Method and apparatus for generating diffusion code

Details Method and apparatus for generating diffusion code Method and apparatus for generating diffusion code

1994-08-10

1995-08-01

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 380 46, 331 78, 364717, H04B 169, G06F 102

Patent

active

054385962

ABSTRACT:
A method and apparatus for generating the PN code employed for spread spectrum communication are disclosed. Maximal period sequence signals from a maximal period sequence generator 11 and shift vector from a shift vector outputting circuit 10 are transmitted to a vector multiplier 12 for vector multiplication. Outputs of the vector multiplier 12 are transmitted directly to a selector 14 and via a one-chip delay flipflop 13 to the selector 14. The selector 14 is changed over at an externally set control timing. The PN code employed in a CDMA system Cellular may be arbitrarily time-shifted using the vector multiplication so that changeover between transmitting base stations desired to be received may be achieved in a shorter time using a simplified circuit construction.

REFERENCES:
patent: 4685132 (1987-08-01), Bishop et al.
patent: 4785410 (1988-11-01), Hamatsu et al.
patent: 4847861 (1989-07-01), Hamatsu et al.
patent: 4928310 (1990-05-01), Goutzoulis et al.
patent: 4959832 (1990-09-01), Bardell, Jr.
patent: 5031130 (1991-07-01), Harada
patent: 5111416 (1992-05-01), Harada

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