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Design and Performance Evaluation of the DFT-Spread OFDM Communication System for Phase Noise Compensation and PAPR Reduction  

Li Ying-Shan (Department of Electronic Engineering and Research Institute of Computer, Information & Communication, Chungbuk National University)
Kim Nam-Il (Department of Electronic Engineering and Research Institute of Computer, Information & Communication, Chungbuk National University)
Kim Sang-Woo (Department of Electronic Engineering and Research Institute of Computer, Information & Communication, Chungbuk National University)
Ryu Heung-Gyoon (Department of Electronic Engineering and Research Institute of Computer, Information & Communication, Chungbuk National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.17, no.7, 2006 , pp. 638-647 More about this Journal
Abstract
Recently, the DFT-Spread OFDM has been studied for the PAPR reduction. However, the DFT-Spread OFDM produces more ICI and SCI problems than OFDM because phase offset mismatch of the DFT spreading code results from the random phase noise in the oscillator. In this paper, at first, phase noise influence on the DFT-Spread OFDM system is theoretically analyzed in terms of the BER performance. Then, the conventional ICI self-cancellation methods are discussed and two kinds of ICI self-cancellation methods are newly proposed. Lastly, a new DFT-Spread OFDM system which selectively adopts the ICI self-cancellation technique is proposed to resolve the interference problem and PAPR reduction simultaneously. Proposednew DFT-Spread OFDM system can minimize performance degradation caused by phase noise, and still maintain the low PAPR property. Among the studied methods, DFT-Spread OFDM with data-conjugate method or newly proposed symmetric data-conjugate method show the significant performance improvements, compared with the DFT-Spread OFDM without ICI self-cancellation schemes. The data-conjugate method is slightly better than symmetric data-conjugate method.
Keywords
DFT-Spread OFDM; Phase Noise; ICI; Data-Conjugate; Symmetric Data-Conjugate;
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