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Interference suppression for OFDM-based UWB communication

  • US 7,355,959 B2
  • Filed: 05/28/2004
  • Issued: 04/08/2008
  • Est. Priority Date: 05/28/2004
  • Status: Expired due to Fees
First Claim
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1. A method for suppressing interference in a time-frequency hopped, ultra wide bandwidth system, comprising:

  • receiving signals corresponding to a transmitted symbol;

    frequency demodulating the received signals;

    estimating a coefficient vector w that minimizes a cost function C

    ( w n )
    = 1

    k


    λ



    n - k





    k


    λ



    n - k







    w n H



    x k
    - c k


    2
    ,
    where λ

    is a weighting factor between 0, x is a vector representing the received signals, H is a frequency response of a channel used to transmit the symbol, and c is a known training symbol;

    determining a coefficient vector ŵ

    n={circumflex over (R)}n

    1
    {circumflex over (d)}n,where a correlation matrix for the received signals is R ^ n = 1

    k


    λ



    n - k





    k


    λ



    n - k



    x k

    x k H
    ,
    and an estimate of a crosscorrelation is d ^ n = 1

    k


    λ



    n - k





    k


    λ



    n - k



    x k

    c k *
    ;

    andcombining the received signals according to c ^ n = 1 C

    ( w ^ n )


    w ^ n H

    x n
    = 1 1 - w ^ n H

    d ^ n


    w ^ n H

    x n .

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