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학술대회 Modified Dummy Sequence Insertion Method for PAPR Reduction of OFDM Signal
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이재권, 박정상, 김진업
Vehicular Technology Conference (VTC) 2007 (Fall), pp.1265-1268
07MM1300, 4세대 이동통신용 적응 무선접속 및 전송 기술개발, 김진업
One of the major drawbacks of the OFDM system is a large peak to average power ratio. This leads to performance degradation due to nonlinear distortion in the high power amplifier. In this paper, we propose a modified dummy sequence insertion (m-DSI) method whereby low complexity and high PAPR reduction can be realized in OFDM system. The m-DSI method designs the sequence that achieves low covariance value with other sequences. After IFFT operation, the m-DSI sequence with the lowest PAPR is selected for transmission. Also, in order to reduce the IFFT complexity, the N-point IFFT block is divided into two sub-IFFT blocks due to avoiding the repeated calculation of IFFT operation. Simulation results of the m-DSI method in comparison with the DSI method are presented. The results demonstrate that the m-DSI method yields superior PAPR performance and lower IFFT complexity than the DSI method with almost the same BER performance while utilizing the same number of dummy bits. © 2007 IEEE.
KSP 제안 키워드
BER performance, Dummy sequence insertion(DSI), High PAPR, High power amplifier(HPA), Insertion method, OFDM signal, OFDM systems, PAPR Reduction, Peak-to-Average-Power-Ratio(PAPR), low-complexity, nonlinear distortion