Frequency hopping communication system
First Claim
1. A communication system comprising:
- first means to generate a selected code signal;
second means coupled to said first means to produce a first signal having a phase selected according to the code condition of said selected code signal;
third means coupled to said first means to produce a second signal having a frequency that hops to different ones of a plurality of discrete frequencies as determined by said selected code signal; and
a first intelligence signal coupled to one of said second and third means to modulate one of said first and second signals;
said second and third means being interconnected to provide a first propagation signal modulated by said first intelligence signal having a frequency hopping characteristic and a selected phase in each frequency hop interval.
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Accused Products
Abstract
A signal modulated with information is hopped to discrete frequencies and its phase is selected to be 0° or 180° in each frequency hop interval under control of a pseudo noise binary code signal produced by a code generator. The discrete frequencies are generated in a binary frequency synthesizer and the phase is selected by a balanced modulator. One embodiment is a transceiver employing a single code generator for both transmission and reception. In another embodiment, a code generator is employed at the transmitter and another code generator is employed at the receiver of a communication system. In each embodiment, acquisition circuitry is employed to synchronize the code signal to the received frequency hopped and phase selected signal for synchronous detection of the information.
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Citations
10 Claims
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1. A communication system comprising:
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first means to generate a selected code signal; second means coupled to said first means to produce a first signal having a phase selected according to the code condition of said selected code signal; third means coupled to said first means to produce a second signal having a frequency that hops to different ones of a plurality of discrete frequencies as determined by said selected code signal; and a first intelligence signal coupled to one of said second and third means to modulate one of said first and second signals; said second and third means being interconnected to provide a first propagation signal modulated by said first intelligence signal having a frequency hopping characteristic and a selected phase in each frequency hop interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification