基于循环平稳周期的交织差分最小均方误差多用户检测算法

doi:10.3969/j.issn.0255-8297.2012.05.005

应用科学学报 ›› 2012, Vol. 30 ›› Issue (5): 466-472.doi: 10.3969/j.issn.0255-8297.2012.05.005

基于循环平稳周期的交织差分最小均方误差多用户检测算法

冯兴乐，李蔚，姜云国

长安大学信息工程学院，西安710064

收稿日期:2011-04-24 修回日期:2011-09-11 出版日期:2012-09-24 发布日期:2012-09-22
通信作者: 冯兴乐，副教授，研究方向：MIMO多用户检测与智能交通，E-mail: xlfeng@chd.edu.cn
作者简介:冯兴乐，副教授，研究方向：MIMO多用户检测与智能交通，E-mail: xlfeng@chd.edu.cn
基金资助:
国家自然科学基金(No.61271262)；教育部长江学者和创新团队发展计划基金(No.IRT0951)；陕西省科学技术研究发展计划项目基金(No.2011K06-28)；高等学校博士学科点专项科研基金(No.20090205120002)；中央高校基本科研业务费专项资金(No.CHD2012JC069, No.CHD2012TD011)资助

Interleaving Differential MMSE Multiuser Detection Based on Cyclic-stationary Period

FENG Xing-le, LI Wei, JIANG Yun-guo

School of Information Engineering, Chang’an University, Xi’an 710064, China

Received:2011-04-24 Revised:2011-09-11 Online:2012-09-24 Published:2012-09-22

摘要/Abstract

摘要：

以抑制宽带码分多址(wide code division multiple access, WCDMA)系统在快变信道中的多址干扰为目标，提出基于循环平稳周期的交织差分最小均方误差(interleaving differential minimum mean square error, IDMMSE) 多用户检测算法. 根据WCDMA系统特有的二级扩频结构，将差分最小均方误差(differential minimum mean square error, IDMMSE) 算法的权系数优化准则改为基于循环平稳周期，而不是基于简单的扩频因子. 该方法更准确地反映了多址干扰的变化规律，有利于抑制多址干扰. 另外，引入交织技术能使信源不相邻的具有相同综合扩频序列的符号在实际信道中相邻传输，从而保证DMMSE算法所需的快变信道中相邻两个符号周期内信道变化很小的假设成立. 仿真实验表明，IDMMSE算法能在一定程度上对抗多普勒频移，且误码性能优于现有自
适应MMSE算法.

关键词: 宽带码分多址, 多用户检测, 差分最小均方误差, 循环平稳周期, 交织

Abstract:

To suppress multiple access interference (MAI) in wide code division multiple access (WCDMA) systems in a fast fading channel, an interleaving differential MMSE multiuser detection method based on the cyclo-stationary period is proposed. According to typical characteristics of two-layered spreading modulation in WCDMA, the update criterion of coefficients is based on the cyclo-stationary period, instead of the spread factor. As the proposed method can characterize the pattern of MAI properly, improved performance can be achieved. Moreover, interleaving is involved to let the symbols with the same comprehensive spread sequence be transmitted consecutively to ensure that the channel gains of successive symbols keep constant in the fast fading channel. Simulation results show the performance is improved without increasing the system complexity, and Doppler shift is better dealt with.

Key words: wide code division multiple access (WCDMA), multiuser detection, differential minimum meansquare error (IDMMSE), cyclo-stationary period, interleave

中图分类号:

TN914.4

冯兴乐，李蔚，姜云国. 基于循环平稳周期的交织差分最小均方误差多用户检测算法[J]. 应用科学学报, 2012, 30(5): 466-472.

FENG Xing-le, LI Wei, JIANG Yun-guo. Interleaving Differential MMSE Multiuser Detection Based on Cyclic-stationary Period[J]. Journal of Applied Sciences, 2012, 30(5): 466-472.

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基于循环平稳周期的交织差分最小均方误差多用户检测算法

Interleaving Differential MMSE Multiuser Detection Based on Cyclic-stationary Period

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