Process for the recovery of data transmitted over a transmission path for digital data streams using decoding by cross-correlation of a data sequence coded by cyclic shifting and inversion
Patent 5504781 Issued on April 2, 1996. Estimated Expiration Date: 
August 1, 2014. 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.
August 1, 2014. 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 ReferencesCode conversion apparatus Phase ambiguity resolution for offset QPSK modulation systems Patent #: 5025455 InventorAssigneeApplicationNo. 284402 filed on 08/01/1994US Classes:375/242, PULSE CODE MODULATION341/173, CODE GENERATOR OR TRANSMITTER342/189, For correlation375/241, Pulse code modulation714/801Parity generator or checker circuit detailExaminersPrimary: Tse, Young T.Assistant: Luther, William Attorney, Agent or FirmInternational ClassesH04B 014/04H04B 015/00 H04L 027/00 Foreign Application Priority Data1992-01-31 DEAbstractA process for recovering, at the reception end, data transmitted over a transmission path for digital data streams. A code-word generator for generating a binary code word producing a Dirac pulse is provided. The binary code word is cyclically shifted to create further binary code words. The binary code word and further binary code words are inverted to create still further binary code words. The data is coded, on the transmission end of the transmission path, with the binary code word, with the further binary code words, and with the still further binary code words. On the reception end of the transmission path, the data is recovered by cross-correlating the data and by utilizing the position of the main maximum of the cross-correlation functions. To increase the number of code words, a second code-word generator and a third codeword generator, having different generator polynomials, are used for coding binary code words, further binary code words, and still further binary code words, by cyclical shifting and inversion in a manner similar to that above. On the reception end of the transmission path, second and third cross-correlators are additionally used. The main maximum of each of the resulting three cross-correlation functions is detected and the data word transmitted is recovered based on a main maximum with a value above a predetermined value and from the position of this main maximum.Other References
Field of SearchCorrelative or matched filterAntinoise or distortion MISCELLANEOUS TRANSMITTERS SYSTEMS USING ALTERNATING OR PULSATING CURRENT RECEIVERS Particular pulse demodulator or detector Antinoise or distortion Pulse code modulation PULSE CODE MODULATION BODILY ACTUATED CODE GENERATOR CODE GENERATOR OR TRANSMITTER | |
