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5574748 |
Spread spectrum communications system for network
Spread spectrum chirps (i.e., wideband frequency packets) are propagated on a local area network in a hostile communications environment, such as a powerline or a crowded radio frequency band....
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5440636 |
Apparatus and method for processing of frequency hopping communications
The present invention relates to signal processors and processing, and more particularly to apparatus and method for sensing, detection and/or demodulation of frequency hopping signals.
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5263046 |
Spread-spectrum chirp communication with sharply defined bandwidth
Communication apparatus and method that includes generating a series of successive spread-spectrum chirp signals, which are progressively swept within a defined bandwidth. The chirps are divided...
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4468792 |
Method and apparatus for data transmission using chirped frequency-shift-keying modulation
A method for transmission of digital data utilizes a carrier frequency offset in a first frequency direction for a first binary condition, and offset in a second frequency direction for the...
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4438519 |
Methods, and apparatus, for transmitting high-bit-rate digital data in power line communication media having high harmonic noise content
In a power line data communications system, high-bit-rate digital data is transmitted through a communications media, having high harmonic noise content, by use of a frequency-modulated chirp...
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4382232 |
Device for demodulating signals modulated by frequency-shift keying
A device for demodulating signals modulated by frequency-shift keying comprises a surface-wave filter having two input transducers supplied in parallel by the modulated signals and separated by a...
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EP0007276A1 |
Demodulation device for frequency shift keyed signals.
Abstract not available for EP0007276 Abstract of corresponding document: US4382232 A device for demodulating signals modulated by frequency-shift keying comprises a surface-wave filter having two...
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3890472 |
Transparent time-division pulse-multiplex digital electric signal switching circuit arrangement
Bilevel or bistatic digital electric signals are transmitted directly through a time division multiplexing (TDM) switching component asynchronously of the TDM clocking pulse train. A pulse duration...
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3808537 |
RADIOTELEPHONE SYSTEM WITH CENTRAL OFFICE HAVING INDIVIDUAL PROCESSORS ASSIGNABLE TO RESPECTIVE MOBILE UNITS ABOARD COMMUNICATING VEHICLES
A central office, designed for short-wave radiocommunication with mobile units aboard several vehicles in its area, has a plurality of fixed processing units operating on different frequency...
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