Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2007-08-28
2007-08-28
Deppe, Betsy L. (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
C375S344000, C329S307000
Reexamination Certificate
active
10646101
ABSTRACT:
A circuit and method for correcting phase of a received phase modulated (PM) signal. The method uses k most recently received data bits, which alternate between in-phase I and quadrature Q bits, as an address for a lookup table60. The lookup table outputs a phase figure62derived from a reconstructed waveform. When the most recent k bit is a Q bit, the complement68of the phase figure62is calculated to yield a phase correction. Otherwise, the phase figure is the phase correction, which is applied to adjust the phase of a delayed version of the received signal. The delayed, phase adjusted signal is then applied to correct the phase of a received signal. The circuit splits an input PM signal in parallel between a matched filter54and a delay block76, 88. The matched filter output provides the input to a register58for storing the k data bits. The delay block holds the PM signal until it is input into a loop phase shifter78synchronously with the phase correction. The output of the loop phase filter is input, after filtering, to a primary phase shifter52that adjusts phase of a received PM signal.
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Haddadin Osama Sami
Kingston Samuel C.
McIntire William K.
Deppe Betsy L.
Harrington & Smith PC
L-3 Communications Corporation
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