Interference Alignment Method and Apparatus

Abstract

The present invention provides an interference aligning method and device. The method includes: if the user number of a current cell is larger than the maximum user number k^ which meets the condition of full inter-cell interference alignment, selecting k^ users of the current cell and determining receiving pre-encoding matrixes respectively corresponding to the k^ users of the current cell; determining a first sending pre-encoding matrix according to the receiving pre-encoding matrixes and a channel matrix of each user of the current cell with respect to a base station of an adjacent cell of the current cell; determining a second sending pre-encoding matrix according to a maximum signal leaking noise ratio principle; and performing interference aligning based on the receiving pre-encoding matrixes, the first sending pre-encoding matrix and the second sending pre-encoding matrix. The method and the device reduce the interference leakage of the system, lower the influence on throughput capacity of the system caused by the inter-cell interference, and increase the spectrum effectiveness when the number of the cell users is larger than maximum user number k^ which achieves inter-cell interference alignment.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to an interference alignment method and device. Background technique [0002] With the rapid development of wireless communication, more and more people can access the communication network conveniently and efficiently, but at the same time, it also brings the reality and problem of lack of wireless spectrum resources. Due to the increasing shortage of spectrum resources, and in order to meet the requirements for higher data rates, in the next generation of wireless cellular systems, multi-antenna technology that can obtain higher spectrum efficiency is introduced, and it is generally expected to use a multiplexing factor of 1. Make a network. In this scenario, the multi-cell multi-antenna system will inevitably generate co-channel interference, and this interference will even seriously weaken the high spectral efficiency brought by the multi-antenna technolo...

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Problems solved by technology

[0004] However, the disadvantage of the centralized interference alignment method is that, on the one hand, the condition that each node needs to know the CSI information will become difficult to realize as the number of nodes increases, which not only greatly increases the overhead of the feedback link, but also On the other hand, when the number of users in a cell is greater than the maximum number of users that can achieve full interference alignment between cells, the beam may not have a solution, which will cause interference leakage, which will seriously affect the throughput of the system and make the interference Alignment loses its meaning

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