The Secrecy Transmission Capacity Of Wireless Large-Scale Ad Hoc Network

Stochastic geometry theory, a young branch of mathematics, is newly developed. Since the late1990s, its theory in the wireless communication network modeling, simulation has initial development. Random geometric theory has the advantage of applicability and feasibility of performance analysis in the modeling of large-scale network, which gives it a good application prospect in analyzing wireless network area. At the same time, random geometric theory in the wireless communication network capacity research have achieved a lot, it has become significant field of communication theoretical research.The secrecy broadcast transmission capacity of wireless Ad hoc network, which is defined as the product among the spatial density of broadcast transmissions without secrecy outage, the average number of neighbors of a broadcasting node, and the secrecy rate. This paper mainly focuses on the research of secrecy broadcast transmission capacity based on stochastic geometry model. Moreover, based on new model, I propose new method to enhance the secrecy of transmission capacity.First, we use independent Poisson point process (PPP) to model the scenario where a wireless Ad hoc broadcast network coexists with a wiretapping network, which means that the two networks are independent. We give the definition of the average number of receiver, the average number of eavesdropping neighbors that causes secrecy outage and the secrecy broadcast transmission capacity over general fading and Rayleigh fading channels. Then we characterize them. When the broadcast network and eavesdropping network are deployed as independent Poisson point process (The two networks are correlated), we analyze the average number of neighbors and then characterize the secrecy broadcast transmission capacity over general fading and Rayleigh fading channels. Then we derive the average number of eavesdropping neighbors and the secrecy broadcast transmission capacity. We also discuss the impact of correlation on capacity.To enhance the security of secrecy message transmission or transmission capacity, we propose MIMO and new artificial noise generation method. Assume each eavesdropper has a single antenna, while each legitimate node is equipped with multiple antennas. Broadcast nodes use part of spatial transmit degrees of freedom (STDOF) to transmit multiple independent date streams, while each receiver use part of its spatial receive degrees of freedom (SRDOF) to cancel interferers, and other SRDOF are used to decode information. Nearest interference cancellation and constrained maximum SIR used to cancel interference. We analyze the the average number of receiver, the average number of eavesdropping neighbors and the secrecy broadcast transmission capacity.For artificial noise generation scheme, we assume that the transmitted frame contains artificial noise and related information. So no MIMO or helper relay need to generate artificial noise. And no eavesdroppers can decode it, while according whether the legitimate receivers can decode it, we divide ideal case, sub ideal case and general case. Then we discuss transmission outage and secrecy outage in each case. Our results show that we can enhance transmission security in terms of sacrificing the success transmission probability in sub ideal case and general case.