Method for broadcasting of digital data, notably for radio broadcasting at high throughput rate towards mobile receivers, with time frequency interlacing and analog synchronization
Patent 5191576 Issued on March 2, 1993. Estimated Expiration Date: 
October 17, 2011. 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.
October 17, 2011. 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 References 3605019 Frame synchronizing system in a receiver in a time-division multiplex transmission system Method and device for symbol synchronization and their application to the symbol demodulation of digital messages Method of digital sound broadcasting in television channels with spectrum interlacing Multi-channel PCM music broadcasting system Patent #: 4922483 InventorsAssigneeApplicationNo. 777463 filed on 10/17/1991US Classes:370/312, Message addressed to multiple destinations370/208, Particular set of orthogonal functions370/342, Combining or distributing information via code word channels using multiple access techniques (e.g., CDMA)370/349, Using messages having an address field as header370/478, Combined time division and frequency division375/260, Plural channels for transmission of a single pulse train375/285, Antinoise or distortion455/59Single message via plural carrier wave transmissionExaminersPrimary: Safourek, Benedict V.Assistant: Hsu, Alpus H. Foreign Patent References
International ClassesH04J 011/00H04L 027/28 Foreign Application Priority Data1988-11-18 FRAbstractA method for the diffusion of digital data designed to be received notably by mobile receivers moving in an urban environment, that is, in the presence of stray signals and jamming, and in conditions of multiple propagation (Rayleigh process) providing an optimized mode of setting up the frame structure of the broadcast signal, so as to derive the maximum benefit from the resistance of the system to pulsed stray signals and to jamming. The header of each frame has a first empty synchronization symbol and eventually a second, unmodulated wobbled signal forming a two-stage analog synchronization system. So, the recovery of synchronization is achieved in an analog way, without prior extraction of a clock signal at the binary level. The constitution of the sequence of the useful symbols in the frame results from temporal and sequential interlacing operations, combined to obtain an implicit de-interlacing at the receiver. The empty symbol may be further used for the extraction of the jamming affecting the transmission channel.Other References
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