Frequency hopping data communication system
First Claim
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1. A frequency hopping data communication system having a random location of mark and space frequencies over a transmission bandwidth, comprising:
- first means responsive to a first clock signal having a pedetermined bit rate to produce identical first and second pseudo-noise code streams time displaced with respect to each other;
second means coupled to said first means, said second means being responsive to binary data signals having said predetermined bit rate and said first and second code streams to provide a modulated signal for conveying said data signals, said modulated signal having different randomly occurring frequencies representing both the binary conditions of said data signals and the random spacing between said randomly occurring frequencies representing each of said binary conditions of said data signals such that mark and space frequencies are frequency hopped independently;
third means coupled to said second means to receive said modulated signal and to separate said randomly occurring frequencies representing each of said binary conditions from said received modulated signal;
fourth means coupled to said third means to recover said data signals from said separated, received modulated signals; and
fifth means coupled to said third means and said fourth means to synchronize said third means to said received modulated signal.
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Abstract
An improved frequency hopped data communication system with a random transmission of mark and space frequency over the transmission bandwidth to provide independent frequency hopping of the mark and space frequency is provided in the system which is particularly immune to repeater jamming. Only one frequency is transmitted at a time upon selection on a bit instant by a pseudo-noise code generator. The location of the mark and space frequency is randomly chosen, however, the location is known at the transmitter and the repeater by appropriate synchronization equipment.
32 Citations
14 Claims
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1. A frequency hopping data communication system having a random location of mark and space frequencies over a transmission bandwidth, comprising:
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first means responsive to a first clock signal having a pedetermined bit rate to produce identical first and second pseudo-noise code streams time displaced with respect to each other; second means coupled to said first means, said second means being responsive to binary data signals having said predetermined bit rate and said first and second code streams to provide a modulated signal for conveying said data signals, said modulated signal having different randomly occurring frequencies representing both the binary conditions of said data signals and the random spacing between said randomly occurring frequencies representing each of said binary conditions of said data signals such that mark and space frequencies are frequency hopped independently; third means coupled to said second means to receive said modulated signal and to separate said randomly occurring frequencies representing each of said binary conditions from said received modulated signal; fourth means coupled to said third means to recover said data signals from said separated, received modulated signals; and fifth means coupled to said third means and said fourth means to synchronize said third means to said received modulated signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A frequency hopping data communication transmitter for transmitting binary data having a random location of mark and space frequencies over a transmission bandwidth, comprising:
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first means responsive to a clock signal having a predetermined bit rate to produce identical first and second pseudo-noise code streams time displaced with respect to each other; and second means coupled to said first means, said second means being responsive to binary data signals having said predetermined bit rate and said first and second code streams to provide a modulated signal for conveying said data signals, said modulated signal having different randomly occurring frequenices representing both binary conditions of said data signals and random spacing between said randomly occurring frequencies representing each of said binary conditions of said data signals such that mark and space frequencies are frequency hopped independently. - View Dependent Claims (8, 9, 10)
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11. A frequency hopping data communication receiver for receiving binary data signals having a random location of mark and space frequencies over a transmission bandwidth, comprising:
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first means to receive a transmitted signal conveying binary data signals having a predetermined bit rate by means of diferent randomly occurring frequencies representing both binary conditions of said data signals with said randomly occurring frequencies representing each of said binary conditions having random spacing therebetween; second means coupled to said first means to separate said randomly occurring frequencies representing each of said binary conditions from said received transmitted signal; third means coupled to said second means to recover said data signals from said separated, received transmitted signals such that independently frequency hopped mark and space signals are recovered; and fourth means coupled to said second means and said third means to synchronize said second means to said received transmitted signal. - View Dependent Claims (12, 13, 14)
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Specification