Patent CA1046669A successfully refreshed from Google Patents.
CA1046669A
Expired / Lapsed
CA
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Spread spectrum communication techniques for a code division message multiplexing system
Assignee: Majesty Her Queen In Right Of Canada Represented By Minister Of Defence AS
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Filing: 1975-03-11
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Granted: 1979-01-16
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Expires: 1995-03-11
Abstract
Abstract ABSTRACT OF THE DISCLOSURE A transmission system is described, suitable for transmitting multiple messages over a single carrier. At the transmitter, a message-modulated carrier is given an additional modulation by an identifiable signal. At the receiver, the carrier is identified by means of the additional modulation with messages being retrieved by demodulating the modulated carriers. The system is characterized in that, in the transmitter the carrier for each message is given an additional modulation causing a number of sub-carriers to be generated. The sub-carriers are synchronized in code and carrier frequency both mutually and jointly. The carrier is solely modulated by an identifiable signal. The carrier and sub-carriers are then added to from the transmitted carrier.
Inventors
- 👤 Gunnar R. Stette
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-08 12:35
CPC Classifications
H; H04; H04J; H04J13/00; H04J13/10; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04B7/216; H04K; H04K1/00; H04K1/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A transmission system suited for the transmission of multiple messages over a single carrier, where at a transmitter the message-modulated carrier is given an additional modulation by an identifiable signal, and where at a receiver the carrier is identified by means of the additional modulation, and messages are retrieved by demodulating the modulated carriers, the system being characterized in that in the transmitter the carrier for each message is given an additional modulation in such a way us to generate a number of sub-carriers which are synchronized in code and carrier frequency both mutually and jointly with a carrier solely modulated by an identifiable signal, the latter carrier and the sub-carriers being then added to form the transmitted carrier.
Claim 2
Dependent Claim
119 words
A transmission system suited for the transmission of multiple messages over a single carrier, where at a transmitter the message-modulated carrier is given an additional modulation by an identifiable signal, and where at a receiver the carrier is identified by means of the additional modulation, and messages are retrieved by demodulating the modulated carriers, the system being characterized in that in the transmitter the carrier for each message is given an additional modulation in such a way us to generate a number of sub-carriers which are synchronized in code and carrier frequency both mutually and jointly with a carrier solely modulated by an identifiable signal, the latter carrier and the sub-carriers being then added to form the transmitted carrier.
Claim 3
Dependent Claim
47 words
The transmission system defined in claim 1, further characterized in that in the receiver, derivations of the sub-carriers and of the carrier itself are retrieved from the transmitted carrier by means of the additional modulation, and messages in the derived sub-carriers are retrieved through the carrier itself.
Claim 4
Dependent Claim
26 words
A system as defined in claim 1, wherein the transmitter contains a code generator which produces the identifiable signal and the additional modulations for the transmitter.
Claim 5
Dependent Claim
35 words
A system as defined in claim 1, 2, or 3, wherein the receiver contains a code generator which is synchronized by means of the identifiable signal and which generates the additional modulations for the receiver.
Claim 6
Dependent Claim
36 words
A system as defined in claim 1, wherein the transmitter contains a code generator which produces the identifiable signal and the additional modulations for the transmitter, and the additional modulations are sub-codes of the code generator.
Claim 7
Dependent Claim
42 words
A system as defined in claim 1, wherein the receiver contains a code generator which is synchronized by means of the identifiable signal and which generates the additional modulating for the receiver, and the additional modulations are sub-codes of the code generator.
Claim 8
Dependent Claim
61 words
A system as defined in claim 1, wherein the transmitter contains a code generator which produces the identifiable signal and the additional modulations for the transmitter, and wherein the receiver contains a code generator which is synchronized by means of the identifiable signal and which generates the additional modulations for the receiver, said additional modulations being sub-codes of the code generators.
References Cited (Backward Citations)
No citation records indexed.
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