Convolutional code design for secure transmission on a two-link compound wiretap channel

In this work, the construction of non-recursive nonsystematic convolutional codes that allow to achieve secure transmission over a two-link compound wiretap channel is proposed. The code design goal is that, whenever an eavesdropper has access to one of the two links, he cannot recover any of the transmitted information bits. Secure transmission is achieved by considering a special family of convolutional codes (denoted as ambiguous) combined with channel multiplexing, initially designed for blockfading channels. Error rate curves over Gaussian noise channels and based on Monte Carlo simulations are finally shown.