Base station antenna selecting method based on interference alignment in multi-cell system

Abstract

The invention discloses a base station antenna selecting method based on interference alignment in a multi-cell system, and mainly solves the problems that an existing multi-antenna interference alignment technology is relatively high in system hardware cost, and the base station antenna selecting method based on interference alignment can only be used in a network comprising 3 cells. The method comprises the following implementation steps of: estimating state information of channels from various base stations to users in the resident cells; initiating base station antenna selection schemes of the various cells; along a system and capacity increase optimizing direction, under the condition that other base station antenna selection schemes are unchanged, determining the optimal base station selection schemes of the various cells in sequence by using partial iterative interference alignment; and performing multi-cell interference coordination by adopting traditional iterative interference alignment. The base station antenna selecting method is applicable to an LTE (Long Term Evolution) network oriented to commercial use with a plurality of cells, is low in computation complexity, can reduce the system hardware cost, and realizes compromise between system and capacity and computation complexity.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and further relates to a base station antenna selection method based on interference alignment in a multi-cell system, which can be used for commercial-oriented LTE networks. Background technique [0002] In order to improve the capacity of the cellular system, the next-generation wireless communication system represented by the LTE network requires full frequency reuse of adjacent cells as much as possible, that is, the spectrum reuse factor is 1. Therefore, compared with noise and fading, inter-cell interference becomes the main factor affecting system performance. How to effectively carry out interference coordination among multiple cells, especially to eliminate the interference of cell edge users has attracted extensive attention. Interference alignment is an interference coordination technology proposed in recent years. It can align the interference signals from other base s...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that although the number of antennas of the user is generally small in MIMO systems, the base station may be equipped with a large number of antennas. This method does not consider that as the number of base station antennas increases, the The RF links of components such as converters, down-converters, and low-noise amplifiers will also gradually increase, thereby increasing the problem of system hardware costs

The disadvantage of this method is that since the non-iterative interference alignment can only complete the interference coordination of 3 cells, this method is only applicable to a system containing 3 cells, so it has limitations and cannot be extended to a multi-cell system

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