Reconfigurable antenna based solutions for device authentication and intrusion detection in wireless networks
First Claim
1. A method of detecting intrusion into a wireless transmission between a transmitter and a receiver in a communication system using at least one multi-mode reconfigurable antenna, comprising:
- at a physical layer of the multi-mode reconfigurable antenna, determining wireless channel information between said transmitter and receiver for different antenna modes of said at least one multi-mode reconfigurable antenna;
determining, based on the wireless channel information for the different antenna modes, a likelihood ratio function associated with the wireless channel information, wherein the likelihood ratio function comprises an estimate of cumulative wireless channel information between the transmitter and receiver;
determining a threshold for the likelihood ratio function based at least on a maximum value generated by applying a generalized likelihood ratio test to a sequence of channel estimate values generated during an initial training period of the transmitter;
determining, via use of the generalized likelihood ratio test, if the likelihood ratio function exceeds the predetermined threshold during the wireless transmission; and
generating an alarm when the predetermined threshold is exceeded, said exceeding being representative of an intrusion.
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Accused Products
Abstract
Channel based authentication schemes for intrusion detection that operates at the physical layer are described that apply the capabilities of a pattern reconfigurable antenna for improved performance. Performance gains are achieved by the schemes as a function of the number of antenna modes. The first scheme relies on a channel based fingerprint for differentiating between transmitters whereas another scheme poses the intruder detection problem as a generalized likelihood ratio (GLR) test problem that operates on the channel realizations corresponding to different modes present in a reconfigurable antenna. The benefits of these two schemes over single element antennas are demonstrated. General guidelines are provided on how to choose the different elements of the decision metric in order to realize better performance for physical layer based authentication schemes based on any diversity scheme.
32 Citations
10 Claims
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1. A method of detecting intrusion into a wireless transmission between a transmitter and a receiver in a communication system using at least one multi-mode reconfigurable antenna, comprising:
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at a physical layer of the multi-mode reconfigurable antenna, determining wireless channel information between said transmitter and receiver for different antenna modes of said at least one multi-mode reconfigurable antenna; determining, based on the wireless channel information for the different antenna modes, a likelihood ratio function associated with the wireless channel information, wherein the likelihood ratio function comprises an estimate of cumulative wireless channel information between the transmitter and receiver; determining a threshold for the likelihood ratio function based at least on a maximum value generated by applying a generalized likelihood ratio test to a sequence of channel estimate values generated during an initial training period of the transmitter; determining, via use of the generalized likelihood ratio test, if the likelihood ratio function exceeds the predetermined threshold during the wireless transmission; and generating an alarm when the predetermined threshold is exceeded, said exceeding being representative of an intrusion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification