This paper considers a MIMO communication system that includes a transmitter, a legitimate receiver and an eavesdropper. In such a scenario, the eavesdropper has the knowledge of the pilot and utilizes pilot contamination to reduce the secrecy rate. Firstly, we analyze the effects of malicious pilot contamination on channel estimation. The more the pilot contamination power is, the more the eavesdropping performance enhances, by deducing the secrecy rate and its asymptotic expression in the data transmission phase. Besides, the optimal power allocation scheme for a full-duplex eavesdropper to simultaneously transmit pilot contamination and noise jamming is further studied. Simulation results show that the average secrecy rate with pilot contamination is 0.899bits/s/Hz less than that with noise jamming when the jamming power is 10 mW.
Abstract-In wireless network, when using classical game theory to study physical layer security, the energy-limited transmission nodes tend to choose non-cooperative strategy in order to maximize their own secrecy rate, resulting in reduced network secrecy rate. To solve this problem, the paper proposes a cooperative interference method for physical layer security based on evolutionary game. First, it defines the strategies (sending artificial noise or signal) and benefits (secrecy rate under different strategy combination) according to the evolutionary game. Then, the transmission nodes adjust strategy to maximize benefits based on current network state and difference between cooperation benefit and average expected benefit; Finally, the conditions that the transmitting nodes can cooperate with each other could achieve, and the network is evolution from an unstable state to a stable cooperative state to improve the secrecy rate of the system. Simulation and analysis results show that under the Gaussian channel, compared to the traditional game method, the network secrecy rate of the proposed method can be improved 1bit/s/Hz. Index Terms-Secrecy rate, evolutionary game, cooperative interference, eavesdropper.
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