precoding matrix in the codebook are different, and the first antenna group and the second antenna group belong to the same multi-antenna system; and the receiving end sends a precoding matrix instruction PMI to the transmitting end. Therefore, the weak correlation of the antenna can be guaranteed, the precision of the precoding is effectively improved, the performance lossis reduced, and the system throughput is improved.

Description

technical field [0001] Embodiments of the present invention relate to the field of wireless communication, and more specifically, relate to a feedback method, a receiving end, and a transmitting end of a precoding matrix indication. Background technique [0002] Through the transmit precoding technique and the receive combining technique, a multiple input multiple output (Multiple Input Multiple Output, MIMO) wireless communication system can obtain diversity and array gain. A system utilizing precoding can be expressed as [0003] [0004] where y is the received signal vector, H is the channel matrix, is the precoding matrix, s is the transmitted symbol vector, and n is the measurement noise. [0005] Optimal precoding usually requires the transmitter to be fully aware of Channel State Information (CSI). A common method is that the user equipment (User Equipment, UE) quantifies the instantaneous CSI and reports it to the base station, where the user equipment includ...

AI Technical Summary

Problems solved by technology

However, as the distance between two antennas in the same polarization direction increases, the correlation between the antennas gradually weakens, while the phase difference of the antenna elements in the codebook based on the strong correlation characteristics between the antennas remains consistent

Therefore, the existing codebook design is not suitable for the scenario where the antenna configuration with a large distance is applied, resulting in a reduction in the accuracy of the precoding performed by the base station based on the PMI information fed back by the UE, resulting in a large performance loss and reduced system throughput. quantity

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