Exact secrecy throughput capacity study in mobile ad hoc networks

The secrecy throughput capacity (STC) performance study of mobile ad hoc networks (MANETs) is critical for supporting their applications in security-sensitive scenarios. Despite much work on the scaling law results of MANET STC, the exact STC study of such networks remains an open problem. This paper, for the first time, investigates the exact STC of a cell-partitioned MANET with group-based scheduling scheme from the physical layer (PHY) security perspective. We first propose two secure transmission schemes based on the PHY security technology, i.e., secrecy guard zone based and cooperative jamming based schemes. The secrecy guard zone based scheme allows transmissions to be conducted only if no eavesdroppers exist in the secrecy guard zone around transmitters. The cooperative jamming based scheme utilizes non-transmitting nodes to generate artificial noise to suppress eavesdroppers in the same cell, such that transmissions can be conducted only if all eavesdroppers in the transmission range are suppressed. We then derive exact analytical expressions for the STC performance of the concerned network under both secure transmission schemes based on the analysis of two basic secure transmission probabilities. Finally, extensive simulation and numerical results are provided to corroborate our theoretical analysis and also to illustrate the STC performance of the concerned MANET.