Secrecy sum-rate based illegitimate relay selection

ABSTRACT This study presents the secrecy performance of sum-rate-based illegitimate relay selection policy for the two-way relay-assisted network. Two-hop multiple half- and full-duplex two-way illegitimate relay network and a limited number of friendly jammers, affecting to the illegitimate relays, are considered in the system model. Extensive computer simulation results reveal that the secrecy sum-rate-based full-duplex illegitimate relay selection policy outperforms the half-duplex-based counterpart in terms of outage performance. Simulation results also show that the secrecy sum-rate-based relay selection policy provides a better secrecy performance than the max-min-based selection algorithm. The obtained performance results also show that secrecy max-min- and sum-rate-based selection strategies achieve a cooperative diversity order, equal to the number of paths between legitimate and illegitimate terminals, in high signal-to-noise ratios. Also, results indicate that secrecy sum-rate-based selection provides better throughput performance than the max-min-based alternative for half-duplex and full-duplex modes. Finally, results show that a large number of friendly jammers do not severely affect the system secrecy performance if they are located relatively far from the illegitimate relay terminal.