The Aerospace Corporation

Srinivasa H Raghavan

Jack K Holmes

Kristine P Maine

Kris P Maine

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 staggered 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.

Code division multiple access enhanced capacity system

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.

An NRZ and biphase-L formatted, quadriphase modulated GPS signal transmission communication method provides for the simultaneous modulation of two CDMA spread spectrum codes such as the GPS C/A code and either the P(Y) code, or an arbitrary NEW code modulating a single carrier for GPS use in one or both L1 and L2 bands. The use of NRZ formatting and biphase-L formatting provides spectral separation even though both spread spectrum signals are modulated onto the same carrier.

NRZ and biphase-L formatted quadriphase modulated GPS transmission method

An NRZ and biphase-L formatted, three code hexaphase modulated GPS signal transmission communication method provides for the simultaneous modulation of the C/A code, the P(Y) code and a NEW code all modulating a single carrier for GPS use in one or both L1 and L2 bands. The use of the C/A code and the P(Y) code which are NRZ formatted with a NEW code biphase-L formatted and using hexaphase modulation on the three signals provides for spectral separation between the C/A code signal and the NEW code signal, all three modulated on a single carrier frequency.

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Rancho Palos Verdes, CA, United States of America

Srinivasa H Raghavan