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    Enhanced data detection in OFDM systems using factor graph

    Access Status
    Fulltext not available
    Authors
    Yang, J.
    Guo, Q.
    Huang, D.
    Nordholm, Sven
    Date
    2013
    Type
    Conference Paper
    
    Metadata
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    Citation
    Yang, Jindan and Guo,Qinghua and Huang, Defeng and Nordholm, Sven. 2013. Enhanced data detection in OFDM systems using factor graph, in Proceedings of the2 International Conference on Wireless Communications & Signal Processing (WCSDP), Oct 24-26 2013, pp. 1-5. Hanzhou, PR of China: Institute of Electrical and Electronic Engineers, Inc.
    Source Title
    Proceedings of the 2013 International Conference on Wireless Communications & Signal Processing (WCSDP)
    Source Conference
    2013 International Conference on Wireless Communications & Signal Processing (WCSDP)
    DOI
    10.1109/WCSP.2013.6677025
    URI
    http://hdl.handle.net/20.500.11937/21675
    Collection
    • Curtin Research Publications
    Abstract

    In OFDM systems, the cyclic prefix (CP) eliminates the interblock interference and enables the use of the computationally efficient single-tap equalizers at the receiver. While posing a loss in both spectrum efficiency and power efficiency, the CP brings extra information about the data which can be used for detection. Therefore, instead of discarding the CP as in the conventional OFDM systems, this paper takes advantage of the prefix redundancy and utilizes it in the soft-input soft-output equalizer of a turbo equalization system. By using factor graph, an equalization algorithm is developed, and with proper approximation, the complexity of the proposed algorithm is reduced to O(2Rlog2N + 4RG/N log2G + 2RG/N) per data symbol for R iterations, where N is the length of the block and G is equal to P + L - 1 with P the CP length and L the channel length. Simulation results show that the turbo equalization system converges within two iterations and the proposed equalization approach achieves significant gain compared to the conventional approach.

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