Method of and arrangement for transmitting messages in a digital

Details Method of and arrangement for transmitting messages in a digital Method of and arrangement for transmitting messages in a digital

1985-12-17

1987-09-29

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

455 33, 455 54, 379 59, 370 691, H04J 900, H04J 1300, H04Q 700

Patent

active

046972609

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.

REFERENCES:
patent: 4455662 (1984-06-01), Gutleber
patent: 4472815 (1984-09-01), Gutleber
patent: 4475214 (1984-10-01), Gutleber
patent: 4528656 (1985-07-01), Morais

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