Author

Vincent Y. F. Tan

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Preprint Sep 2026

Second-Order Asymptotics for the Gaussian MAC on the Relative Interior of the Sum-Rate Face

We completely characterize the second-order coding rate region of the two-user Gaussian multiple-access channel at points in the relative interior of the sum-rate face, under maximal per-codeword power constraints. For any fixed average error probability $0<\varepsilon<1/2$, a nontrivial mixture of power splits reduces...

Vincent Y. F. Tan · 0 citations

Preprint Aug 2026

Second-Order Asymptotics for the Gaussian Multiple-Access Channel at Corner Points

We establish exact second-order coding rate regions at the two corner points of the capacity region of the two-user Gaussian multiple-access channel. For any average error probability $\varepsilon\in(0,1)$, we characterize the $n^{-1/2}$-scale fluctuations of achievable rates around each corner point, proving a convers...

Vincent Y. F. Tan · 1 citation