H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/17
H04J 3/06 (2006.01) H04J 13/00 (2006.01) H04J 13/02 (2006.01) H04Q 7/30 (2006.01)
Patent
CA 1251875
19 ABSTRACT: In digital multiplex transmission systems, more specifically in a digital radio transmission system, a plurality of message transmission channels are operated in time-division, code-division or frequency-division multiplex. When using the code-division multiplex or frequency-division multiplex method, separating the indi- vidual message transmission channels is erected with the aid of different sets of data symbols. The messages trans- mitted through the individual message transmission channels of the multiplex transmission systems more specifically the symbols (data and synchronising symbols) are trans- mitted time-synchronously with each other. At the beginning of each frame and sub-frame (in a time division multiplex transmission system) the synchronising information is transmitted at the beginning of a frame and the length of the message is equal to the period of time between two synchronising symbols. Particularly in a digital radio transmission system, because of the multi-path propagation, a fail-safe synchronisation of the receiver arrangements is a prerequisite for evaluating the message content in the mobile radio station. So as to enable accurate syn- chronisation of the receiver arrangements in wide-band transmission, synchronising symbols are inserted at defined intervals between the data symbols which symbols are transmitted simultaneously in several message transmission channels and are equal to each other. Consequently, the synchronising symbols are received with a significantly higher energy than the data symbols, the multi-path profile can be measured and a sure synchronisation can be rendered possible.
505481
Eizenhofer Alfons
Gravel Christoph
Kirby Eades Gale Baker
N.v.philips'gloeilampenfabrieken
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