Digital modulator for a GSM/GPRS/EDGE wireless polar RF...

Details Digital modulator for a GSM/GPRS/EDGE wireless polar RF... Digital modulator for a GSM/GPRS/EDGE wireless polar RF...

2009-02-24

2010-12-28

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

C375S302000, C375S309000, C375S322000, C375S342000, C375S350000, C455S102000, C455S108000

Reexamination Certificate

active

07860188

ABSTRACT:
A digital modulator in a radio transmitter includes circuitry for switching between Gaussian Minimum Shift Keying (GMSK) and Phase-Shift Keying (PSK) while maintaining spectral mask requirements. The digital modulator of the present invention includes both GMSK and PSK symbol mappers that produce PSK in-phase and quadrature symbols and GMSK symbols, respectively, to a pulse shaping block. Based on opposite phases of a modulation control signal, the symbol mappers produce either modulated data or a steam of logic zeros to the pulse shaping block. The pulse shaping block filters the received data and multiplexes the data so that each modulated data stream receives non-zero data during a guard time to avoid abrupt changes in the modulated signal that would violate the spectral mask requirements.

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