一种采用权重因子的低复杂度空间调制检测算法

A Low Complexity Detection Algorithm Based on the Weight Factors for Spatial Modulation System

针对空间调制系统的最大似然算法复杂度较高的问题,提出一种改进的最大比合并算法.定义一种权重因子,其下标对应发射天线序号;通过对权重因子的值进行降序排列,选取前L个值所对应的天线组成天线候选集,假设天线候选集中的某一根天线被激活,利用迫零算法计算该天线下的发送符号;最后对天线候选集中所有天线和对应的估计符号进行最大似然搜索.仿真结果表明,所提出的新算法在保证次优检测性能的前提下,明显降低了算法的复杂度.

Aiming at the high complexity of the maximum likelihood detection algorithm for spatial modulation systems,an improved maximum ratio combing algorithm was proposed.In this algorithm,a weighting factor was defined,whose subscript corresponded to the sequence number of transmitting antenna.Then the values of the weighting factor were sorted in descending order,and the antennas corresponding to the first L values were selected to form the antenna candidate set.Assuming that an antenna in the antenna candidate set was activated,the possible transmit signal was calculated by zero forcing algorithm.Maximum likelihood search was performed for all antennas and corresponding estimation symbols in the antenna candidate set.Simulation results show that the proposed algorithm can significantly reduce the complexity of the algorithm on the premise of ensuring the sub-optimal detection performance.