Cell detecting method and device for interference cancellation

Abstract

The embodiment of the invention discloses a cell detecting method and a cell detecting device for interference cancellation. The method comprises the following steps of: performing full system multipath scanning based on secondary synchronization signal center conjugate symmetry; picking a strongest path with highest power, and identifying the time delay position of the strongest path; comparing the power of the strongest path with a first power threshold, and if the power of the strongest path is greater than the first power threshold, cancelling interference caused by signals of the path from the received mixed signals; identifying a cell of the strongest path, and accumulating the channel measurement of the cell; repeating the interference cancellation process till the detected power of the strongest path is smaller than or equal to the first power threshold; and performing valid cell screening based on a second power threshold to acquire a valid cell set and an intensity measurement sequence thereof. According to the embodiment, a valid interference cancellation effect can be achieved, and complexity can be reduced.

Description

technical field [0001] The present invention relates to the field of interference elimination, in particular to a method and device for detecting interference elimination cells in a HetNet (Heterogeneous Network, heterogeneous network) in LTE-Advanced (Long Term Evolution Advanced, wireless communication long-term evolution system). Background technique [0002] In the wireless cellular system, the network consists of countless cellular cells for wide-area seamless coverage in a certain area. Spectrum resources are extremely precious for wireless networks. In order to obtain high spectrum utilization efficiency, spectrum multiplexing networking is usually adopted with a reuse factor of 1, that is, each cell can reuse all available spectrum resources of the system. This leads to co-channel co-channel interference among multiple cells, and co-channel interference between multiple cells in a cellular system becomes a key factor restricting further improvement of network capacit...

AI Technical Summary

Problems solved by technology

The number of cells in the Long Term Evolution LTE system is 504. If the search is performed based on the total set of 504 cells, the complexity will be huge

In addition, it is not optimal to perform serial interference cancellation between cells according to the strength of the cell from strong to weak, and within the cell according to the strength of multipath from strong to weak.

Therefore, to sum up, there are two main disadvantages of the existing schemes, one is high complexity; the other is non-system global multipath intensity sorting interference elimination, and the interference elimination is not thorough enough

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