Methods and apparatus for reducing modulation signal...

Details Methods and apparatus for reducing modulation signal... Methods and apparatus for reducing modulation signal...

2008-05-20

2011-12-13

Tran, Khanh C (Department: 2611)

Pulse or digital communications

Bandwidth reduction or expansion

C375S296000

Reexamination Certificate

active

08077770

ABSTRACT:
Methods and apparatus for reducing the bandwidth of modulation signals in a phase path of a polar modulation transmitter. An exemplary method includes generating a phase difference modulation signal for a phase path of a polar modulation transmitter, and filtering the phase difference modulation signal using a linear-phase filter. Filtering the phase difference modulation signal may be performed by first detecting samples in the phase difference modulation signal that have phase difference values in excess of a phase difference threshold and then filtering samples in the vicinity of the threshold-violating samples to remove the threshold-violating events. Alternatively, all samples may be filtered, i.e., without regard as to whether any given sample exceeds a phase difference threshold, to remove large phase difference changes in the phase difference modulation signal, or a combination of linear-phase and nonlinear filters may be used to remove the large phase difference changes.

REFERENCES:
patent: 5329547 (1994-07-01), Ling
patent: 6801086 (2004-10-01), Chandrasekaran
patent: 6834084 (2004-12-01), Hietala
patent: 7054385 (2006-05-01), Booth et al.
patent: 2007/0110184 (2007-05-01), Liang et al.

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