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Synchronous spread-spectrum communications system and method    
United States Patent5228056   
Link to this pagehttp://www.wikipatents.com/5228056.html
Inventor(s)Schilling; Donald L. (Sands Point, NY)
AbstractA spread spectrum communications system for use over a communications channel, including a transmitter-generic-chip-code generator, a transmitter-message-chip-code generator, an EXCLUSIVE-OR gate, a combiner, a transmitter, a receiver-generic-chip-code generator, a receiver-generic mixer, a generic-bandpass filter, a receiver-message-chip-code generator, a receiver-message mixer, a message-bandpass filter, and a synchronous detector. The transmitter-generic-chip-code generator generates a generic-chip-code signal and the transmitter-message-chip-code generator generates a message-chip-code signal. The EXCLUSIVE-OR gate spread-spectrum processes message data with the message-chip-code signal to generate a spread-spectrum signal. The combiner combines the generic-chip-code signal with the spread-spectrum-processed signal. The transmitter transmits the combined generic-chip-code signal and spread-spectrum signal, on a carrier signal over the communications channel as a spread-spectrum-communications signal. The receiver-generic-chip-code generator generates a replica of the generic-chip-code signal. The generic mixer recovers the carrier signal from the spread-spectrum-communications signal. The receiver-message-chip-code generator generates a replica of the message-chip-code signal. The receiver-message mixer despreads the spread-spectrum-communications signal as a modulated-data signal. The tracking and acquisition circuit uses the recovered carrier signal for synchronizing the replicas of the generic-chip-code signal to the recovered carrier signal. The synchronous detector synchronously demodulates the modulated-data signal as received data.
   














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Drawing from US Patent 5228056
Synchronous spread-spectrum communications system and method - US Patent 5228056 Drawing
Synchronous spread-spectrum communications system and method
Inventor     Schilling; Donald L. (Sands Point, NY)
Owner/Assignee     InterDigital Technology Corporation (Wilmington, DE)
Patent assignment
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Publication Date     * July 13, 1993
Application Number     07/626,109
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     December 14, 1990
US Classification     375/144 375/145 380/34
Int'l Classification     H04K 001/00
Examiner     Swann; Tod
Assistant Examiner    
Attorney/Law Firm     David Newman & Associates
Address
Parent Case    
Priority Data    
USPTO Field of Search     375/1 375/38 375/48 375/66 375/89 455/59 455/103 455/209 455/216 455/303 380/33 380/34 380/40
Patent Tags     synchronous spread-spectrum communications
   
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Schilling
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