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

Dan DING; Nai-ping CHENG; Yu-rong LIAO

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

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

academic paper | 更新时间：2024-06-05

- Impact and compensation of sample clock offset in I-CFDMA uplink
- Journal on Communications Vol. 36, Issue 10, Pages: 181-187(2015)
- 作者机构：
  
  装备学院光电装备系，北京 101416
- 作者简介：
- 基金信息：
  
  The National High Technology Research and Development Program of China(863 Program)(2014AA7011071)
- DOI：10.11959/j.issn.1000-436x.2015195
  CLC： TN914.4
- Online First：2015-10，
  
  Published：25 October 2015
- 稿件说明：
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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.
DOI：

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

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

。计算机仿真结果验证了所得结论。

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

computational burden.The computer simulation results validate the conclusions obtained.

关键词

Keywords

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