The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Reducing PAPR of OFDM Signals Using Modified Partial Transmit Sequences Technique Based on Erasure Decoding

소실 복호 기반의 수정된 PTS 기법을 이용한 OFDM 신호의 PAPR 감소

  • 공민한 (원광대학교 전기전자및정보공학부 무선통신연구실) ;
  • 송문규 (원광대학교 전기전자및정보공학부 무선통신연구실)
  • Published : 2007.08.31
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Abstract

In this paper, a modified PTS(Partial Transmit Sequences) technique that uses erasure decoding of RS (Reed-Solomon) codes is presented. At the transmitter, some check symbols in a RS codeword partitioned into subblocks are phase-rotated by phase factors. The receiver decodes received codewords by regarding the phase-rotated check symbols as erasures. Hence, this technique does not need to transmit the side information about the phase factors chosen at the transmitter. The complexity of the receiver is also reduced since the estimation process for the phase factors is not required in the receiver. There is no performance degradation due to the transmission error of the side information or the estimation error of the phase factors. To evaluate the performance of the proposed PTS technique, the CCDF(Complementary Cumulative Distribution Function) of PAPR and the BER(Bit Error Rate) are compared with those of the conventional PTS techniques.

본 논문에서는 RS(Reed-Solomon) 부호의 소실 복호를 이용한 수정된 PTS(Partial Transmit Sequences) 기법을 제안한다. 송신기에서 서브블록으로 분할된 RS 부호어의 체크 심볼의 일부만을 위상 가중치에 의하여 위상 천이 한다. 수신기에서 위상 가중치에 의하여 수정된 체크 심볼을 소실로 간주하여 수신 부호어를 복호한다. 이렇게 하여 송신기에서 선택된 위상 가중치에 대한 부가 정보를 전송할 필요가 없어진다. 또한 선택된 위상 가중치에 대한 추정 과정이 불필요하므로 수신기 복잡도가 감소한다. 부가 정보의 전송 에러나 위상 가중치의 추정 에러로 인한 성능 저하도 없다. 제안한 PTS 기법의 성능을 평가하기 위해 PAPR의 CCDF(Complementary Cumulative Distribution Function)와 BER(Bit Error Rate)을 기존의 PTS 기법과 비교한다.

Keywords

References

  1. R. van Nee and R. Prasad, OFDM for Wireless Multimedia Communications, Boston, MA: Artech House, 2000
  2. J. Heiskala and J. Terry, OFDM Wireless LANs: A Theoretical and Practical Guide, Sam, 2002
  3. S.H. Han and J.H. Lee, 'An Overview of Peak-to-Average Power Ratio Reduction Techniques for Multicarrier Transmission,' IEEE Wireless Communications, vol. 12, no. 2, pp. 56-65, Apr. 2005 https://doi.org/10.1109/MWC.2005.1421929
  4. S. H. Muller and J. B. Huber, 'OFDM with Reduced Peak-ta-Average Power Ratio by Optimum Combination of Partial Transmit Sequences,' Elect. Lett., vol. 33, no. 5, pp. 368-69, Feb. 1997 https://doi.org/10.1049/el:19970266
  5. L. J. Cimini Jr. and N. R. Sollenberger, 'Peak-to-Average Power Ration Reduction of an OFDM Signal Using Partial Transmit Sequences With Embedded Side Information,' in Proc. IEEE GLOBECOM00, vol. 2, pp. 749-750, Dec. 2000
  6. A. D. S. Jayalath, C. Tellambura, 'SLM and PTS Peak-Power Reduction of OFDM Signals Without Side Information,' IEEE Trans. on Wireless Commun., vol. 4, no. 5, pp. 2006-2013, Sep. 2005 https://doi.org/10.1109/TWC.2005.853916
  7. O. Muta and Y. Akaiwa, 'A peak power reduction scheme with phase-control of clustered parity-carriers for a systematic block-coded OFDM signal,' in Proc. IEEE VTC 2003-Fall, pp. 562-566, Oct. 2003