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Two sets $A, B \subseteq \{0, 1\}^n$ form a Uniquely Decodable Code Pair(UDCP) if every pair $a \in A$, $b \in B$ yields a distinct sum $a+b$, wherethe addition is over $\mathbb{Z}^n$. We show that every UDCP $A, B$, with $|A|= 2^{(1-\epsilon)n}$ and $|B| = 2^{\beta n}$, satisfies $\beta \leq 0.4228+\sqrt{\epsilon}$. For sufficiently small $\epsilon$, this bound significantlyimproves previous bounds by Urbanke and Li~[Information Theory Workshop '98]and Ordentlich and Shayevitz~[2014, arXiv:1412.8415], which upper bound $\beta$by $0.4921$ and $0.4798$, respectively, as $\epsilon$ approaches $0$.

Sharper Upper Bounds for Unbalanced Uniquely Decodable Code Pairs