Frequency agile radio

Pulse or digital communications – Repeaters – Testing

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Details

380 34, 380 48, 342 18, H04B 1500, H04L 2726, G01S 736

Patent

active

053115414

ABSTRACT:
A frequency agile spread spectrum radio system which is capable of efficient frequency re-use and frequency sharing. The receiver adaptively learns which frequencies to avoid. The transmitter sends redundant transmissions on widely separated pseudo-random carrier frequencies to overcome jammed channels. A coded preamble is used to provide a greatly enhanced hybrid form of Time Division Multiple Access/Frequency Division Multiple Access for co-existence and frequency re-use with nearby systems. Anti-jam margins of 60 to 90 dB can be inexpensively achieved, far exceeding that of traditional direct sequence systems.

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M. K. Siman, J. K. Omura, R. A. Scholtz & B. K. Levitt, "Spread Spectrum Communications," vol. 3, pp. 208-279 & pp. 346-407, Rockville, Maryland: Computer Science Press, 1985.

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