Nakagami-m衰落信道下D2D通信自适应调制算法研究

doi:10.11959/j.issn.1000-436x.2018151

通信学报 ›› 2018, Vol. 39 ›› Issue (9): 31-42.doi: 10.11959/j.issn.1000-436x.2018151

• 论文Ⅰ：5G及认知协作网络 • 上一篇下一篇

Nakagami-m衰落信道下D2D通信自适应调制算法研究

曾孝平¹(),毛海伟¹,杨凡²,简鑫¹,李诗琪¹,蒋欣¹,方伟³

¹ 重庆大学通信工程学院，重庆 400044
² 重庆理工大学电气与电子工程学院，重庆 400054
³ 北京民用飞机技术研究中心，北京 102211

修回日期:2018-08-16 出版日期:2018-09-01 发布日期:2018-10-19
作者简介:曾孝平（1956-），男，四川广安人，博士，重庆大学教授、博士生导师，主要研究方向为航空移动通信、下一代移动通信、生物信号处理等。|毛海伟（1994-），男，湖南邵阳人，重庆大学硕士生，主要研究方向为无线宽带自适应传输。|杨凡（1983-），男,湖北广水人，博士，重庆理工大学副教授，主要研究方向为无线宽带自适应传输、无线通信网络、下一代移动通信技术、无线通信中的编码技术等。|简鑫（1987-），男，四川自贡人，博士，重庆大学副教授，主要研究方向为统计数学、无线通信理论与技术、流量分析论等。|李诗琪（1996-），女，湖北潜江人，重庆大学硕士生，主要研究方向为干扰检测。|蒋欣（1970-），男，四川达州人，博士，北京民用飞机技术研究中心研究员，主要研究方向为航空电子系统综合设计技术和机载系统技术。|方伟（1978-），男，山东诸城人，博士，北京民用飞机技术研究中心高级工程师，主要研究方向为航空电子系统、机载宽带通信技术等。
基金资助:
国家自然科学基金资助项目(61501065);国家自然科学基金资助项目(61571069);国家自然科学基金资助项目(61701054);国家自然科学基金资助项目(61601067);重庆市基础科学与前沿技术研究专项基金资助项目(cstc2016jcyjA0021);中央高校基本科研业务资金资助项目(106112017CDJQJ168817);中央高校基本科研业务资金资助项目(2018CDXYTX0009);中央高校基本科研业务资金资助项目(2018CDYJSY0055)

Study on adaptive modulation in D2D communications over Nakagami-m fading channel

Xiaoping ZENG¹(),Haiwei MAO¹,Fan YANG²,Xin JIAN¹,Shiqi LI¹,Xin JIANG¹,Wei FANG³

¹ The College of Communication Engineering,Chongqing University,Chongqing 400044,China
² School of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 400054,China
³ Beijing Aeronautical Science ＆Technology Research Institute,Beijing 102211,China

Revised:2018-08-16 Online:2018-09-01 Published:2018-10-19
Supported by:
The National Natural Science Foundation of China(61501065);The National Natural Science Foundation of China(61571069);The National Natural Science Foundation of China(61701054);The National Natural Science Foundation of China(61601067);The Chongqing Research Program of Basic Research and Frontier Technology(cstc2016jcyjA0021);The Central University Basic Business Expenses Special Funding for Scientific Research Project(106112017CDJQJ168817);The Central University Basic Business Expenses Special Funding for Scientific Research Project(2018CDXYTX0009);The Central University Basic Business Expenses Special Funding for Scientific Research Project(2018CDYJSY0055)

摘要/Abstract

摘要：

针对Nakagami-m衰落信道中，D2D（device to device）通信频谱利用率低的问题，设计一种基于非数据辅助误差矢量幅度（NDA-EVM,nondata-aided error vector magnitude）的自适应调制算法。以NDA-EVM作为信道质量评估参量，根据最大似然准则建立NDA-EVM与误码率（SER,symbol error ratio）的定量关系，据此设计SER约束下的MQAM调制方式切换机制；结合有限状态马尔可夫信道模型以及数据缓存处理，分析系统的分组丢失性能和频谱利用率。理论分析和仿真实验表明，基于NDA-EVM的自适应调制算法在不同调制方式的阈值下的准确性，明确系统QoS与分组丢失率的关系；在保持低算法复杂度的同时，提高了系统频谱利用率，对比传统算法，频谱利用率提升了0.752 bit·(s·Hz)^-1。

关键词: Nakagami-m衰落信道, D2D, 自适应调制, 误差矢量幅度

Abstract:

A novel adaptive modulation based on nondata-aided error vector magnitude (NDA-EVM) was proposed to solve the problem of lower spectral efficiency in device to device (D2D) communication over Nakagami-m fading channel.The NDA-EVM was used to evaluate the channel quality.The relationship between NDA-EVM and symbol error ratio (SER) was derived according to the maximum likelihood method.Thereafter,the adaptive modulation mechanism of MQAM with the SER constraint was designed.Considering the joint effect of finite-length queuing and fading channel,the system packet loss rate and spectral efficiency was analyzed.Theoretical analysis and simulation experiments show that NDA-EVM based adaptive modulation accurately gives the modulation threshold and evaluates the relationship between QoS and packet loss rate,the proposed algorithm improves system spectral efficiency while maintaining low algorithm complexity,spectral efficiency improves by 0.752 bit·(s·Hz)^-1,compared with traditional algorithm.

Key words: Nakagami-m fading channel, D2D, adaptive modulation, error vector magnitude

中图分类号:

TN929.5

曾孝平,毛海伟,杨凡,简鑫,李诗琪,蒋欣,方伟. Nakagami-m衰落信道下D2D通信自适应调制算法研究[J]. 通信学报, 2018, 39(9): 31-42.

Xiaoping ZENG,Haiwei MAO,Fan YANG,Xin JIAN,Shiqi LI,Xin JIANG,Wei FANG. Study on adaptive modulation in D2D communications over Nakagami-m fading channel[J]. Journal on Communications, 2018, 39(9): 31-42.

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算法步骤	计算公式	复杂度
初始化	M₀=QAM	O (1)
NDA-EVM计算	式(6)	O (M_m)
SER计算	式(15)	O (M_m)
调制方式选择	max M_n=M(n)	O (1)
	s.t SER[M(n)]≤SER_th
算法时间复杂度		O (M_m)

仿真参数	数值
发送功率P₀	1W
发送符号数量	10⁹
帧长T_f	1 ms
数据分组长N_b	1 080 bit
调制方式选择	NoTx/4/16/64/256QAM
一个调制符号含比特数R_n	2/4/6/8

Nakagami-m衰落信道下D2D通信自适应调制算法研究

Study on adaptive modulation in D2D communications over Nakagami-m fading channel

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