交织码分与频分复用上行链路中采样时钟偏差影响及补偿  

Impact and compensation of sample clock offset in I-CFDMA uplink

作　　者：丁丹 程乃平 廖育荣 

机构地区：[1]装备学院光电装备系,北京101416

出　　处：《通信学报》2015年第10期181-187,共7页Journal on Communications

基　　金：国家高技术研究发展计划("863"计划)基金资助项目(2014AA7011071)~~

摘　　要：为解决交织码分与频分复用(I-CFDMA,interleaved code and frequency division multiple access)上行链路中采样时钟的同步问题,构建了I-CFDMA上行链路系统模型,探讨了采样时钟偏差(SCO,sample clock offset)给系统模型带来的扰动,并定量分析了由SCO引起的信号时移、信号相移、多用户干扰(MUI,multi-user interference)和子载波间干扰(ICI,inter-carrier interference);在此基础上提出了I-CFDMA上行链路中多用户SCO的补偿方法,一方面根据各用户的SCO对相关度量函数进行必要修正,另一方面提出一种基于和声搜索的多用户检测(MUD,multi-user detection)算法,其效率高于常用的遗传算法,性能接近无SCO时的最优检测,而运算量仅为最优检测的1/64。计算机仿真结果验证了所得结论。To achieve the sample clock synchronization in the interleaved code and frequency division multiple access（I-CFDMA） uplink, the I-CFDMA uplink model was established, and the disturbance of the sample clock offset（SCO） on the system model was discussed, in addition, the signal time shift, phase rotation, multi-user interference（MUI） and inter-carrier interference（ICI） caused by SCO were analyzed quantitatively. On this basis, a compensation method of multi-user SCO was proposed. For one thing, the relevant metric function was modified considering the SCO of each user; for another thing, a multi-user detection（MUD） algorithm based on harmony search was proposed. This algorithm has a higher efficiency than the commonly-used genetic algorithm（GA）, as well as a performance approximate to that of optimal detection without SCO but with 1/64 computational burden. The computer simulation results validate the conclusions obtained.

关 键 词：单载波频分多址 采样时钟偏差 多用户检测 和声搜索 

分 类 号：TN914.4[电子电信—通信与信息系统]