Spread spectrum modem
Patent 3934203 Issued on January 20, 1976. Estimated Expiration Date: 
January 20, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 20, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References3706933 InventorApplicationNo. 05/473120 filed on 05/24/1974US Classes:375/343Correlative or matched filterExaminersPrimary: Libman, George H.Attorney, Agent or FirmInternational ClassesH04B 1/69 (20060101)H04J 13/00 (20060101) AbstractDigital data having a rate R and to be transmitted is converted into a K- code, T-seconds long and delayed according to a particular N-bit word, where N=RT, whereby the code carries information in its delayed position in the T frame and not in the code itself. At a receiver station, the correlation function of the received signal is produced and the envelope detected, after which the samples are taken at each of the K possible output times. The largest output selected comprises the information on the delay of the transmitted signal. | |
