1 research outputs found
Secure Transmission in Amplify and Forward Networks for Multiple Degraded Eavesdroppers
We have evaluated the optimal secrecy rate for Amplify-and-Forward (AF) relay
networks with multiple eavesdroppers. Assuming i.i.d. Gaussian noise at the
destination and the eavesdroppers, we have devised technique to calculate
optimal scaling factor for relay nodes to obtain optimal secrecy rate under
both sum power constraint and individual power constraint. Initially, we have
considered special channel conditions for both destination and eavesdroppers,
which led us to analytical solution of the problem. Contrarily, the general
scenario being a non-convex optimization problem, not only lacks an analytical
solution, but also is hard to solve. Therefore, we have proposed an efficiently
solvable quadratic program (QP) which provides a sub-optimal solution to the
original problem. Then, we have devised an iterative scheme for calculating
optimal scaling factor efficiently for both the sum power and individual power
constraint scenario. Necessary figures are provided in result section to affirm
the validity of our proposed solution