A combined technique for carrier frequency offset estimation and peak-to-average power ratio reduction in OFDM systems using null subcarriers and Cuckoo search algorithm
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- 作者：A. S. Namitha ; S. M. Sameer
- 关键词：Orthogonal frequency division multiplexing (OFDM) ; Carrier frequency offset (CFO) ; Peak ; to ; average power ratio (PAPR) ; Complementary cumulative distribution function (CCDF) ; Cuckoo search (CS) ; Computational complexity reduction ratio (CCRR)
- 刊名：Telecommunication Systems
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：63
- 期：2
- 页码：275-285
- 全文大小：1,023 KB
- 刊物类别：Business and Economics
- 刊物主题：Economics
Business Information Systems
Computer Communication Networks
Artificial Intelligence and Robotics
Probability Theory and Stochastic Processes - 出版者：Springer Netherlands
- ISSN：1572-9451
- 卷排序：63
文摘
This paper presents a novel generic method for the carrier frequency offset (CFO) estimation and reduction of peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing based wireless communication systems. Estimation of CFO using null subcarriers embedded in one or more pilot symbol is one of the best known CFO estimation techniques that achieve an estimation range of inverse of the sampling interval with low implementation complexity. We propose to exploit a few null subcarriers in the pilot symbol for PAPR reduction by switching with some data subcarriers in the data block of which the PAPR is intended to be minimized. We define a new cost function for the PAPR reduction at the transmitter and CFO estimation at the receiver and the computational complexity of its evaluation is made significantly low by applying Cuckoo search optimization algorithm. Also, the proposed method requires less side information to be send to the receiver as compared to many of the prevailing PAPR reduction methods. Computer simulation studies reveal that the proposed combined technique offers significant performance advantage for both PAPR reduction and CFO estimation concurrently.