IDMA通信系统中的粒子群交织算法

Particle swarm interleavers algorithm in IDMA communication system

在IDMA系统中,交织序列区分不同用户,其产生是随机且独立的。但一些交织序列互相关系数接近1,这严重影响通信性能。因此提出一种应用于IDMA通信系统中的粒子群交织算法。该方法以互相关矩阵作为适应度函数,采用粒子群算法寻找最优交织序列。仿真表明,该算法的性能优于非随机交织、随机交织和基于进化算法的交织。

Interleavers are employed as the means of users separation which are generated independently and randomly in IDMA system.But cross correlation coefficients of some interleavers sequences are near to 1 ,which seriously affect the performance of communication. In this paper, interleavers algorithm based on particle swarm is proposed ,and applies it in IDMA system.The covarianee matrix is used as a fitness function, and the optimum interleavers are computed by particle swarm algorithm.The simulation results show that the proposed algorithm has better performance than un-random inter- leavers,independent and random interleavers and evolutionary interleavers.