Performance Analysis and Design of Two Edge Type LDPC Codes for the BEC Wiretap Channel
The authors consider transmission over a wiretap channel where both the main channel and the wiretapper's channel are Binary Erasure Channels (BEC). They propose a code construction method using two edge type Low-Density Parity-Check (LDPC) codes based on the coset encoding scheme. Using a standard LDPC ensemble with a given threshold over the BEC, they give a construction for a two edge type LDPC ensemble with the same threshold. If the given standard LDPC ensemble has degree two variable nodes, their construction gives rise to degree one variable nodes in the code used over the main channel.