Minimizing high PAPR in OFDM system using circulant shift codeword

• 發表在: Jurnal Teknologi
• 主要作者: 2-s2.0-84957893978
• 格式: Article
• 語言: English
• 出版: Penerbit UTM Press 2016
• 在線閱讀: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84957893978&doi=10.11113%2fjt.v78.4890&partnerID=40&md5=b4630f48c4da8c6c62a3c033d9dbac4d

Orthogonal Frequency Division Multiplexing (OFDM) has been widely used in various high data rate wireless communications standards. The high peak-to-average power ratio (PAPR) has however been known to be a constant problem in OFDM systems. The high PAPR in the OFDM system has led to many problems such as signal distortion, energy spilling to the adjacent channel and reducing system performance gradually. In this paper, a technique involving the manipulation of codeword using circulant shift will be introduced. The key idea of the proposed technique is to generate scramble data sequences like the conventional selective mapping (SLM) technique. The simulation results showed that the proposed technique overcame original OFDM signals and conventional SLM with a 19.5% improvement and 1.1 dB difference from conventional SLM. Besides that, the proposed technique offered a lower computationally complexity where the number of IFFT blocks can be reduced by about 57% as compared to conventional SLM. © 2016 Penerbit UTM Press. All rights reserved.