Joint source-channel coding for Multiple-Access Wiretap Channels

In this paper, we consider lossy source transmission over a Multiple Access WireTap Channel (MAC-WT). In this model, there are two correlated sources, each of them is available at the corresponding encoder. The receiver tries to reconstruct both sources with desired distortions. The sources should be kept secret from an eavesdropper. We propose a joint source-channel scheme for the MAC-WT. In this scheme, each source sequence is mapped to common and private codewords. The common codeword can be decoded by the eavesdropper. The private codeword needs to be kept secret from the eavesdropper by using Wyner´s wiretap coding. We also discuss some special cases of the proposed scheme.