Method for determining precoding matrix, related equipment and communication system

Abstract

A precoding matrix determination method, a related device and communications system. A precoding matrix determination method may comprise: a wireless coordinated transmission point obtaining, according to an uplink reference signal sent by a terminal device, a first signal transmission time delay between the terminal device and the wireless coordinated transmission point and a first downlink channel state information estimation value corresponding to the terminal device on N resources; determining, according to the first downlink channel state information estimation value corresponding to the terminal device on the N resources, X resources scheduled to the terminal device; generating a first recoding matrix corresponding to each resource, according to the first downlink channel state information estimation value corresponding to the terminal device on each resource among the X resources; obtaining a time delay difference between the first signal transmission time delay and a reference transmission time delay; and performing time delay difference compensation on the first precoding matrix corresponding to each resource among the generated X resources by using the time delay difference. The solutions of the embodiments of the present invention help to improve the transmission performance of multipoint coordination.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a method for determining a precoding matrix, related equipment and a communication system. Background technique [0002] In order to improve coverage for cell edge users, further increase system capacity, especially improve edge user transmission capabilities, research on Coordinated Multiple Point (CoMP, Coordinated multiple point) technology has been launched in the industry. Through sufficient research and demonstration, the CoMP technology has been prepared to be formally introduced into the LTE standardization work as an important key technology supporting the subsequent evolution of the Long Term Evolution (LTE, Long Term Evolution) system. [0003] The core idea of ​​CoMP is to use multiple geographically adjacent wireless transmission points to provide data transmission for a specific terminal device cooperatively or to receive and process data from a specif...

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Problems solved by technology

[0004] Since the CoMP technology needs to utilize multiple wireless cooperative transmission points separated geographically, and the distances from terminal devices to different wireless cooperative transmission points may vary, therefore, even if clock synchronization is achieved among all wireless transmission points, the There may still be differences in the time it takes for the data sent by the wireless transmission point to reach the terminal device

However, the existing Time Division Duplexing (TDD, Time Division Duplexing) system does not effectively solve the problem of transmission delay difference between wireless cooperative transmission points, which affects the performance of multi-point coordination to a certain extent.

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