Patent ID: 7680210
Filing Date: 2010-03-16
Classification: H04L

Abstract:
1. A modulator for generating a digital in-phase/quadrature (I/Q) signal having a plurality of time-slots, the modulator comprising; a first branch of 0 at least one second branch of higher order with a second pulse-shaping filter for providing a second linearly modulated signal in the I/Q domain; an adder for adding the first linearly modulated signal and the second linearly modulated signal to approximate a Gaussian Minimum Shift Keying (GMSK) modulator; and means for introducing a dip in an envelope of the digital I/Q signal in a guard interval between adjacent time-slots of the plurality of time-slots, the means for introducing the dip in the envelope of the digital I/Q signal in the guard interval between the adjacent time-slots of the plurality of time-slots including means for filling digital zeros into the first pulse-shaping filter and the second pulse-shaping filter.