Physical Layer Security in Large-Scale Random Multiple Access Wireless Sensor Networks: A Stochastic Geometry Approach

This paper investigates physical layer security for a large-scale WSN with random multiple access, where each fusion center in the network randomly schedules number of sensors to upload their sensed data subject overhearing distributed eavesdroppers. We propose an uncoordinated jamming scheme which those unscheduled send signals certain probability defeat With aid stochastic geometry theory and order statistics, we derive analytical expressions connection outage secrecy characterize transmission reliability secrecy, respectively. Based on obtained results, formulate optimization problem maximizing sum throughput both constraints, considering joint design wiretap code rates scheduled sensor sensors. provide optimal low-complexity sub-optimal algorithms tackle above problem, further reveal various properties parameters are useful guide practical designs. In particular, demonstrate that proposed is beneficial improving throughput, result trade-off between throughput. also show performance approaches one when facing stringent constraint or loose constraint.