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Dummy Sequence Insertion for PAPR Reduction of OFDM Communication System  

이재은 (충북대학교 전자공학과 및 컴퓨터정보통신연구소)
유흥균 (충북대학교 전자공학과 및 컴퓨터정보통신연구소)
정영호 (한국전자통신연구원 전파방송연구소 이동멀티미디어방송연구팀)
함영권 (한국전자통신연구원 전파방송연구소 이동멀티미디어방송연구팀)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.14, no.12, 2003 , pp. 1239-1247 More about this Journal
Abstract
OFDM(orthogonal frequency division multiplexing) communications system is very attractive for the high data rate transmission in the frequency selective lading channel. Since OFDM has high PAPR(peak-to-average power ratio), OFDM signal may be distorted by the nonlinear HPA(high power amplifier). In this paper, we propose the DSI(dummy sequence insertion) method for OFDM communication system. Some sub-carriers are inserted for PAPR reduction. They carry the specified dummy data sequence which are used for only PAPR reduction and do not work as side information like the conventional PTS(partial transmit sequence) or SLM(selected mapping) method. We use the complementary sequence and the combination of the correlation sequence as the dummy sequence. Flipping technique is used for the DSI method to get the effective PAPR reduction. It is important that BER of the proposed method is independent of the damage of the dummy data sequence. And DSI method has better spectral efficiency than the conventional block coding. On the other hand, threshold PAPR method is applied to cut down the processing time. However, this DSI method is not better than the conventional PTS method in the respect of the PAPR reduction performance. The DSI method includes the threshold PAPR lower than the PAPR of the OFDM signal, reduces the processing time and improves the BER performance.
Keywords
OFDM; PAPR; DSI(dummy sequence insertion) and HPA;
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