대한전자공학회논문지TC (Journal of the Institute of Electronics Engineers of Korea TC)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

OFDM polar transmitter에서 피크 윈도잉 기반의 PAPR 감소기법의 성능평가

Performance Evaluation of a Peak Windowing-Based PAPR Reduction Scheme in OFDM Polar Transmitters

  • 서만중 (숭실대학교 정보통신전자공학부) ;
  • 심희성 (숭실대학교 정보통신전자공학부) ;
  • 임성빈 (숭실대학교 정보통신전자공학부) ;
  • 정재호 (한국전자통신연구원) ;
  • 이광천 (한국전자통신연구원)
  • Seo, Man-Jung (School of Electronic Engineering, Soongsil University) ;
  • Shin, Hee-Sung (School of Electronic Engineering, Soongsil University) ;
  • Im, Sung-Bin (School of Electronic Engineering, Soongsil University) ;
  • Jung, Jae-Ho (Electronics and Telecommunications Research Institute) ;
  • Lee, Kwang-Chun (Electronics and Telecommunications Research Institute)
  • 발행 : 2008.12.25
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초록

차세대 무선 통신 시스템은 멀티밴드/멀티모드 동작이 가능한 RF 송수신기를 필요로 하고 있다. Polar transmitter는 효율적인 switched-mode RF 전력증폭기를 사용함으로써 높은 효율성을 얻을 수 있기 때문에 EDGE (Enhanced Data Rates for GSM Evolution), WCDMA (Wideband Code Division Multiple Access) 및 WLAN (Wireless Local Area Network)과 같이 고속의 데이터 전송율을 지원하는 시스템에 적합한 것으로 알려져 있다. 본 논문에서는 수신단의 구조에 변화를 주지 않으며 또한 추가적인 정보의 전송이 필요 없이 기존 수신기를 그대로 사용할 수 있는 PAPR (Peak-to-Average Power Ratio) 감소기법을 OFDM (Orthogonal Frequency Division Multiplexing) polar transmitter에 적용하여 그 성능을 평가하였다. 이 방법은 polar 변조된 신호에 대하여 피크 윈도잉을 사용한 것으로 다양한 윈도우 형태와 길이를 적용하여 비트오율 (Bit Error rate; BER)과 오차 벡터 크기 (Error Vector Magnitude; EVM)를 측정하였다. 모의실험 결과, 제안된 기법은 효율적인 PAPR 감소와 더불어 클리핑으로 인한 대역의 왜곡 (out-of-band distortion)이 감소함을 관측하였다.

Next generation wireless communication systems require RF transceivers that enable multiband/multimode operations. Polar transmitters are known as good candidates for high data rate systems such as EDGE (Enhanced Data Rates for GSM Evolution), WCDMA (Wideband Code Division Multiple Access), and WLAN (Wireless Local Area Network) because they can obtain high efficiency by using efficient switched-mode RF power amplifiers. In this paper, we investigate the performance of a simple peak windowing scheme for the OFDM (Orthogonal frequency Division Multiplexing) polar transmitter, which requires no change of a receiver structure or no additional information transmission. The approach we employed is to apply the peak windowing scheme to the amplitude modulated signals of the polar transmitter to reduce the PAPR (Peak-to-Average Power Ratio). The BER (Bit Error Rate) and EVM (Error Vector Magnitude) performances are measured for various window types and lengths. The simulation results demonstrate that the proposed algorithm mitigates out-of-band distortion introduced by clipping along with PAPR reduction.

키워드

참고문헌

  1. John Groe, "Polar Transmitters for Wireless Communications," IEEE Commun., Vol. 45, No. 9, pp. 58-63, Set. 2007
  2. 김준형, 정재호, 권헌국, 이광천, "차세대 RF 트랜시버 기술 동향," 전자통신동향분석, Vol. 23, No. 3, pp. 72-81, 2008년 6월
  3. M. Talonen and S. Lindfors, "System Requirements for OFDM Polar Transmitter," Proc. Circuit Theory and Design 2005, Vol. 3, pp. 69-72, Aug. 2005
  4. Ramjee Prasad, OFDM for Wireless Communications Systems, Artech House, 2004
  5. S.C. Cripps, RF Power Amplifiers for Wireless Communications, Northwood, MA: Artech House, 1999
  6. L.R. Kahn, "Single sideband transmission by envelope elimination and restoration," Proc. IRE, Vol. 40, No. 7, pp. 803-806, Jul. 1952
  7. Patrick Reynaert and Micheil S.J. Steyaert, "A 1.75 GHz Polar Modulated CMOS RF Power Amplifier for GSM-EDGE," IEEE J. Solid-state Circuits, Vol. 40, No. 12, Dec. 2005
  8. O. Vaananen, J. Vankka, and K. Halonen, Effect of Clipping in Wideband CDMA System and Simle Algorithm for Peak Windowing, Helsinki University of Technology, 2002
  9. O. Vaananen, J. Vankka, and K. Halonen, "Simple algorithm for peak windowing and its application in GSM, EDGE and WCDMA systems," IEE Proc.-Commun., Vol. 152, No. 3, pp. 357-362, Jun. 2005 https://doi.org/10.1049/ip-com:20059014