A Novel Hybrid Technique for PAPR Reduction of Rayleigh Fading Channel Based OFDM System

• Published in: Wireless personal communications Vol. 123; no. 4; pp. 3327 - 3346
• Main Authors: Yadav, Ajay Kumar, Prajapati, Y. K.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-04-2022; Springer Nature B.V
• Subjects: Communications Engineering; Companding; Computer Communication Networks; Distribution functions; Engineering; Error functions; Fading; Fourier transforms; Hybrid systems; Networks; Orthogonal Frequency Division Multiplexing; Performance degradation; Power amplifiers; Power spectral density; Quadrature amplitude modulation; Quadrature phase shift keying; Reduction; Signal,Image and Speech Processing; Time domain analysis; Iterative clipping and filtering; OFDM; Discrete Fourier Transform precoding matrix; NERF companding; Discrete Hartley Transform; PAPR
• ISSN: 0929-6212; 1572-834X
• DOI: 10.1007/s11277-021-09291-5

The major disadvantage of Orthogonal frequency division multiplexing (OFDM) is a high peak-to-average power ratio (PAPR) which leads to reduce the efficiency of high-power amplifier (HPA) and also degrades system performance. Therefore, a hybrid technique is proposed to minimize high PAPR of OFDM system in this paper. The hybrid technique is based on the combination of discrete Fourier transform (DFT) precoder and new error function (NERF) companding. The DFT precoder distorts signal phase to minimize PAPR. Moreover, the NERF companding technique is also employed to DFT precoded OFDM signals for further reduction of PAPR. Consequently, proposed technique (DFT precoder with NERF companding) does not only reduces PAPR but also minimizes degradation of bitt error rate (BER) performance unlike other suggested techniques. The obtained results signify that at complementary cumulative distribution function (CCDF) = 10
3
, our proposed hybrid technique suppresses PAPR up to 3.53 dB and 3.83 dB for quadrature phase shift keying (QPSK) and 16-quadrature amplitude modulation (16-QAM) respectively. The PAPR performance of the proposed technique outperforms other techniques such as discrete Hartley transform (DHT) precoder, DFT precoder, iterative clipping and filtering (ICF), DHT-ICF, DFT-ICF, NERF companding, Si-Yu Zhang Method and time-domain kernel matrix (TKM)-ICF. Further, BER, as well as power spectral density (PSD) performance of the proposed hybrid technique, provides better than ICF, DHT + ICF, DFT-ICF and NERF companding technique over Rayleigh fading channel.