Journal of Systems Engineering and Electronics ›› 2019, Vol. 30 ›› Issue (3): 467-473.doi: 10.21629/JSEE.2019.03.04

• Electronics Technology • Previous Articles     Next Articles

Constant envelope FrFT OFDM: spectral and energy efficiency analysis

Mussa Ally DIDA1,2(), Hao HUAN1(), Ran TAO1(), Teng WANG1(), Didar URYNBASSAROVA1,*()   

  1. 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
  • Received:2017-01-17 Online:2019-06-01 Published:2019-07-04
  • Contact: Didar URYNBASSAROVA E-mail:mussa.ally@nm-aist.ac.tz;huanhao@bit.edu.cn;taoran@bit.edu.cn;wangteng@bit.edu.cn;didaruzh@mail.ru
  • About author:DIDA Mussa Ally was born in 1983. He received his Ph.D. degree in Information and Communication Engineering from Beijing Institute of Technology in 2017, Ms.c. in Telecommunications Engineering from University of Dodoma in 2011, and B.Sc. in Computer Engineering and Information Technology from University of Dar es Salaam in 2008. Currently he is working as a lecturer at Nelson Mandela African Institute of Science and Technology in Arusha, Tanzania. His research interests are in the field of digital signal processing, fractional fourier signals and systems, single carrier and multicarier systems. E-mail:mussa.ally@nm-aist.ac.tz|HUAN Hao was born in 1983. He received his B.S. degree from Zhengzhou Univerversity and Ph.D. degree from Beijing Institute of Technology in 2013. In 2016 he was a visiting scholar in the University of Delaware, State of delaware, USA. He is currently a lecturer with the school of Information and Electronics, Beijing Institute of Technology. His research interests include physical layer security for wireless communication, satellite communication, and radar signal processing. E-mail:huanhao@bit.edu.cn|TAO Ran was born in 1964. He received his B.S. degree from Hefei College of Electronic Engineering, Hefei, in 1985 and the M.S. and Ph.D. degrees from Harbin Institute of Technology, Harbin, in 1990 and 1993, respectively. In 2001, he was a senior visiting scholar in the University of Michigan, Ann Arbor. He is currently a professor with the School of Information and Electronics, Beijing Institute of Technology, Beijing, China. He has been a distinguished professor of Changjiang Scholars Program since 2009 and a chief professor of the Program for Changjiang Scholars and Innovative Research Team in University since 2010. His current research interests include fractional Fourier transform with applications, theory and technology for radar and communication systems. E-mail:taoran@bit.edu.cn|WANG Teng was born in 1988. He is currently a Ph.D. candidate at the School of Information and Electronics of Beijing Institute of Technology, China. His research interests lie in the field of physical layer security for wireless communication, timefrequency analysis, fractional Fourier transform and satellite communication. E-mail:wangteng@bit.edu.cn|URYNBASSAROVA Didar was born in 1990. She received her B.Ed. degree in mathematics from Aktobe State Pedagogical Institute, Aktobe, Kazakhzstan, in 2011 and her M.S. degree from the Aktobe State University named after K. Zhubanov, Aktobe, Kazakhstan, in 2013, and Ph.D. degree from Beijing Institute of Technology, Beijing, China, in 2018. Her research interests are in the areas of the Fourier transform, linear canonical transform, time-frequency signal processing, and signal processing for radar and communications. E-mail:didaruzh@mail.ru

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.

Key words: fractional Fourier transform (FrFT), constant envelope, spectral efficiency (SE), energy efficiency (EE), high power amplifier