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Apparatus and methods for implementing a split equalizer filter for sparse channels

  • US 20070171960A1
  • Filed: 01/24/2006
  • Published: 07/26/2007
  • Est. Priority Date: 01/24/2006
  • Status: Active Grant
First Claim
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1. A signal processing component for use in a mobile terminal operable in a wireless telecommunications system, the signal processing component for performing channel equalization operations, the channel equalization operations comprising:

  • estimating an impulse response-delay profile of a channel using a known signal, the channel being a direct sequence spread spectrum communications channel;

    determining if the impulse response-delay profile is indicative of a sparse channel;

    if the channel impulse response-delay profile is indicative of a sparse channel, selecting a first channel impulse response cluster using a pre-determined selection criterion, wherein the first channel impulse response cluster is separated from other channel impulse response clusters by a delay difference indicative of the sparse nature of the channel;

    aligning a first filter window with the first channel impulse response cluster;

    calculating channel equalization coefficients for the first filter window; and

    using the channel equalization coefficients to perform channel equalization on signals received by the mobile terminal.

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