A Location Prediction-Based Helper Selection Scheme for Suspicious Eavesdroppers

Algorithm 2

The fast helper selection scheme.

Initialization:

   The predicted Eve’s CSI;

   ; .

Determine whether there exist a risk of secure communication between Alice and Bob based on Algorithm 1;

Calculate secrecy rates for all helpers based on the predicted Eve’s CSI;

Find a helper as a jammer by comparing every ;

Calculate information signal power and jamming signal power by (19) and (20) for the helper,

The helper broadcasts artificial noises to jam Eve.