Pulse or digital communications – Repeaters – Testing
Patent
1978-07-18
1981-09-22
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
455 12, 455 17, 375 44, 375100, H04B 1500, H04K 104
Patent
active
042914094
ABSTRACT:
A method and apparatus employing spread spectrum techniques in a wide bandwidth communications system is disclosed. A plurality of transmitting stations are each equipped to provide a transmission signal representing a pseudo-random coded, phase modulated, message signal. The transmission signal is directed through a bandwidth which encompasses otherwise dedicated, relatively narrow bandwidth repeater channels, employed in connection with a communications satellite, to a generally fixed receiver station. At the receiving station, the incoming signal is (a) code acquired and tracked, (b) carrier acquired and tracked, (c) phase locked to the receiver local oscillator and (d) coherently demodulated to extract the desired data. The receiving station advantageously employs plural receiving elements each having a pseudo-random sequence code matched filter which significantly reduces code acquisition time by obviating the necessity of exhaustively correlating the incoming signal with a replica of the pseudo-random code word at the receiver station.
REFERENCES:
patent: 3158864 (1964-11-01), Lehan
patent: 3305636 (1967-02-01), Webb
patent: 3350644 (1967-10-01), McNair
patent: 3351859 (1967-11-01), Groth, Jr. et al.
patent: 3432619 (1969-03-01), Blasbalg
patent: 3478268 (1969-11-01), Coviello
patent: 3610828 (1971-10-01), Girard
patent: 3665472 (1972-05-01), Kartchner et al.
patent: 3669447 (1972-10-01), Frost
patent: 3706933 (1972-12-01), Bidell
patent: 3714573 (1973-01-01), Grossman
patent: 3766477 (1973-10-01), Cook
patent: 3806815 (1974-04-01), Fletcher
patent: 3864635 (1975-02-01), Ewanus
patent: 3934203 (1976-01-01), Schiff
patent: 4017798 (1977-04-01), Gordy et al.
patent: 4039749 (1977-08-01), Gordy et al.
patent: 4041391 (1977-08-01), Deerkoski
patent: 4112372 (1978-09-01), Holmes et al.
"Modulation Techniques for Multiple Access to a Hard Limiting Satellite Repeater", Aein et al., IEEE Proc., vol. 54, No. 5, pp. 763-777 (May, 1966).
Weinberg et al., "IEE Journal of Oceanic Engineering", vol. OE-2 #3, Jul. 1977, pp. 274-285.
Ebert Paul M.
Fee Joseph J.
Kaminsky Yaroslav
Keblawi Feisal S.
Scales Walter C.
Safourek Benedict V.
The Mitre Corporation
LandOfFree
Spread spectrum communications method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spread spectrum communications method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spread spectrum communications method and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-339065