Secure modulation and demodulation
First Claim
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1. A modulator circuit, comprising:
- a feedforward filter;
a processor; and
a feedback filter characterized by a plurality of coefficients;
wherein the processor is configured to apply one or more of a maximum function or a minimum function to a processor input signal to provide a processor output signal to be applied to an input of the feedback filter, the processor input signal being a combination of an output of the feedforward filter and an output of the feedback filter,wherein one or more of a configuration of the plurality of coefficients or a configuration of the one or more of the maximum function or the minimum function is based upon a key, andwherein the modulator circuit is comprised in a transmitter, andwherein the transmitter is configured to share the key with a receiving device to configure the receiving device.
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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
17 Claims
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1. A modulator circuit, comprising:
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a feedforward filter; a processor; and a feedback filter characterized by a plurality of coefficients; wherein the processor is configured to apply one or more of a maximum function or a minimum function to a processor input signal to provide a processor output signal to be applied to an input of the feedback filter, the processor input signal being a combination of an output of the feedforward filter and an output of the feedback filter, wherein one or more of a configuration of the plurality of coefficients or a configuration of the one or more of the maximum function or the minimum function is based upon a key, and wherein the modulator circuit is comprised in a transmitter, and wherein the transmitter is configured to share the key with a receiving device to configure the receiving device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method performed by a modulator circuit of a transmitter, the method comprising:
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configuring a feedforward filter, a feedback filter, and a processor of the modulator circuit using a key; filtering an input signal with the configured feedback filter; summing the filtered input signal and a signal output by the configured feedback filter to produce a processor input signal; performing one or more of a maximum function or a minimum function to the processor input signal to provide a processor output signal; and sharing the key with a receiving device to configure the receiving device. - View Dependent Claims (13, 14, 15, 16)
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17. A modulator circuit, comprising:
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a plurality of feedforward filters configured to filter an input signal in accordance with a plurality of sets of feedforward coefficients; a plurality of feedback filters configured to filter a processor output signal in accordance with a plurality of sets of feedback coefficients; a plurality of summers, each summer from among the plurality of summers being configured to combine an output from a corresponding feedforward filter from among the plurality of feedforward filters and an output from a corresponding feedback filter from among the plurality of feedforward filters to provide a corresponding processor input signal from among a plurality of processor input signals; and a processor configured to apply one or more of a maximum function or a minimum function to the plurality of processor input signals to select one of the plurality of processor input signals as the processor output signal, wherein one or more of a configuration of the plurality of sets of feedforward coefficients or the plurality of sets of feedback coefficients or a configuration of the one or more of the maximum function or the minimum function is based upon a key, and wherein the modulator circuit is comprised in a transmitter, and wherein the transmitter is configured to share the key with a receiving device to configure the receiving device.
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Specification