Wireless Personal Communications

, Volume 83, Issue 3, pp 2225–2248 | Cite as

PAR Reduction in SU/MU-MIMO OFDM Systems Using OPF Precoding Over the Nonlinearity of SSPA

Article
First Online:

Abstract

Orthogonal frequency division multiplexing (OFDM) system suffers from a high peak-to-average (power) ratio (PAR) which leads to power inefficiency in radio frequency section and large performance degradation of system due to the nonlinearity of high power amplifiers (HPA). In this paper, a new downlink transmission scheme is designed based on orthogonal periodic function (OPF) precoding to achieve low PAR and investigated for single user and multi-user multiple-input multiple-output wireless systems. It is shown (through mathematical analysis and computer simulations) that the proposed transmission scheme can provide a significant PAR reduction using decorrelation, phase-rotation and orthogonality properties of OPF precoding, while it does not change power spectral levels or error performances due to the unitary property when compared with the normal OFDM systems with linear HPA. The OPF precoding outperforms existing precoding schemes when nonlinear solid state power amplifier (SSPA) is considered with several practical values of input back-off (IBO). Computer simulations show that the OPF precoding can achieve 3.1 and 4 dB PAR gain, while 2.2 and 1 dB SNR gain for IEEE 802.11a and DVB-T systems respectively. Moreover, OPF precoding leads to a total degradation improvement from 0.13 to 1.53 dB for 16 QAM, considering an SSPA with IBO = 8–4 dB respectively. OPF precoding does not increase computational complexity when compared with the existing precoding methods. It is shown that the performance of the proposed precoding is independent of modulation schemes and can work for any number of subcarriers.

Keywords

OFDM PAR OPF SSPA IBO/OBO TD 
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Notes

Acknowledgments

The author would like to thank the anonymous reviewers for providing useful comments and suggestions which have enhanced the quality of this paper. Additionally, their queries while reading the paper have been useful in improving the quality of the paper and the contents covered.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Electronics and Communication EngineeringUniversity of Information Technology and SciencesDhakaBangladesh

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