Method for broadcasting of digital data, notably for radio broad

Details Method for broadcasting of digital data, notably for radio broad Method for broadcasting of digital data, notably for radio broad

1991-10-17

1993-03-02

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370 21, 370 50, 370 691, 370 70, 375 38, 375 58, 455 59, H04J 1100, H04L 2728

Patent

active

051915766

ABSTRACT:
A 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.

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