Multiplex communications – Wide area network – Packet switching
Patent
1986-03-18
1987-08-18
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370100, 455 54, 375107, H04J 1300, H04J 400, H04J 306, H04B 100
Patent
active
046882103
ABSTRACT:
A digital multiplex radio transmission system wherein transmission channels between a fixed radio station and a plurality of mobile radio stations may be established by code division multiplex or frequency division multiplex, individual message channels being separated by means of different distributions of the data symbols transmitted therein. In order to synchronize the fixed station transmitter with the mobile station receivers, respective synchronizing symbols are inserted between the successive data symbols transmitted in any channel. The synchronizing symbols used in all channels are the same, and are spaced at the same time intervals in each channel. Consequently, they are received with significantly higher energy than the data symbols, permitting the multi-path profile to be measured and providing reliable synchronization.
REFERENCES:
patent: 3394224 (1968-07-01), Helm
patent: 3727005 (1973-04-01), Franaszek
patent: 4621355 (1986-11-01), Hirosaki et al.
Eizenhofer Alfons
Grauel Christoph
Briody Thomas A.
Oisher Jack
Olms Douglas W.
Scutch III Frank M.
Streeter William J.
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