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학술대회
Iterative Decoding-Based Phase Estimation for OFDM Systems at Low Operating SNR
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- 발행일
- 200704
- 출처
- AIAA International Communications Satellite Systems Conference (ICSSC) 2007, pp.1-10
- 협약과제
- 07MR3100, 위성 IMT2000+ 기술 개발, 안도섭
- 초록
- This paper proposes a new phase estimation algorithm for turbo coded OFDM systems at low SNR. In the proposed algorithm, phase estimation process is implemented jointly with iterative decoding process. This algorithm uses extrinsic information at each decoding iteration to estimate OFDM carrier phase rotations instead of using pilots. The proposed algorithm iteratively estimates phase rotations at each OFDM carrier by averaging soft decision extrinsic information carrier by carrier. The algorithm significantly reduces pilot insertion and thus, it is suitable for low operating SNR OFDM systems. Simulation results show that the proposed algorithm achieves significantly improved phase estimation compared to the conventional pilot assisted phase estimation and it converges to perfect phase estimation case. © 2007 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
- KSP 제안 키워드
- Carrier phase, Coded OFDM, Extrinsic information, Iterative Decoding, Low SNR, OFDM systems, Pilot insertion, Soft-decision, phase estimation algorithm, simulation results