Multi-user-MIMO-based method and apparatus for determining precoding

Abstract

The invention discloses a multi-user-MIMO-based method and apparatus for determining precoding. The method comprises: information of a plurality of sub channels of a user is obtained; according to a correlation value among information of multiple sub channels of the user, the multiple sub channels of the user are divided into n sub channel classification sets, wherein a correlation value of a first sub channel in the sub channel classification sets and other sub channels is smaller than a correlation threshold value and the sub channel classification sets include a first sub channel and a second sub channel whose correlation value with the first sub channel is smaller than a correlation threshold value; and for each of the n sub channel classification sets of the user, a precoding matrix corresponding to the sub channel classification set is determined. The multiple sub channels of the user are divided into n sub channel classification sets, so that calculation complexity of correlation between sub channels is simplified; and because calculation of a precoding matrix for each sub channel is not required, the operation complexity during precoding obtaining is reduced.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for determining precoding based on multi-user MIMO. Background technique [0002] Multi-User MIMO (Multi User-Multiple Input Multiple Output, MU-MIMO, multi-user multiple-input multiple-output technology) technology uses different users to use the same resources for transmission, thereby increasing system throughput and improving spectrum utilization. The downlink MU-MIMO has mainly gone through three stages in the 3GPP (The 3rd Generation Partnership Project, third generation partnership project) agreement. Multi-user MIMO in LTE (Long Term Evolution, Long Term Evolution) R8, the user is in the multi-user MIMO state through semi-static high-level configuration, supports MU-MIMO for up to two users, and each user has only one layer (spatial layer) . A transmission mode 8 (TransportMode 8, TM8) is introduced in the standard of the LTE R9 versio...

AI Technical Summary

Problems solved by technology

However, these algorithms are mainly applied to flat fading channels, but in practical applications, the channels are mostly frequency selective fading channels

In the prior art, it is proposed to treat multiple fading channels as multiple parallel flat fading channels for calculation, that is to say, each carrier is calculated once. Although this method can obtain good performance, its computational complexity is quite high

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