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    NTHUR > College of Electrical Engineering and Computer Science > Department of Electrical Engineering > EE Conference Papers >  An improved adaptive receiver for OFDM systems using conjugate transmission

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    Title: An improved adaptive receiver for OFDM systems using conjugate transmission
    Authors: Chin-Liang Wang;Po-Chung Shen;Jia-Hong Huang
    Teacher: 王晉良
    Date: 2011
    Publisher: Institute of Electrical and Electronics Engineers
    Relation: Proceedings of the 2011 IEEE Vehicular Technology Conference - Spring (VTC 2011-Spring), Budapest, Hungary, MAY 15-18, 2011, Pages 1 - 5
    Keywords: OFDM
    Abstract: In this paper, we propose an improved adaptive receiver in order to overcome the performance degradation problem encountered by the existing conjugate transmission schemes due to a time-varying frequency offset. We apply two different phase rotations on the two receiving paths instead of employing only one common phase rotation for both paths in the previous work. The two phase rotations are chosen properly based on the derived optimization results, such that an additional phase distortion on the detected symbol could be completely removed. For practical use, the block least mean-squared algorithm is applied to adaptively update the two phase rotations with the frequency offset variation. Computer simulation results show that the proposed scheme outperforms the existing works in terms of bit error rate performance, especially when a rapid frequency offset variation is considered.
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    Appears in Collections:[Department of Electrical Engineering] EE Conference Papers
    [Institute of Communications Engineering] COM Conference Papers
    [Computer and Communication Research Center ] CCRC Conference Papers

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