Boundaries as an Enhancement Technique for Physical Layer Security

In this paper, we study the receiver performance with physical layer security in a Poisson field of interferers. We compare the performance in two deployment scenarios: 1) the receiver is located at the corner of a quadrant and 2) the receiver is located in the infinite plane. When the channel state information (CSI) of the eavesdropper is not available at the transmitter, we calculate the probability of secure connectivity using the Wyner coding scheme and show that hiding the receiver at the corner is beneficial at high rates of the transmitted code words and detrimental at low transmission rates. When the CSI is available, we show that the average secrecy capacity is higher when the receiver is located at the corner, even if the intensity of interferers in this case is four times higher than the intensity of interferers in the bulk. Therefore, boundaries can also be used as a secrecy enhancement technique for high-data-rate applications.