Multiplex communications – Wide area network – Packet switching
Patent
1992-10-19
1995-10-03
Kizou, Hassan
Multiplex communications
Wide area network
Packet switching
370 73, 370 84, 370 951, 3701101, 455 32, 455 121, 455 311, 455 541, 4551541, 34082503, H04J 400, H04B 714
Patent
active
054558239
ABSTRACT:
An integrated communications terminal including a selectable channel demodulator and decoder, a time-division-multiplexed (TDM) channel demodulator and decoder, a data processor and controller, an audio decompressor, a D/A converter, and a data coder and modulator. The terminal is used with a mobile station having a message display, an input device, RF electronics, and an optional transmitter. The selectable channel demodulator outputs a selectable intermediate-frequency signal as in-phase and quadrature-phase signals for decoding by the selectable channel decoder. The TDM channel demodulator generates a frequency offset signal and outputs in-phase and quadrature-phase TDM signals for decoding by the TDM channel decoder as a TDM-data signal. The data processor and controller time-demultiplexes the TDM-data signal as a control signal, a TDM channel and selectable channel look-up table, and paging and message signals, and generates a transmitter frequency command signal, a selectable data rate and frequency command signal, and a TDM data rate and frequency command signal. The audio decompressor outputs a digital audio data signal. The D/A converter outputs analog audio signals. The carrier signal frequency of the transmitter is set by the transmitter frequency command signal generated by the data processor and controller. The data coder and modulator encodes a data signal and then modulates a carrier signal with the coded data signal to create a data-modulated signal. The transmitter amplifies and transmits the data-modulated signal.
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Noreen Gary
Renshaw Ken
Kizou Hassan
Radio Satellite Corporation
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