APPLICATION OF OPTIMIZING TECHNIQUES FOR BEAMFORMING PROBLEMS IN WIRELESS TRANSMISSION WITH PHYSICAL SECURITY BACKGROUND

Abstract

Beamforming optimization problems (BF) in wireless transmission are often
formulated using unidentified (non-convex) quadratic optimization equations with
the typical method of solving is using SDR technology along with random
technique. However, in many cases, these solutions yield results far below the
optimal value especially when the matrix rank of optimization variables is greater
than 1. In our paper, the beamforming problem is set in the context of physical
layer security when an intruder is eavesdropping with the requirement to suppress
the intruding object while ensuring the signal quality of official receivers together
with minimizing the transmit power. Since then, a more efficient iterative
algorithm is proposed; simulation results show that our proposed method yields
near optimal results and is superior to the conventional approach.