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Article · Journal of Systems Engineering and Electronics · June 25, 2019

Constant envelope FrFT OFDM: Spectral and energy efficiency analysis

School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China, Mussa Ally Dida, School of Computational and Communication Science and Engineering, Nelson Mandela African Institute of Science and Technology, Arusha 23000, Tanzania, Hao Huan, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China, Ran Tao

Didar Urynbassarova
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Abstract

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.

PAPR reduction in OFDMAdvanced Power Amplifier DesignAdvanced Wireless Communication Techniquesconstant envelope OFDMfractional Fourier transformspectral efficiency

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