Pulse or digital communications – Repeaters – Testing
Patent
1993-08-10
1994-12-27
Barron, Jr., Gilberto
Pulse or digital communications
Repeaters
Testing
342 18, 370 50, 380 34, H04J 400, H04L 2726
Patent
active
053772229
ABSTRACT:
A frequency agile spread spectrum radio system which uses a frequency-agile receiver that adaptively learns which frequencies to avoid as being occupied or jammed. 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. The receiver scans the radio spectrum, identifies occupied portions, stores information on these occupied portions, skips over the occupied portions for a set period of time while scanning for radio signals, detects a repetitive preamble code in a received radio signal, maintains the frequency of the received radio signal, and receives and decodes message data in the received radio signal.
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Axonn Corporation
Barron Jr. Gilberto
LandOfFree
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