Patent ID: 7729441
Filing Date: 2010-06-01
Classification: H04L

Abstract:
1. A method for generating a modulated carrier signal based on a plurality of data symbols, the method comprising: receiving a plurality of data symbols; generating a digital input signal based on the plurality of data symbols; filtering the digital input signal to produce a digital output signal including a phase characteristic, wherein the phase characteristic of the digital output signal remains within about ten degrees of a desired symbol phase for a duration that exceeds 50 percent of a symbol period corresponding to a symbol transmission rate; and modulating a carrier signal using the digital output signal to produce the modulated carrier signal, wherein the filtering is accomplished using a pulse-shaping filter that has a time domain impulse response having a peak and at least first and second zero crossings on either side of the peak, wherein said second zero crossing is offset from the peak of the time domain impulse response by about one symbol period.