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Successful establishment of secret encryption keys based on bidirectional estimates of the multipath propagation channel depends critically on the reciprocity of the observed channel coefficients. Since typical radio circuitry is not reciprocal, calibration is required to remove the impact of non-reciprocal channel contributions. This paper reports on the impact of circuit non-reciprocity on key establishment...
This work integrates electromagnetic analysis with circuit theory to explore the impact of antenna mutual coupling and radio frequency circuit design on the achievable performance of methods that establish secret encryption keys using reciprocal propagation channels. The analysis includes the impact of the impedance match between the coupled antennas and the transmit sources or receiver loads, demonstrating...
In radio frequency fingerprinting, observations of the impact of unique imperfections in the transmitter circuitry on the transmitted waveform are used to identify the device from which the data was transmitted. While this technique can be used to authenticate radios accessing a secure network, the security of the authentication can be enhanced if the transmitter fingerprint changes based on the transmitted...
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