Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2006-03-21
2006-03-21
Burd, Kevin (Department: 2631)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S322000
Reexamination Certificate
active
07016438
ABSTRACT:
A cross polarization interference canceller includes (a) first and second signal receivers which receive signals having been transmitted through first and second polarizations orthogonal with each other, (b) first and second local oscillators each of which converts one of the signals into an IF signal, (c) first and second demodulators each of which demodulates the IF signal for producing a base-band signal and a cross polarization interference cancel reference signal, (d) a phase-difference detector which detects a phase-difference between local signals transmitted from the first and second local oscillators, and transmits a phase-difference signal indicative of the thus detected phase-difference, and (e) first and second phase controllers associated with the first and second demodulators, respectively, and each equalizing phases of the base-band signal and the cross polarization interference cancel reference signal to each other in accordance with the phase-difference signal.
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Burd Kevin
NEC Corporation
Torres Juan Alberto
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