Method of and arrangement for transmitting messages in a digital radio transmission system
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United States of America Patent
Stats
-
Sep 29, 1987
Grant Date -
N/A
app pub date -
Dec 17, 1985
filing date -
Dec 22, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for use in a digital radio transmission system comprising stationary radio stations arranged in a cellular network and to which are assigned a plurality of mobile radio stations. Transmission of digital messages from a stationary radio station to the mobile radio stations assigned to it is effected by wide-band code division multiplex modulation, and transmission of digital messages from such mobile radio stations to the stationary radio station is effected by narrow-band frequency multiplex modulation. This reduces bandwidth requirements and improves the signal-to-noise ratio for each direction of transmission.
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