Base station terminal signal interference noise ratio estimation method for coordinated multipoint transmission system

Abstract

The invention provides a base station terminal signal interference noise ratio estimation method for a coordinated multipoint transmission system. The method comprises the steps of firstly, receiving feedback information of users by a base station terminal, wherein the feedback information comprises code words, joint channel quantitative accuracy, joint channel module values and the energy sum of noise and collaborative cluster outer interference; then reconstructing a joint channel of each user, selecting service users, distributing received power between the service users, and calculating the vector quantity of precoding; for each service user, estimating interfering energy of each service user by other users by solving convex optimization problems, and estimating the signal interference noise ratio of downlink transmission of each user; finally, selecting a modulation coding mode for each service user by the base station terminal according to the estimated signal interference noise ratio, and conducting downlink transmission. According to the method, the channel characteristics of coordinated multipoint transmission are fully utilized, the information of single-cell large-scale fading factors of each user is utilized, the signal interference noise ratio of the downlink transmission of the service users can be accurately estimated, therefore, more suitable modulation coding mode is selected for the service users, and the aim of promoting data rate performance of the users is achieved.

Description

technical field [0001] The invention belongs to the field of wireless communication, is mainly oriented to a coordinated multi-point transmission system, and specifically relates to a method for estimating a signal-to-interference-noise ratio at a base station used in a coordinated multi-point transmission system. Background technique [0002] Coordinated Multi-Point (CoMP, Coordinated Multi-Point) transmission technology is a key technology for improving the spectral efficiency of cellular networks in wireless communication. When data and downlink channel information can be shared between coordinated base stations, the coordinated base stations can jointly perform downlink transmission to users to improve the data rate performance of downlink transmission. However, for a system using frequency division duplexing, the base station can only obtain downlink channel information through feedback from the user end. [0003] The limited feedback technology is a commonly used feed...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of how the base station in the coordinated multi-point transmission system selects the modulation and coding mode for the served users, the present invention proposes a method for estimating the signal-to-interference-noise ratio at the base station of the coordinated multi-point transmission system

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