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Polar Coding for the Multiple Access Wiretap Channel With Partial Rate-Limited Feedback via Rate-Splitting
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Summary
This paper proposes an explicit polar coding scheme for a two-user discrete memoryless multiple access wiretap channel with partial rate-limited feedback (MAC-WT-PLF). The feedback creates correlation between channel inputs, which existing polar schemes assuming independent inputs cannot support, and the scheme combines source polarization, block Markov coding, superposition coding, lossy source coding and rate-splitting. Asymptotic analysis establishes that it ensures reliability and strong secrecy and attains the entire achievable secrecy rate region from prior work.