Secure Information Transmission with Self Jamming SWIPT

Abstract

This article is focused on implementing simultaneous wireless information and power transmission as a physical layer security measure by using artificial noise. A series of high energy precoded symbols is simultaneously transmitted along with the information symbols over a Rayleigh frequency selective fading channel. The high energy precoded symbols act as an artificial noise for the eavesdroppers. The energy symbols are precoded on the basis of a legitimate user’s channel matrix to form a null space vector, which eliminates the interference of energy symbols at the information symbol receiver antennas, while allowing the rectenna to harvest energy from the superimposed information and energy symbols. We analyze the secrecy rate and error rate performance at the receiver under different circumstances, and we show that the performance of the legitimate user can be improved by using the iterative block decision feedback equalization method at the receiver.

Energy Efficient Secure Communication Model against Cooperative Eavesdropper

“…Therefore, smart indoor WCN requires energy efficient secure communication and, therefore, green communication technologies, such as wireless power transfer (WPT), which can be adapted for physical layer security (PLS) [3]. High power signals can be used for WPT and other signal processing applications such as channel estimation [4,5] and as a jamming signal [6,7].…”

“…In our previous research work [6], the system model was considered to have a passive eavesdropper with high channel correlation to the legitimate receiver, which is considered as a major limitation of jammer in a wiretap channel. It is mitigated by increasing the jamming signal power that amplifies the error due to the difference in CSI between both channels.…”

“…The increment in jamming signal power can degrade the eavesdropper's signal to noise ratio (SNR), but this can also increase the negative impact of the jammer's precoding error at legitimate receiver. The effect of the jammer's precoding error at a legitimate receiver can be reduced by using the expected jammer's precoding error as additional noise power feedback in the iterative block decision feedback equalization (IBDFE) decoder [6]. Even though the increase in jamming signal power can increase SNR degradation at the eavesdropper, this is not energy efficient and can degrade the performance of legitimate receiver, if there is any channel estimation error or precoding error in the legitimate network.…”

“…Even though the increase in jamming signal power can increase SNR degradation at the eavesdropper, this is not energy efficient and can degrade the performance of legitimate receiver, if there is any channel estimation error or precoding error in the legitimate network. In [6], the passive eavesdropper does not estimate jamming signal and in this research, the idea of cooperative eavesdropper is explored to estimate jamming signal. Therefore, it is necessary to optimize the jamming signal power and explore counter measures for a cooperative eavesdropper scenario.…”

“…Contrary to J, this adversely affects E2 estimation of X J , the SNR of X J1 and X J2 as an independent signal stream is half the SNR of X J . Thus, J can counteract against the active cooperative eavesdropper network by adjusting β value while considering the SINR value from (8), (13), (6) and (14). The following steps are required to find the optimum β value.…”