摘要
MC-CDMA是目前最新的移动通信系统,它极大地提高了通信速率和抗频率选择性衰落的性能,但由于受到多址干扰的影响,必须采用多用户检测技术.该文提出了一种基于免疫算法的多用户检测方法,有效消除了多址干扰和远近效应的影响,并能够快速收敛到全局最优解.实验仿真结果表明,基于免疫算法的多用户检测方法无论在信噪比、远近比还是用户数目变化时,其性能均优于同等条件下的解相关和最小均方方法,更接近于最佳多用户检测性能,而且运行时间明显小于最佳多用户检测.
MC-CDMA is a newest mobile telecommunication system combining with OFDM and CDMA. It greatly improves the transmission rate and avoids the frequency selective fading. Because of the influence of MAI, it is necessary to use the multi-user detection technology. Thereby, the paper proposes a new multi-user detection method based on immune algorithm, which effectively eliminates the multi access interference and near-far effect, and quickly converges to global optimal solution. According to experimental and simulation results, it is proved that, when the signal/noise ratio, near/far ratio and the number of users vary, the new detecting method is superior to decorrelation method and minimal mean square method, nearly reaching the optimal detecting performance with computing time much less than multi-user detection method.
出处
《应用科技》
CAS
2008年第5期4-8,共5页
Applied Science and Technology
