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

Abstract

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

CLC Number:

TN929.5

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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References 22

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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

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

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