单载波超宽带系统的时域分数级分集方法

李博华; 裴玉奎

doi:10.16511/j.cnki.qhdxxb.2019.22.028

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清华大学学报（自然科学版） ›› 2019, Vol. 59 ›› Issue (9) : 729-736. DOI: 10.16511/j.cnki.qhdxxb.2019.22.028

电子工程

单载波超宽带系统的时域分数级分集方法

李博华^1,2, 裴玉奎^2,3,4

作者信息 +

Time domain fractional diversity method in single-carrier ultra-wideband systems

LI Bohua^1,2, PEI Yukui^2,3,4

Author information +

文章历史 +

摘要

单载波超宽带（SC-UWB）系统存在长时延密集多径，严重影响系统性能。传统信道均衡方法的均衡效果不够理想，而传统分集方法的硬件复杂度高且数据冗余量大。该文提出一种单载波频域均衡（SC-FDE）与时域分数级分集联合设计方法，以对抗超宽带（UWB）系统的复杂密集多径。该方法在发端为两个或多个信息支路配备一个分集支路；收端先进行SC-FDE，然后将信息支路和分集支路得到的均衡结果进行基于后验概率的分集合并或低复杂度的等增益分集合并，最终恢复出原始数据。该方法具有单天线、低冗余的特点，仅需1.5倍或更低倍数的分集，即可取得良好的分集增益。仿真结果表明：在误码率为10^-3下，该方法与SC-FDE相比有3 dB的分集增益。

Abstract

Long delays and dense paths seriously affect the performance of single-carrier ultra-wideband (SC-UWB) systems. Traditional channel equalization methods are not sufficient for these systems and the traditional diversity methods are very complex with excessive data redundancy. This paper presents a joint design method for single-carrier frequency domain equalization (SC-FDE) with time domain fractional diversity to improve the complex multipath characteristics of ultra-wideband (UWB) systems. At the transmitting end, this method uses one diversity branch for two or more information branches. At the receiving end, the system first performs the SC-FDE and then combines operations based on the posterior probabilities combination or the low complexity equal gain combination of the equalization results obtained by the information branches and the diversity branch. The system then finally recovers the original information. This time domain fractional diversity method has outstanding performance with a single antenna and low redundancy. The system needs only 1.5 or less applications of the diversity mode and obtains excellent diversity gains. Simulations show that this scheme has a 3 dB diversity gain over the SC-FDE scheme for a bit error rate of 10^-3.

导出引用

李博华, 裴玉奎. 单载波超宽带系统的时域分数级分集方法[J]. 清华大学学报（自然科学版）. 2019, 59(9): 729-736 https://doi.org/10.16511/j.cnki.qhdxxb.2019.22.028

LI Bohua, PEI Yukui. Time domain fractional diversity method in single-carrier ultra-wideband systems[J]. Journal of Tsinghua University(Science and Technology). 2019, 59(9): 729-736 https://doi.org/10.16511/j.cnki.qhdxxb.2019.22.028

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基金

国家自然科学基金资助项目（91538202，91338103）

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收稿日期	出版日期
2019-02-25	2019-09-15
发布日期
2019-08-27

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