Title: Performance of an adaptive compander in wireless mobile communication systems

Authors: A.O. Beena; Sakuntala S. Pillai

Addresses: Department of Electronics and Communication Engineering, Saintgits College of Engineering, Kottukulam Hills, Pathamuttom P.O., Kottayam – 686532 Kerala, India ' Department of Electronics and Communication Engineering, Mar Baselios College of Engineering and Technology, Mar Ivanios Vidyanagar, Nalanchira, Paruthippara, Thiruvananthapuram – 695015 Kerala, India

Abstract: The most popular technique used for high data rate services in 4G scenario is MIMO-OFDM. Space-time block codes have been recommended for high diversity gain in MIMO communication systems. Due to comparatively simpler design and less decoding complexity orthogonal STBCs are very attractive. In this paper, we propose a novel adaptive companding method for peak to average power ratio reduction in IEEE 802.16 standards used in 4G wireless mobile communications with orthogonal space time block coded MIMO-OFDM systems. This is obtained by fixing compander parameters independently for statistically unrelated symbols in OFDM waveform and according to the features of input symbols. The bit error rate performance analysis of the proposed system under Rayleigh fading MIMO channel conditions has also been presented. Simulation results showed that the proposed method performs better for a given PAPR preset value and a slight improvement in the BER performance was observed over fixed compander.

Keywords: multiple-input multiple-output; orthogonal frequency division multiplexing; orthogonal space time block codes; OSTBC; peak to average power ratio; PAPR; adaptive companding; QAM; BER.

DOI: 10.1504/IJMC.2019.102084

International Journal of Mobile Communications, 2019 Vol.17 No.5, pp.625 - 639

Received: 05 Jul 2017
Accepted: 24 Jun 2018

Published online: 23 May 2019 *

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