Patent ID: 6320842
Filing Date: 2001-11-20
Classification: H04B,H04J

Abstract:
A spread spectrum communication apparatus comprising:first, second and third differential modulators, arranged for differentially encoding first, second and third data sequences into first, second and third differentially encoded data sequences;a first spread modulator arranged for spreading the first differentially encoded data sequence in accordance with a first spread code;a second spread modulator arranged for spreading the second differentially encoded data sequence in accordance with a second spread code different from the first spread code;a third spread modulator arranged for spreading the third differentially encoded data sequence in accordance with a third spread code different from the first and second spread codes; anda transmitter, arranged for transmitting an output from said first and second spread modulator, and for transmitting an output from said third spread modulator on a first phase of a carrier different from a second phase of the carrier on which an output from said first spread modulator is transmitted.