초록 ▼

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

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.

대표청구항 ▼

An ultrashort pulse time hopping code-division-multiple-access (CDMA) RF communications system in the time frequency domain, comprising: transmitter means, said transmitter means including: a) means for generating a short duration pulse in the picosecond to nano-second range and means for controllin

An ultrashort pulse time hopping code-division-multiple-access (CDMA) RF communications system in the time frequency domain, comprising: transmitter means, said transmitter means including: a) means for generating a short duration pulse in the picosecond to nano-second range and means for controlling said means for generating, b) coding means connected to said means for controlling for varying the time position of each said short duration pulse in frames of pulses in orthogonal superframes of ultrafast time hopping code division multiple access format, c) precise oscillator-clock means for controlling such timing, d) encoding modems for transforming information, voice and data signals into pulse position modulation form, e) antenna means connected to said means for generating for receiving and broadcasting said short duration pulse as a coded broadcast signal, receiver means, said receiver means including: a) antenna means for receiving said coded broadcast signal, and b) homodyne receiver means for receiving and decoding said coded broadcast signal.