arXiv:2609.00779 · v4

Coding for Multiple Reverse-Complement and Palindromic Duplications

首次提交 2026-09-01 14:20

版本更新 2026-11-09 13:45

雷达观测 2026-11-10 13:18

摘要

Reverse-complement (RC) and palindromic (PAL) duplications insert a reversed copy of a length-$k$ block immediately after the block; an RC duplication also applies a fixed involutive complement to the inserted symbols. We study $q$-ary codes correcting $t$ such operations applied in sequence, where later operations may copy inserted symbols. For fixed $q\geq2$ and $k,t\geq1$, we prove that every length-$n$ code $C$ for either channel has redundancy $n-\log_q|C|\geq t\log_q n-O_{q,k,t}(1)$; for fixed $q,k$ and $1\leq t=t(n)=o(n)$ the lower bound is $t\log_q(n/t)-O_{q,k}(t)$. For fixed $k$, known codes for one length-$k$ insertion burst attain redundancy $\log_q n+O_{q,k}(1)$ for a single duplication of either type. For every even $k$ and any involutive complement, we show that the two channels are equivalent for every number of errors: the bijection complementing every other coordinate turns each RC duplication into a PAL duplication. This bijection therefore converts any $t$-error-correcting RC code into a PAL code of the same size, and conversely, with linear-time transfer of encoders and decoders. For every even $k$, we also determine the maximum number of descendants of one word under exactly two errors; by the bijection, it is the same for both channels. For fixed even $k$, a direct count using this maximum proves the existence of two-error-correcting PAL and RC codes with redundancy at most $4\log_q n+O_{q,k}(1)$. A known existence bound for two deletion bursts transfers to insertions with the same leading term as ours and a larger additive constant. For two errors, the converse gives $2\log_q n-O_{q,k}(1)$, a factor of two below these existence bounds.

作者备注：33 pages