Four phase to two phase correlator

Details Four phase to two phase correlator Four phase to two phase correlator

1977-06-23

1979-04-10

Griffin, Robert L.

325323, 328165, H04B 116

Patent

active

041491211

ABSTRACT:
A four phase to two phase correlator is incorporated within the demodulator section of a spread spectrum modem to process a received RF signal modulated by a transmitted PN code and a digital data signal. The correlator includes a first modulator for combining the channel 1 and channel 2 R code signals with the received RF input signal to generate a first channel 1 RF signal and a first channel 2 RF signal. The first channel 1 RF signal is modulated by the transmitted PN code signal, the channel 1 R code signal and the digital data signal. The first channel 2 RF signal is modulated by the transmitted PN code signal, the channel 2 R code signal and the digital data signal. A second modulator combines the channel 1 and channel 2 PN code signals and the channel 1 and channel 2 R code signals with a first unmodulated RF signal to generate a second channel 1 RF signal which is modulated by the channel 1 PN code signal and by the channel 1 R code signal, and a second channel 2 RF signal which is modulated by the channel 2 PN code signal by the channel 2 R code signal. A third modulator combines both channels of the first and second RF signals to generate a third RF signal which is modulated only by the digital data signal.

REFERENCES:
patent: 3706933 (1972-12-01), Bidell
patent: 3916313 (1975-10-01), Lowry
patent: 4017798 (1977-04-01), Gordy
patent: 4039749 (1977-08-01), Gordy

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