Frequency hopping method and apparatus
First Claim
1. Apparatus for providing a sequence of digital control words to a frequency synthesizer in a frequency hopping communication system, each control word adapted to cause the frequency synthesizer to generate a carrier signal at a particular carrier signal frequency, the apparatus comprising:
- (a) a control word memory having a plurality of memory locations for storing said control words, an address input coupled to receive a prepared sequence of addresses, a data output coupled to provide control words from addressed memory locations to the frequency synthesizer, and a data input for receiving the control words to be stored in the memory locations; and
(b) control word supply means for providing control words to the data input of the control word memory for storage in the memory locations, the control word supply means comprising;
(i) means for receiving a selection input indicating selected carrier signal frequencies; and
(ii) means for storing the control words corresponding to the selected carrier signal frequencies in the control word memory.
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Accused Products
Abstract
Disclosed is a frequency mapping system (10) including a data processor (12) and a control word memory (16) to be used with a pseudo-random (PN) number generator (32) and a frequency synthesizer (34). The processor receives an input that specifies those frequencies in a frequency band that are available for communications, associates each specified frequency with a respective control word that designates a carrier frequency to the frequency synthesizer, and stores the control words corresponding to the specified frequencies in the control word memory. Once the control word memory is mapped, the PN generator produces code words that address locations in the control word memory whereby the control words in the addressed locations are sent to the frequency synthesizer.
41 Citations
18 Claims
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1. Apparatus for providing a sequence of digital control words to a frequency synthesizer in a frequency hopping communication system, each control word adapted to cause the frequency synthesizer to generate a carrier signal at a particular carrier signal frequency, the apparatus comprising:
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(a) a control word memory having a plurality of memory locations for storing said control words, an address input coupled to receive a prepared sequence of addresses, a data output coupled to provide control words from addressed memory locations to the frequency synthesizer, and a data input for receiving the control words to be stored in the memory locations; and (b) control word supply means for providing control words to the data input of the control word memory for storage in the memory locations, the control word supply means comprising; (i) means for receiving a selection input indicating selected carrier signal frequencies; and (ii) means for storing the control words corresponding to the selected carrier signal frequencies in the control word memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of providing a sequence of digital control words to a frequency synthesizer in a frequency hopping communication system, each control word adapted to cause the frequency synthesizer to generate a carrier signal at a particular carrier signal frequency, comprising the steps of:
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(a) receiving information indicative of frequencies selected from a predetermined frequency band that are available for communications at a particular location and time; (b) correlating each selected frequency with its respective control word; and (c) storing the control words that correlate to the selected frequencies in a control word memory having a plurality of addressable locations such that each addressable location contains a control word. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A frequency hopping communication system, comprising:
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(1) a frequency synthesizer for producing a carrier signal at a frequency specified by a digital control word; (2) code generation means for generating a prepared sequence of addresses; and (3) control means, responsive to the sequence of addresses and to a selection input indicating the carrier signal frequencies to be used, for generating a series of digital control words, the control means comprising; (a) a control word memory having a plurality of memory locations for storing control words, an address input coupled to receive the prepared sequence of addresses from the code generation means, a data output coupled to provide control words from addressed memory locations to the frequency synthesizer, and a data input for receiving the control words to be stored in the memory locations; and (b) control word supply means for providing control words to the data input of the control word memory for storage in the memory locations, the control word supply means comprising; (i) means for receiving the selection input indicating selected carrier signal frequencies to be generated by the frequency synthesizer; and (ii) means for providing the control words corresponding to the selected carrier signal frequencies to the control word memory.
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Specification