| 引用本文： |
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高 丽,张天骐,侯瑞玲,等.基于改进EASI算法的DS-CDMA信息码与伪码盲估计[J].电讯技术，2012，52（8）： - . [点击复制]
- GAO Li,ZHANG Tian-qi,HOU Rui-ling,et al.Information and chip sequence blind estimation for DS-CDMA system based on improved EASI algorithm[J].，2012，52（8）： - . [点击复制]
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| 摘要: |
| 针对直扩序列码分多址(DS-CDMA)系统多用户检测的问题，提出
了一种基于性能指标（PI）变步长EASI算法信息码与伪码盲估计的算法。该算法在比较盲源
分离（BSS）和DS-CDMA系统模型的基础上，用自适应的方法估
计混合矩阵进而估计出伪码，并利用分离矩阵分离观测信号从而估计出信息码。另外，该算
法利用PI值来调整步长，使算法收敛速度和稳定性能达到一个理想平衡点。实验结果显示，
该算法具有很好的抗多址干扰(MAI)的能力,伪码和信息码的误码率分别在-10 dB和0
dB时达到10－2以下；对不同用户数，5 dB时所有扩频码被完全正确检测
的概率几乎都在80%以上。 |
| 关键词: 直扩序列码分多址 EASI算法 PI变步长 伪码估计；盲源分离 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（61071196，61102131）；教育部新世纪优秀人才支持计划项目（NCET-10-0927）；信号与信息处理重庆市市级重点实
验室建设项目（CSTC2009CA2003）；重庆市杰出青年基金项目（CSTC2011jjjq40002）；重庆市自然科学基金资助项目（CSTC2009BB2287，CSTC2010BB2398，CSTC2010BB2409，CSTC2010BB2411） |
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| Information and chip sequence blind estimation for DS-CDMA system based on improved EASI algorithm |
| GAO Li,ZHANG Tian-qi,HOU Rui-ling,HE Dan-na |
| (Chongqing Key Laboratory of Signal and Information Processing,Chongqing Univers
ity of Posts and Telecommunications,Chongqing 400065,China) |
| Abstract: |
| To solve the problem of the direct sequence code division multiple access (DS-CD
MA) system multi-user detection, this paper proposes a variable step-size EASI（
Equivariant Adaptive Separation via Independence） algorithm based on PI(Perform
ance Index) for information code and chip sequence blind estimation.Through comp
aring blind source separation(BSS) and DS-CDMA system model, the algorithm uses
adaptive method to estimate the mixing matrix and then estimate the chip sequenc
e. The demixing matrix is used to separate the observation signal, and then esti
mate the information code. In addition, the algorithm uses evaluation PI to adju
st the step-size, which makes convergence speed and stable performance of the al
gorithm reach an ideal balance. The experimental results show that the algorithm
has good resistance ability on multi-access interference(MAI). The bit error ra
te of the chip sequence and information code is below 10－2 in -10 dB
and 0 dB respectively. To different user number, the probability of all PN c
odes estimated completely correctly is almost 80% above in 5 dB. |
| Key words: DS-CDMA EASI algorithm PI variable step-size chip
sequence estimation blind source separation |
《电讯技术》编辑部 