关键词: MIMO系统, 列表检测, 排序QR分解, 最大似然

Abstract:

Based on sorted QR decomposition, a new list V-BLAST detection scheme is proposed. List detection is adopted for the first layer to produce several candidate symbols. A modified sorted QR decomposition is also proposed for the case of the number of candidates equal to the constellation size. Several groups of candidate symbols can be obtained when successive interference cancellation is applied to the following layers, and the minimum Euclidean distance (MED) search is used to choose one as the output. Analysis and simulation show that the proposed scheme can achieve very good performance with low complexity. When the number of antennas is less than 5, it can achieve near ML detection performance. A threshold can be set in the process of searching MED to further reduce the complexity, and the method for determining the threshold value is also given. Simulation results show that the method can reduce more than one half of the complexity while suffering a little performance loss.

Key words: MIMO system, list detection, sorted QR decomposition, maximum likelihood