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    Exploiting Cyclic Prefix in Turbo FDE 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 (David) and Nordholm, Sven. 2013. Exploiting Cyclic Prefix in Turbo FDE Systems Using Factor Graph, in Wireless Communications and Networking Conference (WCNC), Apr 7-10 2013, pp. 2536-2541. Shanghai, IEEE.
    Source Title
    Proceedings of the 2013 IEEE Wireless Communications and Networking Conference (WCNC)
    Source Conference
    2013 IEEE Wireless Communications and Networking Conference (WCNC)
    DOI
    10.1109/WCNC.2013.6554960
    ISBN
    9781467359382
    URI
    http://hdl.handle.net/20.500.11937/24727
    Collection
    • Curtin Research Publications
    Abstract

    This paper investigates the MMSE-based frequency domain equalization (FDE) algorithms in turbo equalization systems. As opposed to the conventional FDE systems where the cyclic prefix (CP) is discarded at the receiver, we take advantage of the redundancy and make use of all the observed signals for equalization purpose. First, we interpret the conventional frequency domain equalizer as a Forney-style factor graph (FFG), and accordingly an equalization algorithm is derived based on the Gaussian message passing (GMP) technique. Second, the normally discarded CP part is presented similarly using an FFG, and an algorithm that integrates both of the FFGs is proposed. As a result, two extrinsic messages about the data symbols are obtained rather than one, and they are merged together based on a symbol-wise combination. Third, with approximations made on two covariance matrices, the complexity of the proposed equalization algorithm is maintained at the same order as that of the conventional FDE algorithm, i.e. O(NIog2N) per block per iteration. Simulations results verify that, a gain of around 0.7dB is achieved compared with the conventional algorithm at 1/4 CP ratio, for both 16QAM and 64QAM system with Gray mapping over AWGN or ISI channels.

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