高速移动环境下低复杂度OTSM迭代rake均衡方法

doi:10.11959/j.issn.1000-436x.2022203

通信学报 ›› 2022, Vol. 43 ›› Issue (10): 86-93.doi: 10.11959/j.issn.1000-436x.2022203

高速移动环境下低复杂度OTSM迭代rake均衡方法

李国军¹^,², 龙锟¹^,³, 叶昌荣¹^,²^,⁴, 梁佳文¹^,²

¹ 重庆邮电大学超视距可信信息传输研究所，重庆 400065
² 重庆邮电大学光电工程学院，重庆 400065
³ 重庆邮电大学通信与信息工程学院，重庆 400065
⁴ 重庆邮电大学光电信息感测与传输技术重庆市重点实验室博士后科研工作站，重庆 400065

修回日期:2022-10-05 出版日期:2022-10-25 发布日期:2022-10-01
作者简介:李国军（1978− ），男，四川资阳人，博士，重庆邮电大学教授，主要研究方向为复杂恶劣环境超视距无线通信与网络
龙锟（1999− ），男，湖南怀化人，重庆邮电大学硕士生，主要研究方向为信道均衡
叶昌荣（1989− ），男，重庆人，博士，重庆邮电大学副教授，主要研究方向为短波通信、信号处理、异构链路融合组网等
梁佳文（1999− ），男，陕西汉中人，重庆邮电大学硕士生，主要研究方向为信道均衡
基金资助:
国家重点研发计划基金资助项目(2019YFC1511300);重庆市基础研究与前沿探索基金资助项目(cstc2021ycjh-bgzxm0072)

Iterative rake equalization method for low-complexity OTSM in high-speed mobile environment

Guojun LI¹^,², Kun LONG¹^,³, Changrong YE¹^,²^,⁴, Jiawen LIANG¹^,²

¹ Lab of Beyond LOS Reliable Information Transmission, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
² School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
³ School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
⁴ Postdoctoral Research Workstation of Chongqing Key Laboratory of Optoelectronic Information Sensing and Transmission Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Revised:2022-10-05 Online:2022-10-25 Published:2022-10-01
Supported by:
The National Key Research and Development Program of China(2019YFC1511300);Chongqing Basic Research and Frontier Exploration Project(cstc2021ycjh-bgzxm0072)

摘要/Abstract

摘要：

摘要：针对现有正交时序复用（OTSM）均衡方法抗噪性能不佳、计算复杂度高的问题，提出了一种基于最大比合并（MRC）的低复杂度迭代rake均衡器。其主要思想是利用MRC在时延-时域中迭代提取并相干合并发射符号的接收多径分量，以提高合并信号的信噪比。为加快MRC迭代算法收敛，设计了一种单抽头时频均衡器为其提供初始估计，随后结合外部纠错码进一步提高误码性能。仿真结果表明，基于MRC的迭代rake均衡器性能显著优于LMMSE线性均衡器，与目前广泛使用的高斯-赛德（GS）迭代均衡器相比，性能和计算复杂度都有较大提升。

关键词: 正交时序复用, 最大比合并, 时延-时域, 单抽头时频均衡器

Abstract:

Aiming at the problems of poor anti-noise performance and high computational complexity of the existing orthogonal time sequency multiplexing (OTSM) equalization methods, a low-complexity iterative rake equalizer based on maximum ratio combining (MRC) was proposed.The main idea was to use MRC to iteratively extract and coherently combine the received multipath components of the transmitted symbols in the delay-time domain to improve the signal-to-noise ratio of the combined signal.In order to speed up the convergence of the MRC iterative algorithm, a single-tap time-frequency equalizer was designed to provide an initial estimate, and then combined with an external error correction code to further improve the bit error performance.The simulation results show that the performance of the iterative rake equalizer based on MRC is significantly better than that of the LMMSE linear equalizer, and the performance and computational complexity are greatly improved compared with the currently widely used Gauss-Seidel (GS) iterative equalizer.

Key words: orthogonal time sequency multiplexing, maximum ratio combining, delay-time domain, single tap time-frequency equalizer

中图分类号:

TN926

李国军, 龙锟, 叶昌荣, 梁佳文. 高速移动环境下低复杂度OTSM迭代rake均衡方法[J]. 通信学报, 2022, 43(10): 86-93.

Guojun LI, Kun LONG, Changrong YE, Jiawen LIANG. Iterative rake equalization method for low-complexity OTSM in high-speed mobile environment[J]. Journal on Communications, 2022, 43(10): 86-93.

图/表 13

图1

图2

图3

图4

图5

图6

表1

MRC迭代均衡算法总计算复杂度"

步骤	计算复杂度
①	$2 N M^{'} L + N M$
②	$N M^{'} (L + P)$
③	$N M [L + 2 lb (M) + 1]$

表1

表2

图7

图8

图9

图10

图11

参考文献 19

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参数	值
子载波数M	64
符号数N	16, 32, 64
载波频率/GHz	4
子载波间隔/kHz	15
用户移动速度/(km·h^–1)	2.7~540
调制方案	QPSK，16-QAM，64-QAM
信道模型	EVA^[19]
信道多普勒频谱	Jakes
最大时延抽头数	4

高速移动环境下低复杂度OTSM迭代rake均衡方法

Iterative rake equalization method for low-complexity OTSM in high-speed mobile environment

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