A practical viewpoint on the performance of LDPC codes over the fast Rayleigh fading wire-tap channel

In this paper, we carry out a practical assessment of the performance of finite-length LDPC codes over the wiretap channel with fast Rayleigh fading. Classical metrics for physical layer security, like the secrecy capacity, are based on information theoretic arguments, and provide the ultimate security bounds for these schemes. However, it is difficult to design practical schemes, using some specific finite-length code, able to approach such a performance. Then we use a more practical metric, based on the error probability, which allows assessing the performance achieved in terms of both reliability and security over the fast Rayleigh fading wire-tap channel.