1 research outputs found
Secure Transmission in Linear Multihop Relaying Networks
This paper studies the design and secrecy performance
of linear multihop networks, in the presence of randomly
distributed eavesdroppers in a large-scale two-dimensional space.
Depending on whether there is feedback from the receiver
to the transmitter, we study two transmission schemes: on-off
transmission (OFT) and non-on-off transmission (NOFT). In
the OFT scheme, transmission is suspended if the instantaneous
received signal-to-noise ratio (SNR) falls below a given threshold,
whereas there is no suspension of transmission in the NOFT
scheme. We investigate the optimal design of the linear multiple
network in terms of the optimal rate parameters of the wiretap
code as well as the optimal number of hops. These design
parameters are highly interrelated since more hops reduces the
distance of per-hop communication which completely changes the
optimal design of the wiretap coding rates. Despite the analytical
difficulty, we are able to characterize the optimal designs and
the resulting secure transmission throughput in mathematically
tractable forms in the high SNR regime. Our numerical results
demonstrate that our analytical results obtained in the high SNR
regime are accurate at practical SNR values. Hence, these results
provide useful guidelines for designing linear multihop networks
with targeted physical layer security performance.This work was supported in part by the Natural
Science Foundation of China under Grant 61401159 and Grant 61771203,
in part by the Pearl River Science and Technology Nova Program of
Guangzhou under Grant 201710010111, and in part by the Guangdong Science
and Technology Plan under Grant 2016A010101009. The work of X. Zhou
was supported by the Australian Research Council Discovery Projects under
Grant DP150103905ARC Discovery Projects Grant DP150103905