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    National Tsing Hua University Institutional Repository > 電機資訊學院 > 電機工程學系 > 期刊論文 >  Maximum-likelihood detection of orthogonal space-time block coded OFDM in unknown block fading channels


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/42266


    Title: Maximum-likelihood detection of orthogonal space-time block coded OFDM in unknown block fading channels
    Authors: Chang, Tsung-Hui;Ma, Wing-Kin;Chi, Chong-Yung
    教師: 祈忠勇
    Date: 2008
    Publisher: Institute of Electrical and Electronics Engineers
    Relation: IEEE TRANSACTIONS ON SIGNAL PROCESSING , Volume 56 , Issue 4 , Pages 1637-1649 , APR 2008
    Keywords: FREQUENCY-SELECTIVE CHANNELS
    BLIND ML DETECTION
    SEMIDEFINITE RELAXATION
    MULTIUSER DETECTION
    SYSTEMS
    IDENTIFIABILITY
    EQUALIZATION
    MULTIPATH
    DIVERSITY
    DESIGNS
    Abstract: © 2008 Institute of Electrical and Electronics Engineers-For orthogonal space-time block coded orthogonal frequency division multiplexing (OSTBC-OFDM) systems, many of the existing blind detection and channel estimation methods rely on the assumption that the channel is static for many OSTBC-OFDM blocks. This paper considers the blind (semiblind) maximum-likelihood (NIL) detection problem of OSTBC-OFDM with a single OSTBC-OFDM block only. The merit of such an investigation is the ability to accommodate channels with shorter coherence time. We examine both the implementation and identifiability issues, with a focus on BPSK or QPSK constellations. In the implementation, we propose reduced-complexity detection schemes using subchannel grouping. In the identifiability analysis, we show that the proposed schemes can ensure a probability one identifiability condition using very few number of pilots. For example, the proposed semiblind detection scheme only requires a single pilot code for unique data identification; while the conventional pilot-based channel estimation method requires L pilots where L denotes the channel length. Our simulation results demonstrate that the proposed schemes can provide performance close to that of their nonblind counterparts.
    URI: http://www.ieee.org/
    http://nthur.lib.nthu.edu.tw/handle/987654321/42266
    Appears in Collections:[電機工程學系] 期刊論文

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