Performance analysis of secure communications over dual correlated Rician fading channels

Wireless secrecy under dual correlated Rician fading environments is theoretically studied for correlated Source-Destination and Source-Wiretapper channels. Without considering wiretapper active jamming capability, expressions for (i) the ergodic secrecy capacity when the wiretapper is active, and (ii) secrecy outage probability when the wiretapper is passive, are obtained. To further improve system security, new secrecy analyses employing an adaptive encoder with on/off transmission are also given. The new findings exactly reduce to existing findings under dual correlated Rayleigh fading, and advance theoretical developments for wireless secrecy under dual correlated Rician fading. Monte Carlo simulation results are given, which match theoretical predictions. Under wireless secrecy context, the disadvantage of line-of-sight (LoS) power and channel correlation is evidently shown, revealing the nonusefulness of LoS power, and establishing a trade-off between transmission security and transmission success. Benefits of a high average transmit signal-to-noise ratio are discussed.