Patent ID: 6324209
Filing Date: 2001-11-27
Classification: H04B,H04J

Abstract:
A multi-channel spread-spectrum modulator subsystem, comprising:a demultiplexer for demultiplexing a representation of an input data stream into a plurality of sub-channel data-sequence signals;a plurality of mapping circuits, one of which is coupled to receive each respective sub-channel data-sequence signal from the demultiplexer, wherein each mapping circuit is for mapping predetermined-length segments of the respective sub-channel data-sequence signal to generate a respective phase modulated spread-spectrum sub-channel signal,each phase modulated spread-spectrum sub-channel signal comprising orthogonal spreading-codes selected in response to mapping of first predetermined bits of the segments of the respective sub-channel data-sequence signal, the selected orthogonal spreading-codes being modulated with phasors selected in response to mapping of second predetermined bits of the segments of the respective sub-channel data-sequence signal; anda signal combiner for receiving the respective spread-spectrum sub-channel signals from the mapping circuits for transmission.