Ergodic Secrecy Rate of Optimal Source-Destination Pair Selection in Frequency-Selective Fading

Node selection is a simple technique to achieve diversity and thereby enhance the physical layer security in future wireless communication systems which require low complexity. High-speed data transmission often encounters frequency selective fading. In this context, we evaluate exact closed-form expression for ergodic secrecy rate (ESR) of optimal source-destination pair scheme with single-carrier cyclic-prefix modulation, where destination eavesdropper channels both exhibit independent fading an arbitrary number multipath components. A simplified analysis high-SNR scenario along asymptotic also provided. We derive compare corresponding results sub-optimal scheme. show that our produces ESR under narrowband Nakagami-$m$ channel any integer parameter $m$. The effect transmitters, eavesdropping paths correlation on demonstrated. Our solution approach general can be used find wider variety transmitter schemes.