Method and apparatus for increasing the data rate for a given sy

Details Method and apparatus for increasing the data rate for a given sy Method and apparatus for increasing the data rate for a given sy

1989-12-27

1991-11-05

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 380 49, H04L 2730

Patent

active

050635719

ABSTRACT:
A method and apparatus for transmitting a stream of data bits in a spread spectrum format is disclosed. The inventive method comprises providing 2.sup.N predetermined spreading sequences, where N is equal to or larger than 2. The predetermined spreading sequences have suitable autocorrelation and cross-correlation properties. For each group of N bits in a stream of data bits to be transmitted, a particular one from the 2.sup.N predetermined spreading sequences is selected and transmitted. In this manner, each transmitted spreading sequence corresponds to a particular arrangement of N bits. The invention achieves an N-fold increase in data rate for a particular symbol rate by encoding N bits in a spreading sequence.

REFERENCES:
patent: Re32905 (1989-04-01), Baran
patent: 4071903 (1978-01-01), Head et al.
patent: 4203071 (1980-05-01), Bowles et al.
patent: 4392232 (1983-07-01), Andren et al.
patent: 4455651 (1984-06-01), Baran
patent: 4759034 (1988-07-01), Nagazumi
patent: 4817001 (1989-03-01), Lundquist et al.
patent: 4912722 (1990-03-01), Carlin

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