快跳频系统中基于连续干扰相消的多用户检测

Multiuser Detection Algorithm Based on Successive Interference Cancellation for FFH Systems

针对快跳频多址系统,提出了一种基于连续干扰相消的非相干多用户检测算法.该算法利用期望元素选择方式来得到伴随时频矩阵,利用期望用户的时频矩阵具有最大行和最小均方偏差的特点实现预检测.在连续干扰相消中,对干扰数据的信干功率比进行估计,若干扰频点没有受到其他信号的重叠干扰,则在相消中删除,否则连续迭代,直到所有用户译码完成.对于其他模糊用户,采用简化的连续检测方法来判决.仿真结果表明:该算法不仅消除了Fiebig干扰相消算法的错误传播,而且所提算法性能优于其他多用户算法.

A noncoherent multiuser detection algorithm based on successive interference cancellation （SIC） for fast frequency hopping （FFH） multiple-access systems was proposed. The accompanying time- frequency （TF） matrix was calculated based on expectation element selection （EES）. The majority row and minimum mean square error of the TF matrix of the desired user were used for pre-deteetion. If the symbol of interference data was not interfered by other users by estimating the signal interference noise ratio （SINR） of interference data in SIC, the corresponding element in the TF matrix would be zero. Otherwise, the SIC repeated until all the users were recoded accurately. The simplified successive detection was used to resolve the ambiguity users. The simulation shows that this algorithm can cancel the outspread error of Fiebig＇s detection and have better performance than other muhiuser algorithms.