Code division multiple access enhanced capacity system

Details Code division multiple access enhanced capacity system Code division multiple access enhanced capacity system

2006-11-21

2006-11-21

Phu, Phuong (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S146000, C375S147000, C375S142000, C375S150000, C370S320000, C370S335000, C370S342000

Reexamination Certificate

active

07139302

ABSTRACT:
A code division multiple access (CDMA) communication system using spread spectrum signaling over a communication bandwidth uses two different signal spectra generated using two different respective spreading code formats, such as NRZ code formatting and Manchester code formatting, for respectively providing nonsplit spectra having a center peak and split spectra having a center null. The spectra are combined during transmission as a CDMA communication signal having a composite spectrum. The use of different code formats produces the composite spectrum of respective center peak and center null spectra that enables increased channel capacity.

REFERENCES:
patent: 6075810 (2000-06-01), Raghavan et al.
patent: 6148022 (2000-11-01), Raghavan et al.
patent: 2004/0161019 (2004-08-01), Raghavan et al.

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