[1]赵军辉,叶蓁蓁,赵春明,等.使用软判决反馈的迭代信道估计方法在CDMA系统中研究[J].东南大学学报(自然科学版),2003,33(1):1-4.[doi:10.3969/j.issn.1001-0505.2003.01.001]
 Zhao Junhui,Ye Zhenzhen,Zhao Chunming,et al.Iterative channel estimation using soft decision feedback in CDMA system[J].Journal of Southeast University (Natural Science Edition),2003,33(1):1-4.[doi:10.3969/j.issn.1001-0505.2003.01.001]
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使用软判决反馈的迭代信道估计方法在CDMA系统中研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
33
期数:
2003年第1期
页码:
1-4
栏目:
信息与通信工程
出版日期:
2003-01-20

文章信息/Info

Title:
Iterative channel estimation using soft decision feedback in CDMA system
作者:
赵军辉 叶蓁蓁 赵春明 尤肖虎
东南大学移动通信国家重点实验室, 南京 210096
Author(s):
Zhao Junhui Ye Zhenzhen Zhao Chunming You Xiaohu
National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
关键词:
CDMA 信道估计 软判决反馈
Keywords:
CDMA channel estimation soft decision feedback
分类号:
TN929.533
DOI:
10.3969/j.issn.1001-0505.2003.01.001
摘要:
首先介绍了基于CDMA2000系统中Rake接收机的信道估计方法,然后将Turbo原理引入信道估计,针对CDMA系统提出了2种迭代信道估计方法.通过使用Rake接收机或解码之后的软信息来改善整个CDMA系统的性能,对CDMA系统中联合运用信道估计与解码技术进行了研究.由于联合信道估计与解码技术可以利用通信系统不同模块之间的“软信息”交换,从而有效提高信道估计准确程度和解码器的性能.仿真结果表明,利用解码之后的软信息来修正信道估计的方法较传统的Rake接收机中的信道估计方法性能有较大改善,在误码率为10-3左右时,可以提高大约2 dB.
Abstract:
The channel estimation in Rake receiver is introduced based on CDMA2000 system and then the Turbo principle i s applied to channel estimation. Two iterative channel estimation schemes with soft decision feedback for CDMA system are presented. Joint channel estimation and soft output from Rake receiver and decoder method are also discussed in this paper. Joint channel estimation and decoder technique effectively improve the performance of channel estimation and decoder by taking advantage of information exchange between different units in a communication system. These two schemes can remarkably improve the performance of CDMA system by using soft information after Rake receiver or decoder. The simulation result shows that the improvement of the bit-error rate over non-iterative scheme is about 2 dB when bit error ration equals 10-3(decoder feedback).

参考文献/References:

[1] Valenti M C,Woerner B D.Iterative channel estimation and decoding of pilot symbol assisted Turbo codes over flat-fading channels[J].IEEE Trans Commun,1998,19(9):1697-1705.
[2] Li Qinghua,Georghiades C N,Wang Xiaodong.An iterative receiver for turbo-coded pilot-assisted modulation in fading channels [J].IEEE Commun Letter,2001,5(4):145-147.
[3] TIA/EIA/IS-2000-2.Physical Layer Standard for CDMA2000 Spread Spectrum System[S].http://www.3gpp2.org/Public_html/specs/C.S0002-A-1.pdf.2000-09-12/2001-08-30.
[4] Xu Changlong,You Xiaohu.Model of the Rake receiver for CDMA2000 reverse link [J].Journal of Southeast University(National Science Edition),1999,15(2):14-19.
[5] Herzog R.Interference cancellation for a high data rate user in coded CDMA systems [A].In:IEEE ICC[C].Atlanta,Georgia,USA,1998,2:709-713.
[6] Hagenauer J,Hoeher P.A viterbi algorithm with soft-decision outputs and its applications [A].In:IEEE GLOBECOM[C].Sydney,Australia,1989,3:1680-1686.

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备注/Memo

备注/Memo:
基金项目: 国家863计划资助项目(863-317-03-01-02-04-20/MII-
C3G-02-04-002)、东南大学通信技术公司资助项目.
作者简介: 赵军辉(1973—),男,博士生,zhaojh@seu.edu.cn; 尤肖虎(1962—),男,教授,博士生导师,xhyu@seu.edu.cn.
更新日期/Last Update: 2003-01-20