1 research outputs found
Secure SWIPT for Directional Modulation Aided AF Relaying Networks
Secure wireless information and power transfer based on directional
modulation is conceived for amplify-and-forward (AF) relaying networks.
Explicitly, we first formulate a secrecy rate maximization (SRM) problem, which
can be decomposed into a twin-level optimization problem and solved by a
one-dimensional (1D) search and semidefinite relaxation (SDR) technique. Then
in order to reduce the search complexity, we formulate an optimization problem
based on maximizing the signal-to-leakage-AN-noise-ratio (Max-SLANR) criterion,
and transform it into a SDR problem. Additionally, the relaxation is proved to
be tight according to the classic Karush-Kuhn-Tucker (KKT) conditions. Finally,
to reduce the computational complexity, a successive convex approximation (SCA)
scheme is proposed to find a near-optimal solution. The complexity of the SCA
scheme is much lower than that of the SRM and the Max-SLANR schemes. Simulation
results demonstrate that the performance of the SCA scheme is very close to
that of the SRM scheme in terms of its secrecy rate and bit error rate (BER),
but much better than that of the zero forcing (ZF) scheme