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On the suboptimality of linear codes for binary distribut...
[Submitted on 15 Jan 2026 (v1), last revised 9 Jul 2026 (this ve · 2026-01-15 · via stat updates on arXiv.org

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Abstract:We study a binary distributed hypothesis testing problem where two agents observe correlated binary vectors and communicate compressed information at the same rate to a central decision maker. In particular, we study linear compression schemes and show that simple truncation is the best linear scheme in two cases: (1) testing opposite signs of the same magnitude of correlation, and (2) testing for or against independence. We conjecture, supported by numerical evidence, that truncation is the best linear code for testing any correlations of opposite signs. Further, for testing against independence, we also compute classical random coding exponents and show that truncation, and consequently any linear code, is strictly suboptimal.

Submission history

From: Adway Girish [view email]
[v1] Thu, 15 Jan 2026 15:52:23 UTC (947 KB)
[v2] Thu, 9 Jul 2026 23:48:51 UTC (947 KB)