Unmatched channel power distribution method based on zero-forcing precoding and system thereof

Abstract

An embodiment of the invention provides a unmatched channel power distribution method based on zero-forcing precoding and a system thereof. The method comprises the following steps of acquiring and according to a terminal of an multiple-input-multiple-output system of zero-forcing precoding and an amplitude and a phase of a radio frequency circuit gain of a base station, establishing an uplink channel model and a downlink channel model; according to the uplink channel model and the downlink channel model, determining an approximate sum rate; and according to the approximate sum rate, establishing an optimization function taking a maximized approximate sum rate as an object. When receiving and transmission circuits of a base station side match with each other, and receiving and transmission circuits of a terminal side do not match with each other, according to the optimization function, through a water filling theorem, an optimal solution of base station power distribution is determined. Or when the receiving and transmission circuits of the terminal side match with each other, and the receiving and transmission circuits of the base station side do not match with each other, according to the optimization function, through a formula which is used to convert the function from nonconvexity into convexity, the optimal solution which makes the approximate sum rate be a maximum is determined. According to the optimal solution, downlink power of the multiple-input-multiple-output system is configured.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a non-matching channel power allocation method and system based on zero-forcing precoding. Background technique [0002] Compared with the single-antenna system, the MIMO (Multiple-Input Multiple-Output) system has superior performance such as diversity and multiplexing gain, higher rate and reliability, and is considered as a kind of cellular communication system. important technology. In recent years, the massive MIMO system, that is, the base station installs a large number of antennas, and the number of antennas is increased to several hundred to serve dozens of users at the same time, so as to obtain higher speed and reliability. Massive MIMO system is considered to be an important key technology of 5G communication system. [0003] The base station uses downlink CSI (Channel State Information, channel state information) to perform precoding to bette...

AI Technical Summary

Problems solved by technology

Therefore, the random change of the RF circuit of the transceiver will cause the uplink and downlink channels to be difficult to maintain the reciprocity of the channel even if they are in the same frequency band.

Therefore, in the prior art, directly configuring the downlink power according to the uplink signal will cause unreasonable allocation of communication system resources and waste system communication resources.

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