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

doi:10.11959/j.issn.1000-436x.2015195

摘要/Abstract

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 $\frac{1}{64}$ 。计算机仿真结果验证了所得结论。

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

Abstract:

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 $\frac{1}{64}$ computational burden.The computer simulation results validate the conclusions obtained.

Key words: SC-FDMA, sample clock offset, multi-user detection, harmony search

丁丹,程乃平,廖育荣. 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[J]. 通信学报, 2015, 36(10): 181-187.

Dan DING,Nai-ping CHENG,Yu-rong LIAO. Impact and compensation of sample clock offset in I-CFDMA uplink[J]. Journal on Communications, 2015, 36(10): 181-187.

图/表 4

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