GMSK/EDGE modulator with switching transition smoothing

Details GMSK/EDGE modulator with switching transition smoothing GMSK/EDGE modulator with switching transition smoothing

2006-12-22

2010-10-05

Vo, Don N (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

Reexamination Certificate

active

07809082

ABSTRACT:
To minimize abrupt changes in modulated signal amplitude when switching between modulation types in a multi-modulation system, a “smoothing” circuit is used. When the modulation type is changed in a multi-slot modulation, the last symbol of the previous slot is overwritten and modulation is controlled by a smoothing circuit during the time of the final symbol of the previous slot to effect the trajectory smoothing. The IQ-plane is divided into two (or more) zones, each with an associated safe point. After the next-to-last symbol is modulated, modulation is made to jump to the safe point associated with the zone and modulation continues to a starting point. From the starting point, the next slot can be modulated using the new modulation type.

REFERENCES:
patent: 2005/0215206 (2005-09-01), Granstrom et al.
patent: 2005/0281353 (2005-12-01), Huang et al.
patent: 2005/0286653 (2005-12-01), Lai et al.
patent: 2008/0310543 (2008-12-01), Helfenstein et al.

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