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This paper investigates the achievable region and precoder design formultiple access wiretap (MAC-WT) channels, where each user transmits bothsecret and open (i.e., non-confidential) messages. All these messages areintended for the legitimate receiver (or Bob for brevity) and the eavesdropper(Eve) is interested only in the secret messages of all users. By allowing userswith zero secret message rate to act as conventional MAC channel users with nowiretapping, we show that the achievable region of the discrete memoryless (DM)MAC-WT channel given in [1] can be enlarged. In [1], the achievability wasproven by considering the two-user case, making it possible to prove a keyauxiliary lemma by directly using the Fourier-Motzkin elimination procedure.However, this approach does not generalize to the case with any number ofusers. In this paper, we provide a new region that generally enlarges that in[1] and provide general achievability proof.

MAC Wiretap Channels with Confidential and Open Messages: Improved Achievable Region and Low-complexity Precoder Design