WIRELESS TRANSMIT/RECEIVE UNIT (WTRU) FOR CARRIER OFFSET RECOVERY
First Claim
1. A wireless transmit/receive unit (WTRU) for carrier-offset recovery during reception of a communication signal over an air interface using a reduced pilot signal, the WTRU comprising:
- a receiver for receiving at least one of a plurality of digital spread spectrum channels in a wireless communication, the receiver comprising;
a hard decision processor in association with a complex conjugate processor configured to receive at least one despread channel signal of a selected channel and to produce a phase correction signal;
a multiple input phase-locked loop (PLL) configured to utilize a plurality of pseudo pilot signals for producing a carrier phase correction signal used for performing the carrier offset correction at a chip level or at a symbol level;
a mixer configured to mix the phase correction signal with a filter weighting signal to remove a relative phase error from the filter weighting signal and to produce a weighting signal; and
an adaptive matched filter configured to receive the communication signal and to produce a filtered signal by using the weighting signal produced from the phase correction signal.
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Accused Products
Abstract
A wireless transmit/receive unit (WTRU) 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
10 Claims
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1. A wireless transmit/receive unit (WTRU) for carrier-offset recovery during reception of a communication signal over an air interface using a reduced pilot signal, the WTRU comprising:
a receiver for receiving at least one of a plurality of digital spread spectrum channels in a wireless communication, the receiver comprising; a hard decision processor in association with a complex conjugate processor configured to receive at least one despread channel signal of a selected channel and to produce a phase correction signal; a multiple input phase-locked loop (PLL) configured to utilize a plurality of pseudo pilot signals for producing a carrier phase correction signal used for performing the carrier offset correction at a chip level or at a symbol level; a mixer configured to mix the phase correction signal with a filter weighting signal to remove a relative phase error from the filter weighting signal and to produce a weighting signal; and an adaptive matched filter configured to receive the communication signal and to produce a filtered signal by using the weighting signal produced from the phase correction signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method for a wireless transmit/receive unit (WTRU) for carrier-offset recovery during reception of a communication signal over an air interface using a reduced pilot signal, the method comprising:
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receiving at least one of a plurality of digital spread spectrum channels in a wireless communication receiving, by a hard decision processor in association with a complex conjugate processor, at least one despread channel signal of a selected channel and to produce a phase correction signal; utilizing, by a multiple input phase-locked loop (PLL), a plurality of pseudo pilot signals for producing a carrier phase correction signal used for performing the carrier offset correction at a chip level or at a symbol level; mixing, by a mixer, the phase correction signal with a filter weighting signal to remove a relative phase error from the filter weighting signal and to produce a weighting signal; and receiving, by an adaptive matched filter, the communication signal and producing a filtered signal by using the weighting signal produced from the phase correction signal. - View Dependent Claims (7, 8, 9, 10)
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Specification