Frequency signal generator apparatus and method for simulating interference in mobile communication systems
First Claim
Patent Images
1. A multiple-frequency signal generator for generating a plurality of frequencies having a predetermined frequency-spacing comprising:
- first signal generator means for generating a signal having a first predetermined frequency;
frequency multiplier means coupled to said signal generator means for providing signals having frequencies which are integral multiples of said first predetermined frequency;
carrier signal generator means for providing a carrier signal having a carrier frequency;
first mixing means coupled to said frequency multiplier means and said carrier signal generator means for generating signals having frequencies being at least some of the sums and differences between said carrier frequency and the frequencies of signals generated by said frequency multiplier means;
second signal generator means for generating a signal having a second predetermined frequency;
second mixing means, coupled to said second signal generator means, said first mixing means, and said carrier signal generator means, for generating signals having frequencies which are at least some of the sums and differences between the frequencies of said signals generated by said carrier signal generator means and said first mixing means and said second predetermined frequency;
filter means for filtering signals coupled thereto; and
means for coupling said carrier signal and signals generated by said first and second mixing means to said filter means.
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Abstract
This invention is a multiple-frequency signal generator apparatus and method primarily for simulating a cell site interference environment for electromagnetic communications systems. The generator can produce a plurality of frequencies having a frequency-spacing of d cycles per second. The invention comprises a single frequency multiplier, at least three oscillators and two mixers for providing a multitude of frequencies closely spaced about a carrier frequency. The simple design and components avoid complexity and save costs.
121 Citations
12 Claims
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1. A multiple-frequency signal generator for generating a plurality of frequencies having a predetermined frequency-spacing comprising:
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first signal generator means for generating a signal having a first predetermined frequency; frequency multiplier means coupled to said signal generator means for providing signals having frequencies which are integral multiples of said first predetermined frequency; carrier signal generator means for providing a carrier signal having a carrier frequency; first mixing means coupled to said frequency multiplier means and said carrier signal generator means for generating signals having frequencies being at least some of the sums and differences between said carrier frequency and the frequencies of signals generated by said frequency multiplier means; second signal generator means for generating a signal having a second predetermined frequency; second mixing means, coupled to said second signal generator means, said first mixing means, and said carrier signal generator means, for generating signals having frequencies which are at least some of the sums and differences between the frequencies of said signals generated by said carrier signal generator means and said first mixing means and said second predetermined frequency; filter means for filtering signals coupled thereto; and means for coupling said carrier signal and signals generated by said first and second mixing means to said filter means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A multiple-frequency signal generator for generating a plurality of frequencies having a predetermined frequency-spacing comprising:
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first signal generator means for generating a signal having a first predetermined frequency; frequency multiplier means coupled to said signal generator means for providing signals having frequencies which are integral multiples of said first predetermined frequency; carrier signal generator means for providing a carrier signal having a carrier frequency; first mixing means coupled to said frequency multiplier means and said carrier signal generator means for generating signals having frequencies being at least some of the sums and differences between said carrier frequency and the frequencies of signals generated by said frequency multiplier means; second signal generator means for generating a signal having a second predetermined frequency; second mixing means, coupled to said second signal generator means, said first mixing means, and said carrier signal generator means, for generating signals having frequencies which are at least some of the sums and differences between the frequencies of said signals generated by said carrier signal generator means and said first mixing means and said second predetermined frequency; filter means for filtering signals coupled thereto; a plurality of K mixing blocks comprising a first mixing block, a Kth mixing block, and (K-2) mixing blocks, each of said K mixing blocks having an input port and an output port, the input port of said Kth mixing block being coupled to said carrier signal generator means and said first and said second mixing means, the input port of each of said (K-2) mixing blocks and said first mixing block being coupled to a corresponding output port of said (K-2) mixing blocks and said Kth mixing block, each of said K mixing blocks generating signals having frequencies as a function of the frequencies of the signals at its input port; and means for coupling the output port of said first mixing block to said filter means. - View Dependent Claims (9, 10)
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11. A method for generating a plurality of frequencies having a predetermined frequency-spacing, comprising the steps of:
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generating a first signal having a first predetermined frequency; integrally frequency-multiplying said first signal; generating a carrier signal; mixing said integrally frequency-multiplied first signal and said carrier signal to produce a first mixed signal comprising signals having frequencies substantially equal to the sums and differences between said carrier signal and said integrally frequency-multiplied signals; generating a second signal having a second predetermined frequency; mixing said first mixed signal and said carrier signal with said second signal to produce a second mixed signal; and filtering said first mixed signal, said carrier signal and second mixed signal. - View Dependent Claims (12)
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Specification