Modified Alternative-signal Technique for Sequential Optimisation for PAPR Reduction in OFDM-OQAM Systems

  • M.V.R. Vittal G. Pulla Reddy Engineering College, Kurnool - 518 007
  • K. Rama Naidu JNTUA college of Engineering, Ananthapuramu - 515 002
Keywords: Alternative signal, Orthogonal frequency division multiplexing, Peak to average power ratio, Complementary cumulative distribution function

Abstract

A modified alternative signal technique for reducing peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing systems employing offset quadrature amplitude modulation (OFDM-OQAM) is proposed. Lower PAPR reduces the complexity of digital to analog converters and results in increasing the efficiency of power amplifiers. The main objective of the algorithm is to decrease PAPR with low complexity. The alternative signal method involves the individual alternative signal (AS-I) and combined alternative signal (AS-C) algorithms. Both the algorithms decrease the peak to average power ratio of OFDM-OQAM signals and AS-C algorithm performs better in decreasing PAPR. However the complexity of AS-C algorithm is very high compared to that of AS-I. To achieve reduction in PAPR with low complexity, modified alternative signal technique with sequential optimisation (MAS-S) is proposed. The quantitative PAPR analysis and complexity analysis of the proposed algorithm are carried out. It is demonstrated that MAS-S algorithm simultaneously achieves PAPR reduction and low complexity.

Author Biographies

M.V.R. Vittal, G. Pulla Reddy Engineering College, Kurnool - 518 007

Mr M.V.R. Vittal received the BTech (ECE) from Sri Venkateswara University, Tirupati, in 2001, and MTech (Communication Syst.) from VIT University, Vellore, in 2004. Presently pursuing his PhD in the Department of ECE with Jawaharlal Nehru Technological University, (JNTU), Ananthapuramu, India. His current research interests are : Wireless communication particularly PAPR reduction in OFDM systems, signal processing applications for OFDM.

K. Rama Naidu, JNTUA college of Engineering, Ananthapuramu - 515 002
Dr K. Rama Naidu received the BTech (Electro. Comm. Eng.) from Jawaharlal Nehru Technological University, Ananthapuramu in 1983, the MTech (Microwave Engineering) from Indian Institute of Technology, Banaras Hindu University, in 1990 and PhD from Indian Institute of Technology, Kharagpur, in 2009, respectively. At present, he is working as a Professor in the Department of ECE at JNTUA, Ananthapuramu. His research interests include : Wireless communications specifically PAPR reduction in OFDM, channel estimation, cognitive radios.
Published
2017-04-25
How to Cite
Vittal, M., & Naidu, K. (2017). Modified Alternative-signal Technique for Sequential Optimisation for PAPR Reduction in OFDM-OQAM Systems. Defence Science Journal, 67(3), 298-307. https://doi.org/10.14429/dsj.67.10642
Section
Electronics & Communication Systems