Spreading code generator and CDMA communication system

Details Spreading code generator and CDMA communication system Spreading code generator and CDMA communication system

1996-07-15

1999-07-06

Pham, Chi H.

Pulse or digital communications

Repeaters

Testing

375206, 375295, 370320, H04B 1500, H04K 100, H04L 2730

Patent

active

059205911

ABSTRACT:
A spreading code generator generates a spreading code by modulo-two addition of two internal spreading codes. The first internal spreading code is part of a pseudorandom noise sequence, created by resetting a pseudorandom noise generator to an assigned initial state at intervals determined by counting a framing signal. The second spreading code is selected from a set of preferably orthogonal sequences, the selected sequence being repeated at intervals shorter than the period of the framing signal. A code-division multiple-access communication system employs this spreading code generator to generate all spreading codes used at all communicating stations. One of the spreading codes generated at each station is transmitted as a synchronization signal.

REFERENCES:
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5228056 (1993-07-01), Schilling
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5497395 (1996-03-01), Jou
patent: 5614914 (1997-03-01), Bolgiano et al.
patent: 5663990 (1997-09-01), Bolgiano et al.
G.R. Cooper and R.W. Nettleton, "A Spread-Spectrum Technique for High-Capacity Mobile Communications," IEEE Transactions on Vehicular Technology, vol. VT-27, No. 4, 1978, pp. 264-275.

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