Patent ID: 6968016
Filing Date: 2005-11-22
Classification: H04L

Abstract:
1. A device for modulating a carrier signal comprising: (a) a mapper generating a first data signal at a selected one of a plurality of baud rates, the first data signal comprises an I-channel first data signal and a Q-channel first data signal; (b) a scaler multiplying the first data signal by one of a plurality of predetermined scaler values selected to correspond to the baud rate to generate a scaled data signal, the scaled data signal comprises an I-channel scaled data signal and a Q-channel scaled data signal and wherein the complex mixer includes: (c) a complex mixer for generating a frequency shifting scaled data signal, the frequency shifted scaled data signal comprises an I-channel frequency shifted scaled data signal and a Q-channel frequency shifted scaled data signal; (d) an upsampler circuit for increasing the sampling frequency of the frequency shifted scaled data signal; and (e) a pulse shaper circuit for generating a digital representation of a modulated carrier signal in accordance with the frequency shifted scaled data signal, wherein the pulse shaper circuit includes a finite impulse response filter and a coefficient matrix storing a set of coefficients for each of the I-channel and the Q-channel.