Ultrafast time hopping CDMA and TDMA RF and optical communicatio

Details Ultrafast time hopping CDMA and TDMA RF and optical communicatio Ultrafast time hopping CDMA and TDMA RF and optical communicatio

1997-03-07

2000-12-12

Pham, Chi H.

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

375203, H04B 7216

Patent

active

061608025

ABSTRACT:
Ultrashort pulse time hopping code-division-multiple-access (CDMA) and time-division-multiple-access (TDMA) RF IR and optical communications systems in the time-frequency domain comprises a transmitter including a short duration pulse/packet generator for generating a short duration pulse/packet in the femtosecond to microsecond range and a controller for controlling the generator, code means connected to the controller for varying the time position of each short pulse/packet in frames of pulses/packets in orthogonal superframes of ultrafast time hopping code and time division multiple access format, precise oscillator-clock for controlling such timing, encoding modems for transforming intelligence into pulse/packet position modulation form, antenna/amplifier system. Preferably, the codes are orthogonal codes with the temporal coding of the sequence of ultrafast pulses/packets constituting the carrier for transmission by the antenna system.

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