Multipoint part coordinating robust precoding method for resisting antenna calibration errors of transceiver

Abstract

The invention relates to a multipoint part coordinating robust precoding method for resisting antenna calibration errors of a transceiver, which belongs to the technical field of wireless communication. The method includes the steps of (1) calculating a covariance matrix Ru of a downlink global equivalent channel hu,D according to an uplink global equivalent channel hu,u estimated by a coordinating base station and statistical characteristics E{gugu<H>} of the antenna calibration errors; (2) constructing a block diagonal matrix Du, and sharing data information which is used for characterizing the uth served user among part of the coordinating base station only; (3) calculating the maximum characteristic value lambada u and a corresponding feature vector fu of the matrix; (4) constructing a Nu*Nu dimensional matrix sigma; and (5) calculating the transmitting power [q1,?-q<Nu>] of a quasi-precoding vector of the Nuth served user and the like. The robust precoding method is used for resisting the antenna calibration errors of a real system and can recover system performance losses caused by the antenna calibration errors to a great extent, and robust precoding proposed by the method can effectively reduce the system cost through reducing the requirements for a reference antenna precision.

Description

technical field [0001] The present invention relates to a multi-point partial cooperative robust precoding method against transceiver antenna calibration errors, in particular to time division duplex (TDD) oriented multi-point coordinated transmission (CoMP) system for downlink space division multiplexing The invention relates to a multi-user robust transmission precoding method based on partial data information sharing, which belongs to the technical field of wireless communication. Background technique [0002] Mutual interference between cells is one of the main bottlenecks for mobile communication systems to improve link transmission reliability and network spectrum efficiency. Therefore, how to effectively suppress inter-cell interference is a key problem to be solved in future mobile communication systems. Coordinated multi-point transmission (hereinafter referred to as CoMP) technology can change the interference signal between cells into the desired signal of the ser...

AI Technical Summary

Problems solved by technology

At this time, the system cannot find users who are close to all cooperative base stations at the same time to participate in the air interface calibration, which leads to poor accuracy of some uplink and downlink equivalent channels estimated by the base station and users, resulting in large antenna calibration errors

[0010] In a CoMP system, antenna calibration errors between multiple cooperative base stations will cause the signals sent by them to not be effectively combined at the user end, or even interfere with each other

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