Apparatus for compensating for phase mismatch in QPSK...

Details Apparatus for compensating for phase mismatch in QPSK... Apparatus for compensating for phase mismatch in QPSK...

2006-01-05

2009-02-17

Bayard, Emmanuel (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S324000

Reexamination Certificate

active

07492838

ABSTRACT:
An apparatus for compensating for a phase mismatch in a Quadrature Phase Shift Keying (QPSK) demodulator that includes a phase mismatch extractor module for generating a signal including a phase mismatch function by mixing an I-channel demodulation signal and a Q-channel demodulation signal, which are output signals of a phase shifter, and extracting the phase mismatch function by filtering the generated signal; and a phase mismatch compensator module for digital-converting the phase mismatch function, mapping the digital-converted phase mismatch function to a first compensation signal, generating a second compensation signal by mixing the digital-converted phase mismatch function with a baseband I-channel signal, generating a third compensation signal by adding a baseband Q-channel signal to the second compensation signal, and mixing the first compensation signal with the third compensation signal.

REFERENCES:
patent: 2006/0109893 (2006-05-01), Chen et al.

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