Spread spectrum demodulator

Details Spread spectrum demodulator Spread spectrum demodulator

1975-09-08

1977-08-02

Safourek, Benedict V.

Telegraphy

Systems

Line-clearing and circuit maintenance

325320, 325473, H04L 2722

Patent

active

040397491

ABSTRACT:
The present invention is directed to a demodulator for demodulating a wideband spread spectrum four-phase PSK (phase shift keyed) modulated carrier signal wherein the phase modulation was in response to an encoded data signal and wherein the encoding of the data signal and spreading of the spectrum was accomplished by the mixing of the data signal with a pseudo-random pulse sequence (PN-sequence).
The demodulator is comprised in part of a generator means for providing a pseudo-random pulse sequence corresponding to the sequence used to encode the data signal; and an encoding means for converting the provided PN-sequence into a four-phase PN sequence. A correlation means correlates the generated four-phase PN sequence against the received four-phase PSK modulated carrier signal to provide a two-phase collapsed spectrum signal. A switching means interposed between correlation means and the generator means switches two of the four phases of the four phase PN-sequence signal applied to the correlation means until proper phasing is achieved.

REFERENCES:
patent: 3350644 (1967-10-01), McNair
patent: 3478268 (1969-11-01), Coviello
patent: 3916313 (1975-10-01), Lowry

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