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Constant envelope FrFT OFDM: spectral and energy efficiency analysis

查看全文 作　　者：DIDA Mussa [1,2]Ally;HUAN [1]Hao;TAO [1]Ran;WANG [1]Teng;URYNBASSAROVA [1]Didar 高影响力作者 机构地区：[1]School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China;[2]School of Computational and Communication Science and Engineering, Nelson Mandela African Institute of Science and Technology, Arusha 23000, Tanzania高影响力机构 出　　处：《Journal of Systems Engineering and Electronics》索引2019年第30卷第3期,共7页高影响力期刊 摘　　要：Constant envelope with a fractional Fourier transformorthogonal frequency division multiplexing(CE-FrFT-OFDM)is a special case of a constant envelope OFDM(CE-OFDM),both being energy efficient wireless communication techniques with a 0 dB peak to average power ratio(PAPR).However,with the proper selection of fractional order,the first technique has a high bit error rate(BER)performance in the frequency-time selective channels.This paper performs further analysis of CE-FrFT-OFDM by examining its spectral efficiency(SE)and energy efficiency(EE)and compare to the famous OFDM and FrFT-OFDM techniques.Analytical and comprehensive simulations conducted show that,the CE-FrFT-OFDM has five times the EE of OFDM and FrFT-OFDM systems with a slightly less SE.Increasing CE-FrFT-OFDM’s transmission power by increasing its amplitude to 1.7 increases its SE to match that of the OFDM and FrFT-OFDM systems while slightly reducing its EE by 20%to be four times that of OFDM and FrFTOFDM systems.OFDM and FrFT-OFDM’s amplitude fluctuations cause rapid changing output back-off(OBO)power requirements and further reduce power amplifier(PA)efficiency while CE-FrFTOFDM stable operational linear range makes it a better candidate and outperforms the other techniques when their OBO exceeds 1.7.Higher EE and low BER in time-frequency selective channel are attracting features for CE-FrFT-OFDM deployment in mobile devices. 关 键 词：fractional FOURIER transform (FrFT) constant ENVELOPE SPECTRAL EFFICIENCY (SE) energy EFFICIENCY (EE) high power AMPLIFIER
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