Use of chip repetition to produce a flexible bandwidth...

Details Use of chip repetition to produce a flexible bandwidth... Use of chip repetition to produce a flexible bandwidth...

2006-09-05

2006-09-05

Sam, Phirin (Department: 2661)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S208000, C370S342000, C370S320000, C375S130000, C375S134000, C375S136000, C375S145000, C375S149000

Reexamination Certificate

active

07103026

ABSTRACT:
A method is disclosed for obtaining a spreading code set for a code division multiple access (CDMA) communications system. The method includes (a) generating a P′×P′ spreading code set where P′=P/N, where P is the spreading gain in chips/symbol and where N is an integer multiple of 2; and (b) replicating chips in each spreading code by N to produce a P′×P spreading code set. The step of generating may include randomizing the spreading code set by performing at least one or row or column permutation. The P′×P spreading code set is subsequently loaded into system hardware for operating the system hardware with a bandwidth that is less than the bandwidth that would be required to operate with the P′×P′ Hadamard spreading code set. The CDMA system may be a synchronous, direct sequence code division multiple access communications system.

REFERENCES:
patent: 5204876 (1993-04-01), Bruckert et al.
patent: WO 98/45960 (1998-10-01), None

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