Secure modulation and demodulation
First Claim
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1. A transmitter, comprising:
- a nonlinear keying modulator comprising;
a plurality of nonlinear elements including a processor;
a plurality of linear filters; and
a combination network connecting the plurality of linear filters and the plurality of nonlinear elements including the processor;
wherein the nonlinear keying modulator is configured to encrypt a received signal using the plurality of linear filters and the plurality of nonlinear, elements;
wherein the plurality of linear filters include a plurality of feedforward filters; and
wherein the nonlinear keying modulator is adjustable varying the plurality of feedforward filters.
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Abstract
A system and method are disclosed for securely transmitting and receiving a signal. A nonlinear keying modulator is used in the transmitter to encrypt the signal using a nonlinear keying modulation technique. A nonlinear keying demodulator is used in the receiver to decrypt the signal.
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Citations
18 Claims
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1. A transmitter, comprising:
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a nonlinear keying modulator comprising; a plurality of nonlinear elements including a processor; a plurality of linear filters; and a combination network connecting the plurality of linear filters and the plurality of nonlinear elements including the processor; wherein the nonlinear keying modulator is configured to encrypt a received signal using the plurality of linear filters and the plurality of nonlinear, elements; wherein the plurality of linear filters include a plurality of feedforward filters; and wherein the nonlinear keying modulator is adjustable varying the plurality of feedforward filters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A transmitter, comprising:
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a nonlinear keying modulator comprising; a plurality of nonlinear elements; a plurality of linear filters; and a combination network connecting the plurality of linear filters and the plurality of nonlinear elements; wherein the nonlinear keying modulator is configured to encrypt a received signal using the plurality of linear filters and the plurality of nonlinear elements; wherein the plurality of linear filters include a number of filter coefficients; and wherein the nonlinear keying modulator is adjustable by varying the number of filter coefficients.
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15. A transmitter, comprising:
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a nonlinear keying modulator comprising; a processor; and a plurality of linear filters coupled to the processor, the nonlinear keying modulator configured to encrypt a received signal by; selecting a subset of linear filters of the plurality of linear filters based on a configuration parameter; filtering the received signal using the selected subset of linear filters; and processing an output of the selected subset of linear filters. - View Dependent Claims (16, 17, 18)
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Specification