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。
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.
作者
曾孝平
毛海伟
杨凡
简鑫
李诗琪
蒋欣
方伟
ZENG Xiaoping;MAO Haiwei;YANG Fan;JIAN Xin;LI Shiqi;JIANG Xin;FANG Wei(The College of Communication Engineering,Chongqing University,Chongqing 400044,China;School of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 400054,China;Beijing Aeronautical Science&Technology Research Institute,Beijing 102211,China)
出处
《通信学报》
EI
CSCD
北大核心
2018年第9期31-42,共12页
Journal on Communications
基金
国家自然科学基金资助项目(No.61501065
No.61571069
No.61701054
No.61601067)
重庆市基础科学与前沿技术研究专项基金资助项目(No.cstc2016jcyjA0021)
中央高校基本科研业务资金资助项目(No.106112017CDJQJ168817
No.2018CDXYTX0009
No.2018CDYJSY0055)~~
