Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2007-11-01
2011-10-11
Torres, Juan A (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
C375S261000, C375S268000, C375S279000, C375S308000, C329S304000, C455S205000
Reexamination Certificate
active
08036319
ABSTRACT:
A direct conversion receiver and a method for correcting phase imbalance including applying an input signal to an in-phase channel and a quadrature channel of the receiver. The input signal is processed by the receiver to obtain an in-phase zero intermediate frequency (IF) signal in the in-phase channel and a quadrature zero-IF signal in the quadrature channel. The in-phase zero-IF signal and the quadrature zero-IF signal are filtered to obtain a fixed band signal. A phase imbalance correction value is obtained for the fixed-band quadrature zero-IF signal as a function of the frequency of the fixed-band in-phase zero-IF signal and the fixed-band quadrature zero-IF signal. The in-phase zero-IF signal and the quadrature zero-IF signal are sampled and the phase imbalance correction value is applied using an interpolation to the sampled quadrature zero-IF signal or to the sampled in-phase zero-IF signal to correct the phase imbalance in the direct conversion receiver.
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Arambepola Bernard
Cowley Nick
Grossman Tucker Perreault & Pfleger PLLC
Intel Corporation
Torres Juan A
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