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Adaptive Wireless Channel Probing for Shared Key Generation Based on PID Controller
Sept. 2013 (vol. 12 no. 9)
pp. 1842-1852
Yunchuan Wei, Beijing Institute of Technology, Beijing
Kai Zeng, University of Michigan at Dearborn, Dearborn
Prasant Mohapatra, University of California at Davis, Davis
Generating a shared key between two parties from the wireless channel is an increasingly interesting topic. The process of obtaining information from the wireless channel is called channel probing. Previous key generation schemes probe the channel at a preset and constant rate without any consideration of channel variation or probing efficiency. To satisfy the usersâ requirements for key generation rate (KGR) and to use the wireless channel efficiently, we propose an adaptive channel probing scheme based on the proportional-integral-derivative controller, which is used to tune the probing rate. Moreover, we use the Lempel-Ziv complexity to estimate the entropy rate of channel statistics (received signal strength), which is considered as an indicator of probing efficiency. The experimental results show that the controller can dynamically tune the probing rate and, meanwhile, to achieve a user desired KGR. It stabilizes the KGR at the desired value with error below 1 bit/s. Besides, channel probing process is efficient under different user velocities, motion types, and sites.
Index Terms:
Wireless communication,Entropy,Correlation,Probes,Channel estimation,Communication system security,Privacy,PID controller,Wireless channel probing,shared key generation,information theory
Yunchuan Wei, Kai Zeng, Prasant Mohapatra, "Adaptive Wireless Channel Probing for Shared Key Generation Based on PID Controller," IEEE Transactions on Mobile Computing, vol. 12, no. 9, pp. 1842-1852, Sept. 2013, doi:10.1109/TMC.2012.144
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