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Base station for carrier offset recovery

  • US 7,949,037 B2
  • Filed: 09/18/2006
  • Issued: 05/24/2011
  • Est. Priority Date: 05/14/1998
  • Status: Expired due to Fees
First Claim
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1. A base station for carrier-offset recovery during reception of a communication signal over an air interface using a reduced pilot signal, the base station comprising:

  • an adaptive matched filter configured to produce a filtered signal of the received signals, the adaptive matched filter being provided with filter coefficients for filtering;

    a rake receiver configured to provide relative path values of a plurality of multipath components of data on a selected channel in the received signals;

    a mixer configured to mix a correction signal with outputs from the rake receiver to generate channel impulse response estimates which works as the filter coefficients of the adaptive matched filter;

    a channel despreader for the selected channel coupled to the adaptive matched filter output configured to despread the filtered signal using the pseudo-noise signal generated for the selected channel to produce a despread channel signal of the selected channel;

    a pilot channel despreader for a pilot channel coupled to the adaptive matched filter output configured to despread the filtered signal using a pseudo-noise signal generated for the pilot channel to produce a despread pilot signal of the pilot channel;

    a hard decision processor configured to determine a symbol value of the despread channel signal of the selected channel in accordance with a modulation constellation;

    a complex conjugate processor configured to generate a complex conjugate of the symbol value generated by the hard decision processor, the complex conjugate of the symbol value becoming the correction signal;

    a phase-locked loop configured to produce a phase correction signal by measuring a phase difference of the despread pilot signal, the phase correction signal being mixed with the received signals to recover carrier offset.

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