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Method for decoding linear space-time codes in a multiple-antenna wireless transmission system and decoder therefor

  • US 20060050804A1
  • Filed: 06/13/2003
  • Published: 03/09/2006
  • Est. Priority Date: 06/14/2002
  • Status: Active Grant
First Claim
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1. An iterative method for decoding a signal vector Y obtained from N sampled signals in a space-time communication system with M transmission antennae and N receiving antennae, with N greater than or equal to M, with a view to obtaining an estimation of the symbols of the signals transmitted;

  • characterized in that each iteration comprises the following steps;

    Pre-processing of the vector Y in order to maximize the signal to noise+interference ratio in order to obtain a signal {tilde over (r)}l, Subtraction from the signal {tilde over (r)}l of a signal {circumflex over (z)}l by means of a subtractor, the signal {circumflex over (x)}l being obtained by reconstruction post-processing of the interference between symbols from the symbols estimated during the preceding iteration, Detection of the signal generated by the subtractor in order to obtain, for the iteration in progress, an estimation of the symbols of the signals transmitted;

    and in that, the N signals being processed by time intervals T corresponding to the time length of the linear space-time code associated with the transmitted signals, the pre-processing step involves the matrix B in order to maximize the signal to noise+interference ratio, the transfer function of which is;

    Bl=Diag(1ρ

    l-12


    Ail
    +N0Es
    )






    1


    i

    MT·

    CH


    Vl
    with





    Vl
    =[1-ρ

    l-12
    N0Es
    ·

    C·

    CH
    +IdN
    ]
    -1
    ;

    Al=diag

    (CH·

    Vl·

    C
    )
    ;

    wherein l;

    iteration index;

    ρ

    ;

    standardized correlation coefficient between the real symbols and the estimated symbols;

    N0;

    noise variance;

    Es;

    mean energy of a symbol;

    C;

    extended channel matrix;

    and in that the post-processing step involves a matrix D for the reconstruction of the interference between symbols, the transfer function of which is;

    Dl=Bl·

    C·

    ρ

    l-1
    -Diag(1ρ

    l-12


    Ail
    +N0Es
    )


    1


    i

    MT

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