Full duplex wireless transmission with channel phase-based encryption
First Claim
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1. A method comprising:
- at a first transceiver, transmitting a plurality of signals to a second transceiver and receiving corresponding receive signals from the second transceiver, wherein each transmitted signal is sent using a respective channel-perturbation-induced phase characteristic;
measuring a plurality of round-trip phase values, wherein each round-trip phase value is a phase difference between one of the plurality of transmitted signals and corresponding receive signal, each round-trip phase value being dependent upon at least the respective channel-perturbation-induced phase characteristic;
masking symbols of a subsequent phase modulated signal at the first transceiver by using the plurality of measured round-trip phase values to change the phase of the symbols of the subsequent phase modulated signal.
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Abstract
A method comprising: at a first transceiver, transmitting a plurality of signals to a second transceiver and receiving corresponding receive signals from the second transceiver, wherein each transmitted signal is sent using a channel perturbation; measuring a plurality of phase values, wherein each phase value is a phase difference between one of the plurality of transmitted signals and corresponding receive signal; masking a subsequent phase modulated signal employing phase rotation at the first transceiver using the plurality of phase values.
89 Citations
18 Claims
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1. A method comprising:
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at a first transceiver, transmitting a plurality of signals to a second transceiver and receiving corresponding receive signals from the second transceiver, wherein each transmitted signal is sent using a respective channel-perturbation-induced phase characteristic; measuring a plurality of round-trip phase values, wherein each round-trip phase value is a phase difference between one of the plurality of transmitted signals and corresponding receive signal, each round-trip phase value being dependent upon at least the respective channel-perturbation-induced phase characteristic; masking symbols of a subsequent phase modulated signal at the first transceiver by using the plurality of measured round-trip phase values to change the phase of the symbols of the subsequent phase modulated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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in a first channel state, transmitting at least one symbol at a first transceiver and measuring a first relative phase of at least one returned symbol; receiving at least one symbol originating from a second transceiver at the first transceiver and retransmitting the at least one received symbol in the first channel state; perturbing the channel at the first transceiver from a first channel state to a second channel state to change the channel phase; in the second channel state, transmitting at least one additional symbol and measuring a second relative phase of at least one additional returned symbol; receiving at least a second symbol originating from the second transceiver at the first transceiver and retransmitting the at least second received symbol in the second channel state; and
,masking symbols in a subsequent phase modulated signal transmitted by the first transceiver by using the measured first relative phase and the measured second relative phase to change the phase of the symbols of the subsequent phase modulated signal. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification