两径衰落短波信道下的改进型双向判决反馈均衡器

doi:10.3969/j.issn.0255-8297.2012.05.002

应用科学学报 ›› 2012, Vol. 30 ›› Issue (5): 448-454.doi: 10.3969/j.issn.0255-8297.2012.05.002

两径衰落短波信道下的改进型双向判决反馈均衡器

邵汉钦，徐大专，王磊

南京航空航天大学电子信息工程学院，南京210016

收稿日期:2011-03-06 修回日期:2011-11-08 出版日期:2012-09-24 发布日期:2012-09-25
作者简介:作者简介：邵汉钦，博士生，研究方向：无线通信，E-mail: shaohanqin@nuaa.edu.cn；徐大专，教授，博导，研究方向：通信信号处理、无线通信，E-mail：xudazhuan@nuaa.edu.cn
基金资助:
国家自然科学基金(No.60801052)；中央高校基本科研业务费专项资金(No.2009ZC52036, No.NZ2012010, No.NZ2012012)
资助

Modified Bidirectional Decision-Feedback Equalizer for Two-Ray Fading HF Channels

SHAO Han-qin, XU Da-zhuan, WANG Lei

College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China

Received:2011-03-06 Revised:2011-11-08 Online:2012-09-24 Published:2012-09-25

摘要/Abstract

摘要：

将双向判决反馈均衡器(bidirectional decision-feedback equalizer, BiDFE) 应用于两径衰落短波信道，提出了一种低复杂度的改进型BiDFE 方案. 针对两径信道的特殊性质，对均衡器的系数进行优化设置，在此基础上对BiDFE 的正向DFE和反向DFE进行最大比合并. 理论分析和仿真结果表明，改进型BiDFE 能够使正向DFE和反向DFE的输出完全消除码间干扰，且输出信噪比为两条支路的信噪比之和. 在两径衰落短波信道下，改进型BiDFE 的误码率性能优于传统DFE和双向任选DFE(bidirectional arbitrated DFE, BAD)，且计算复杂度低于BAD.

关键词: 双向判决反馈均衡器, 两径衰落信道, 短波信道, 码间干扰, 最大比合并

Abstract:

In this paper, we consider the use of a bidirectional decision-feedback equalizer (BiDFE) in two-ray fading HF channels. A low-complexity modified BiDFE using the properties of these channels is proposed. Coefficients of the equalizer are optimized, and the outputs of forward DFE and time-reversal DFE are combined using maximal ratio combining (MRC) rules. Theoretical analysis and computer simulations show that the proposed scheme completely cancels inter-symbol interference (ISI) between the two streams so that signal-tonoise ratio (SNR) is the sum of SNRs of the two streams. The performance of modified BiDFE is superior to conventional DFE and bidirectional arbitrated DFE (BAD), while the computation complexity is lower than BAD.

Key words: bidirectional decision-feedback equalizer (BiDFE), two-ray fading channels, high frequency (HF)channel, inter-symbol interference (ISI), maximal ratio combining (MRC)

中图分类号:

TN911.5

邵汉钦，徐大专，王磊. 两径衰落短波信道下的改进型双向判决反馈均衡器[J]. 应用科学学报, 2012, 30(5): 448-454.

SHAO Han-qin, XU Da-zhuan, WANG Lei. Modified Bidirectional Decision-Feedback Equalizer for Two-Ray Fading HF Channels[J]. Journal of Applied Sciences, 2012, 30(5): 448-454.

参考文献

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两径衰落短波信道下的改进型双向判决反馈均衡器

Modified Bidirectional Decision-Feedback Equalizer for Two-Ray Fading HF Channels

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