Distributed interference elimination method based on signal leakage noise ratio

Abstract

The invention provides a distributed interference elimination method based on a signal leakage noise ratio, which includes the steps that each base station uses effective channel information in a cell and interference leakage channel information between cells in a cooperation set to construct an optimized target function for each user in the cell, the optimized target function is calculated to obtain user power controlling elements, the optimized target function and the user power controlling elements are calculated to obtain an equivalent matrix relative to a pre-coding matrix, the equivalent matrix is calculated in an eigenvalue decomposition method to obtain a main eigenvector of the equivalent matrix, the main eigenvector of the equivalent matrix is calculated to obtain an optimum pre-coding vector, the base stations use the optimum pre-coding vector to conduct pre-processing on original signals to be transmitted by users and transmit the original signals after pre-processed to each user in the cell according to the power controlling elements. The distributed interference elimination method increases use rate of system power resources and throughput of a system and remarkably improves performance of the system.

Description

technical field [0001] The present invention relates to the field of inter-cell interference coordination, and more specifically, the present invention relates to a distributed interference elimination method based on SNR. Background technique [0002] In the next-generation cellular network, base stations will be deployed in a denser form, and resource allocation methods with higher spectrum reuse ratios need to be designed. Therefore, interference problems will become a key factor limiting system performance. Through investigation, it is found that the existing interference elimination technologies include: inter-cell interference coordination technology, precoding matrix design scheme and so on. Among them, the basic principle of inter-cell interference coordination technology is to set certain restrictions on system resource management to avoid serious inter-cell interference. Taking the orthogonal transmission mode as an example, in this mode, the base station selects a...

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Problems solved by technology

[0003] However, the existing distributed interference cancellation methods have the following problems: 1. The inter-cell interference coordination algorithm represented by the orthogonal transmission mode is a static algorithm. When the load of the system changes, the algorithm cannot adapt to this change, thus affecting 2. The number of orthogonal users supported by the orthogonal transmission mode is limited, that is, the number of users that the base station can serve is limited by the number of transmitting antennas of the base station. Then, when the number of users in the cell is large, the The algorithm cannot provide better cell throughput; 3. In the precoding matrix design method represented by the multi-cell leakage compression algorithm, the user's power allocation problem is not considered, so the power cannot be properly allocated according to the user's channel state resources, thereby limiting the improvement of system resource utilization

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