Information communication system using multi-code CDMA mode

Details Information communication system using multi-code CDMA mode Information communication system using multi-code CDMA mode

1995-11-30

1998-07-14

Safourek, Benedict V.

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

370536, 375200, 375286, H04B 7216

Patent

active

057815429

ABSTRACT:
A system adaptively determines the number of spread codes to use and a type of multi-valued modulation system based on the station of the system. Transmission information is divided into a number of sequences equal to the number of used spread codes. These sequences are error correction encoded, primarily modulated according to a selected one of a plurality of types of multi-valued modulation schemes, secondarily modulated by the selected spread codes, and transmitted.

REFERENCES:
patent: 5539770 (1996-07-01), Ishigaki
patent: 5592469 (1997-01-01), Szabo
patent: 5612948 (1997-03-01), Fette et al.
Gottfried Ungerboeck, "Trellis-Coded Modulation With Redundant Signal Sets Part I: Introduction", IEEE Communications Magazine, vol. 25, No. 2, Feb. 1987, pp. 5-11.
Gottfried Ungerboeck, "Trellis-Coded Modulation With Redundant Signal Sets Part II: State of the Art", IEEE Communications Magazine, vol. 25, No. 2, Feb. 1987, pp. 12-21.

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