Patent ID: 6411645
Filing Date: 2002-06-25
Classification: H04L

Abstract:
A spread spectrum modulator for use in a multicarrier direct sequence spread spectrum communication system, said spread spectrum modulator comprising:input means for receiving digital data; a pseudo noise code generator for generating a binary pseudo noise code; a spread spectrum signal combiner, having two inputs for receiving said digital data and said binary pseudo noise code and for combining said inputs to generate a baseband digital spread spectrum signal; a waveform shaper, for receiving said spread spectrum signal as an input, and for generating a shaped baseband digital spread spectrum signal; an analog-to-digital converter for receiving said shaped spread spectrum signal, and for converting said shaped digital spread spectrum signal to a shaped analog baseband spread spectrum signal; modulating means for receiving said shaped analog baseband spread spectrum signal, for modulating a plurality of carrier modulators, said modulation means generating a plurality of non-inverted carrier modulated spread spectrum signals; an inverter for converting the polarity of one of said non-inverted carrier modulated spread spectrum signals and for generating an inverted carrier modulated spread spectrum signal; and a combiner for combining the plurality of non-inverted carrier modulated spread spectrum signals and said inverted carrier modulated spread spectrum signal into a combined transmission signal for transmission over a communications channel.