A Base Station Signal-to-Interference-to-Noise Ratio Estimation Method for Coordinated Multipoint Transmission System

Abstract

The present invention provides a method for estimating the signal-to-interference-noise ratio at the base station for a coordinated multi-point transmission system. First, the base station receives user feedback information: codeword, joint channel quantization accuracy, joint channel modulus and noise, and cooperative cluster The energy sum of external interference; then reconstruct the joint channel of each user, select the serving user, allocate the receiving power among the serving users and calculate the precoding vector; Interference energy, estimate the SINR of the downlink transmission of the user; finally, the base station selects a modulation and coding method for the serving user according to the estimated SINR and performs downlink transmission. The present invention makes full use of the channel characteristics of coordinated multi-point transmission, utilizes the information of the user's single-cell large-scale fading factor, and can more accurately estimate the signal-to-interference-noise ratio of the serving user's downlink transmission, thereby selecting a more suitable modulation and coding method for the serving user , to achieve the purpose of improving user data rate performance.

Description

technical field [0001] The invention belongs to the field of wireless communication, is mainly oriented to a coordinated multipoint transmission system, and in particular relates to a base station side signal-to-interference and noise ratio estimation method for a coordinated multipoint transmission system. Background technique [0002] Coordinated Multi-Point (CoMP) transmission technology is a key technology for improving the spectral efficiency of cellular networks in wireless communications. When the cooperative base stations can share data and downlink channel information, the cooperative 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 terminal. [0003] The limited feedback technology is a commonly used feedback technology in the current sys...

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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