Title: The peak-to-average power ratio reduction using hybrid scheme with companding and discrete Hartley transform for orthogonal frequency division multiplexing system
Authors: N. Rashmi; Mrinal Sarvagya
Addresses: Department of Electronics and Communication Engineering, BMS Institute of Technology and Management, Doddaballapur Main Road, Avalahalli, Yelahanka, Bengaluru-560064, India ' Department of Electronics and Communication Engineering, REVA University, India
Abstract: Orthogonal frequency division multiplexing is a multicarrier and high data rate system. Increasing data rate through such modulation techniques increases amplitude variation with large dynamic range usually referred as peak-to-average power ratio (PAPR) in OFDM systems. As a consequence, power amplifier need to operate in linear region to avoid nonlinear distortion. In this article, to combat the nonlinearity effect in communication systems we propose a novel hybrid scheme, combined with μ-law companding and discrete Hartley transform (DHT) spread. We present the detailed simulation results for PAPR reduction for OFDM and superposition coded modulation-OFDM. It is observed that SCM-OFDM performance is much superior to OFDM. In this article we proposed a scheme for SCM-OFDM system that reduces PAPR to 1.7949 dB. The article also compares the obtained results with clipping technique, partial transmit sequence, selective mapping. The computational complexity of the system using SCM-OFDM is reduced by 50% by applying hybrid scheme.
Keywords: clipping technique; selective mapping; partial transmit sequence; discrete Hartley transform; DHT; superposition coded modulation; SCM-OFDM; modified μ-law companding; MMC; peak-to-average power ratio; PAPR; bit error rate; BER; complementary commulative distribution function; CCDF.
International Journal of Intelligent Enterprise, 2022 Vol.9 No.3, pp.303 - 317
Received: 16 May 2019
Accepted: 26 Sep 2019
Published online: 04 Jul 2022 *