BASE STATION FOR CARRIER OFFSET RECOVERY
First Claim
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 for producing a filtered signal of the received signals, the adaptive matched filter being provided with filter coefficients for filtering;
a rake receiver for providing relative path values of a plurality of multipath components of data on a selected channel in the received signals;
a mixer for mixing 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 said selected channel coupled to said adaptive matched filter output for despreading said filtered signal using the pseudo-noise signal generated for said selected channel to produce a despread channel signal of said selected channel;
a pilot channel despreader for a pilot channel coupled to said adaptive matched filter output for despreading said filtered signal using a pseudo-noise signal generated for said pilot channel to produce a despread pilot signal of said pilot channel;
a hard decision processor for determining a symbol value of the despread channel signal of the selected channel in accordance with a modulation constellation;
a complex conjugate processor for generating 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 for producing 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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Abstract
A base station for carrier offset recovery. An adaptive matched filter produces a filtered signal. A rake receiver provides relative path values of multipath components. A mixer generates channel impulse response estimates. A channel despreader despreads the filtered signal using the pseudo-noise signal generated to produce a despread channel signal of the selected channel. A pilot channel despreader despreads the filtered signal using a pseudo-noise signal generator to produce a despread pilot signal of the pilot channel. A hard decision processor determines a symbol value of the despread channel signal. A complex conjugate processor generates a complex conjugate of the symbol value as a correction signal. A phase-locked loop produces a phase correction signal to recover carrier offset.
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Citations
14 Claims
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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:
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an adaptive matched filter for producing a filtered signal of the received signals, the adaptive matched filter being provided with filter coefficients for filtering;
a rake receiver for providing relative path values of a plurality of multipath components of data on a selected channel in the received signals;
a mixer for mixing 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 said selected channel coupled to said adaptive matched filter output for despreading said filtered signal using the pseudo-noise signal generated for said selected channel to produce a despread channel signal of said selected channel;
a pilot channel despreader for a pilot channel coupled to said adaptive matched filter output for despreading said filtered signal using a pseudo-noise signal generated for said pilot channel to produce a despread pilot signal of said pilot channel;
a hard decision processor for determining a symbol value of the despread channel signal of the selected channel in accordance with a modulation constellation;
a complex conjugate processor for generating 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 for producing 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification