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A symbol-level precoding method in a multi-user downlink CoMP

A multi-user, symbol-level technology, applied in diversity/multi-antenna systems, location diversity, radio transmission systems, etc., can solve the problem of not sharing transmitted data, etc., and achieve the effect of simple system model, easy implementation, and reduced interruption probability

Active Publication Date: 2018-12-25
XI AN JIAOTONG UNIV
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Problems solved by technology

Previous research on the CB mode considered that the base station can know the CSI between the local base station and all users, but does not share the transmitted data

Method used

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  • A symbol-level precoding method in a multi-user downlink CoMP
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  • A symbol-level precoding method in a multi-user downlink CoMP

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Embodiment Construction

[0050] The present invention provides a symbol-level precoding method for improving the quality of received signals at the receiving end in a multi-user downlink CoMP transmission system. The applied wireless transmission system includes two cells, and the base station in each cell is equipped with M antennas. The number of users served in the base station is K, and the served users are equipped with a single antenna, where M is greater than K; Indicates the channel coefficients from base station p and user i in its own cell, Indicates the channel coefficient of user i in base station n and cell p; Represents the additive white Gaussian noise signal at user i in base station p; the antennas of the two base stations transmit signal precoding vector x p , x n , where p=1,2; i=1,2; p≠n.

[0051] see figure 1 , the present invention a kind of symbol-level precoding method in multi-user downlink CoMP, comprises the following steps:

[0052] Step 1: The two base stations sha...

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Abstract

The invention discloses a symbol-level precoding method in a multi-user downlink CoMP, which adopts an MPSK modulation mode. According to the signal coefficients and target transmission information between the base station and the user, the antennas of the two base stations are designed to transmit precoding vector to control the interference between users and between users to serve multiple users. For the received useful signal, the equivalent signal-to-noise ratio (SNR) of the received signal is obtained by using the effective signal measurement scale and is used as the signal quality measurement index of the received signal. The precoding vectors of antennas for two base stations are obtained by solving the problem of maximizing the minimum equivalent signal-to-noise ratio (MESNR). Theuser exclusion strategy is used to find the optimal precoding vectors for antennas and compare them with the threshold of SNR to determine the precoding scheme. The symbol-level precoding scheme of the invention considers the concrete sending symbols, utilizes the constructiveness of the multi-user interference, converts the traditionally considered harmful interference into a beneficial factor, reduces the interruption probability of the receiving end, and improves the throughput of the system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a symbol-level precoding method in multi-user downlink CoMP. Background technique [0002] The explosive growth of traffic and the massive access of terminal equipment put forward higher requirements for the data transmission rate and network coverage of the communication system. Multi-user MIMO technology makes full use of space resources and improves the space multiplexing gain. By increasing the number of antennas, the system channel capacity can be doubled. By deploying a large number of small base stations of the same type, the frequency reuse gain can be improved, and the communication capacity of the entire system can also be improved. In the downlink multi-user MIMO system, for the interference between multiple users in a cell, precoding can be used at the base station to reduce the interference between multiple users. Dense small cell deploym...

Claims

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Application Information

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IPC IPC(8): H04B7/024H04B7/0456H04B7/06H04L27/20
CPCH04B7/024H04B7/0456H04B7/0626H04L27/20
Inventor 吕刚明杨建平李国兵张国梅
Owner XI AN JIAOTONG UNIV
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