Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Patent
1994-07-29
1997-03-11
Olms, Douglas W.
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
375203, 375207, H04J 1300
Patent
active
056109075
ABSTRACT:
An ultrashort pulse time hopping code-division-multiple-access (CDMA) RF communications system in the time-frequency domain comprises a transmitter including a short duration pulse generator for generating a short duration pulse in the picosecond to nanosecond range and a controller for controlling the generator, code means connected to the controller for varying the time position of each short pulse in frames of pulses in orthogonal superframes of ultrafast time hopping code division multiple access format, precise oscillator-clock for controlling such timing, encoding modems for transforming intelligence into pulse position modulation form, antenna/amplifier system. A homodyne receiver is provided for receiving and decoding the coded broadcast signal, and one or more utilization devices are connected to the homodyne receiver. Preferably, the codes are orthogonal codes with the temporal coding of the sequence of ultrafast, ultrawideband pulses constituting the carrier for transmission by the antenna system. The homodyne receiver includes a bank of decoder/modems, an acquisition system/matched filter for synchronizing to a superframe transmission, identifying coded sequencers in the superframe and assigning the transmissions to a selected decoder/modem on the basis of code recognition. The system is adapted for multichannel operation and provides a high overall data rate in the 500 mbs range for maximum multichannel operation.
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Olms Douglas W.
Ton Dang
Zegeer, Esq. Jim
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