Selective call system and a secondary station for use therein

Details Selective call system and a secondary station for use therein Selective call system and a secondary station for use therein

1995-04-27

1998-04-07

Marcelo, Melvin

Multiplex communications

Communication over free space

Signaling for performing battery saving

34082544, 455 383, H04Q 718

Patent

active

057373221

ABSTRACT:
A selective call system comprises at least one base station which transmits address code words at a predetermined data rate. High rate telescript information having a length of more than 500 characters, for example, an E-mail message, is transmitted at a data rate greater than that used for sending address code words. In the event of the system comprising a simulcast system, intersymbol interference (ISI) may occur and in order to reduce the effects of ISI on the decoding the telescript information while avoiding an unnecessarily large drain on a secondary station's batteries, the telescript information as received for a specific secondary station is stored and subsequently equalized in non-real time. The secondary station can comprise a mobile terminal unit and may include a transmitter for transmitting acknowledgement or other response signals, for example, such as spread spectrum signals. The acknowledgement signals may be used for locating the mobile terminal unit.

REFERENCES:
patent: 4882579 (1989-11-01), Siwiak
patent: 4918437 (1990-04-01), Jasinski et al.
patent: 4968966 (1990-11-01), Jasinski et al.
patent: 5128934 (1992-07-01), Jasinski
patent: 5162790 (1992-11-01), Jasinski
patent: 5442750 (1995-08-01), Harriman, Jr. et al.

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