多模索引调制OFDM频谱及能量效率优化方案

doi:10.3969/j.issn.1001-506X.2020.03.029

Abstract

Abstract:

To improve the energy efficiency (EE) and spectrum efficiency (SE) of the multiple-mode orthogonal frequency division multiplexing with index modulation, an optimization scheme and a corresponding detection algorithm are proposed. The scheme increases the number of constellation mode permutations to increase the index bit information without reducing the minimum Euclidean distance betweensub-blocks, thus enhancing the SE of the system. In addition, by using no-load mode, the scheme transmits part of the information without consuming energy, thereby improving EE. Meanwhile, an improved low complexity maximum likelihood detection algorithm is proposed to further reduce the detection complexity of mode permutations. The effect of the increased constellation permutation mode and no-load mode on the bit error rate (BER) of the system is analyzed, and the multi-mode constellation after adding no-load mode is optimized accordingly. Simulation results show that BER performance of the optimization scheme is superior, and SE is enhanced while EE gain is obtained.

Key words: index modulation (IM), orthogonal frequency division multiplexing (OFDM), energy efficiency (EE), spectral efficiency (SE), maximum likelihood detection (MLD)

CLC Number:

TN911.3

Ling ZHUANG, Lei DAI, Shengzhu LIU, Guangyu WANG. Optimized scheme for spectrum and energy efficiency of multiple-mode OFDM with index modulation[J]. Systems Engineering and Electronics, 2020, 42(3): 719-726.

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References 25

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索引比特信息	索引全排列L^?	子块S_m
000	{1 2 3}	{0 S₂ S₃}
001	{2 1 3}	{S₂ 0 S₃}
010	{3 1 2}	{S₃ 0 S₂}
011	{1 3 2}	{0 S₃ S₂}
100	{3 2 1}	{S₃ S₂ 0}
101	{1 1 1}	{0 0 0}
110	{2 2 2}	{S₂ S₂S₂}
111	{3 3 3}	{S₃ S₃S₃}

系统	参数配置
系统	k=2, M=2	k=3, M=2	k=3, M=4
MM-OFDM-IM	1.5	1.67	2.67
MP-MM-OFDM-ESIM	1.67	2.25	3
MM-OFDM-IM-IQ	3	3.33	5.33
MP-MM-OFDM-ESIM-IQ	3.33	4.5	6

MP-MM-OFDM-ESIM (-IQ)(M, k, n)	MLD	LC-MLD	改进LC-MLD
MP-MM-OFDM-ESIM(2, 2, 3)	32	9	5
MP-MM-OFDM-ESIM(2, 3, 4)	512	15	7
MP-MM-OFDM-ESIM-IQ(2, 2, 3)	64	18	10
MP-MM-OFDM-ESIM-IQ(2, 3, 4)	1 024	30	14

参数	配置
系统子载波数N	255/256
CP	16
分块方式	交织分块
信道	瑞利衰落信道
信道估计方式	理想
解调方式	ML/改进LC-MLD

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Optimized scheme for spectrum and energy efficiency of multiple-mode OFDM with index modulation

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