Multiplex communications – Communication over free space – Repeater
Patent
1995-06-30
1998-07-14
Marcelo, Melvin
Multiplex communications
Communication over free space
Repeater
370431, 370442, 455 121, 455 541, H04B 7212
Patent
active
057815402
ABSTRACT:
The present invention relates to a device and a method for communicating in a mobile communication system. The method provides a carrier signal having a plurality of frames. Each frame has a plurality of time slots, and each time slot comprises a plurality of transmission bits. A group of time slots are assigned to a communication channel. A traffic burst signal having a plurality of traffic symbols is transmitted over the communication channel by transmitting a first preamble over one of the assigned time slots, and transmitting a second preamble and at least one of the traffic symbols over at least one of the other assigned time slots. The second preamble occupies fewer transmission bits than the first preamble. The apparatus for transmitting a telephony signal over an RF channel includes a modem receiving a digitized PCM telephony signal and producing a traffic burst signal, and a transmitting unit in communication with the modem for transmitting a FDMA/TDMA signal carrying a plurality of traffic burst signals. At least one of the traffic burst signals carries a limited preamble message including a header field and a unique word field and at least one digitized voice message associated with a telephone call. Another traffic burst signal carries at least one signal acquisition message including a unique word field.
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Kelly, R.W., "Use of Low Earth Orbit Satellite Technology in the Development of a Unique Communications and Marine Positioning System," Proceedings of the Ion GPS-93, pp. 199-204, Jun. 1993.
Fraley Daniel
Kim Seok Ho
Malcolm James Eryx
Marquart Robert Carroll
Morris Adrian
Carman Melissa Kay
Denson-Low Wanda
Hughes Electronics
Marcelo Melvin
Whelan John
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