Communication through a channel having a variable propagation de

Details Communication through a channel having a variable propagation de Communication through a channel having a variable propagation de

1993-12-27

1995-08-08

Olms, Douglas W.

Electrical transmission or interconnection systems

Wave form or wave shape determinative or pulse-producing...

With capacitor

370 951, H04J 306

Patent

active

054405629

ABSTRACT:
A communication system (10) communicates real time data through a channel (26) that imposes delays of variable duration on signals propagating therethrough. The channel (26) may be established between a fastmoving satellite (14) in an orbit (28) around the earth and a subscriber unit (24) located proximate the earth' surface. The real time data are generated synchronously (124) at the subscriber unit (24) with a TDM frame (40) established by the satellite (14). The data are delayed in a variable delay circuit (68) before transmission through the channel (26). The duration of the delay imposed by the delay circuit (68) varies in response to timing data received from the satellite (14). The timing data describe a changing propagation delay for the channel (26) and changing definitions for TDM time slots (42', 44') Data received at the subscriber unit (24) are delayed in another variable delay circuit (76). Both gradual and abrupt timing characteristics of the channel (26) are absorbed by the variable timing circuits (68, 76).

REFERENCES:
patent: 4346470 (1982-08-01), Alverez, III et al.
patent: 4607257 (1986-08-01), Noguchi
patent: 4769815 (1988-09-01), Hinch et al.
patent: 4903257 (1990-02-01), Takeda et al.
patent: 5249174 (1993-09-01), Itoh
patent: 5276714 (1994-01-01), Hosi et al.
patent: 5339186 (1994-08-01), Weverka
An article entitled "IRIDIUM System Overview" from Modern Science & Tecnology of Telecommunications, Nov. 1991, by Theresa Wang and Ellen Pickethall.

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