Method for eliminating residual interference in multi-antenna broadcasting system and multi-antenna broadcasting system

Abstract

The invention relates to a multi-antenna broadcasting system residual interference eliminating method and a multi-antenna broadcasting system in order to solve a problem how residual multi-user interference of user terminals is reduced. A kth user terminal in N user terminals executes the steps of receiving decoding information of each user terminal of the first user terminal to the (k-1)th user terminal and first information from a base station; calculating residual interference of the corresponding user terminal for the kth user terminal; and eliminating the residual interference from the first information, and decoding the first information with the residual interference being eliminated so as to acquire decoding information of the kth user terminal. According to the invention, residual interference of the first user terminal to the (k-1)th user terminal for the kth user terminal is eliminated, so that system deterioration brought about by severe residual interference is alleviated because part of the residual interference is eliminated, and a problem that the accessibility rate of each user is restricted by the severe residual interference is enabled to be relieved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular, to a method for eliminating residual interference of a multi-antenna broadcast system and a multi-antenna broadcast system. Background technique [0002] Compared with the single-antenna technology, the multi-antenna technology provides an available spatial dimension in addition to the two available dimensions of time and frequency, which enables it to bring various gains under the same time-frequency resource block, including space diversity gain, Spatial multiplexing gain, array gain, interference cancellation, etc. Among them, diversity gain is a powerful means to combat wireless channel fading, multiplexing gain can bring linear growth to system capacity under the same time-frequency resource conditions, and array gain is conducive to improving signal-to-noise ratio, resisting fading and interference, etc. Thereby improving the coverage and performance of the wi...

AI Technical Summary

Problems solved by technology

[0004] However, since the rate of the feedback channel is usually severely limited, there is a deviation in the channel state information received by the base station, which in turn causes a deviation in the beamforming vector, so that it is impossible to perfectly orthogonalize the signals of multiple users, making the reception of the mobile terminal The signal faces serious residual multi-user interference, and the information received by each mobile terminal from the base station contains the residual interference of other mobile terminals to the mobile terminal

This severely degrades system performance

Especially in the case of a given number of feedback bits, the residual multi-user interference makes the achievable rate of each user limited, and cannot continue to grow with the signal-to-noise ratio

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