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Several classes of BCH codes of length $n=\frac{q^{m}-1}{2}$
Mengchen Lian · 2024-05-30 · via cs.IT updates on arXiv.org

BCH codes are an important class of linear codes and find extensive utilization in communication and disk storage systems.This paper mainly analyzes the negacyclic BCH code and cyclic BCH code of length $\frac{q^m-1}{2}$. For negacyclic BCH code, we give the dimensions of $C_{(n,-1,\left\lceil \frac{δ+1}{2}\right\rceil,0)}$ for $δ=a\frac{q^m-1}{q-1},aq^{m-1}-1$($1\leq a <\frac{q-1}{2}$) and $δ=a\frac{q^m-1}{q-1}+b\frac{q^m-1}{q^2-1},aq^{m-1}+(a+b)q^{m-2}-1$ $(2\mid m,1\leq a+b \leq q-1$,$\left\lceil \frac{q-a-2}{2}\right\rceil\geq 1)$. Furthermore, the dimensions of negacyclic BCH codes $C_{(n,-1,δ,0)}$ with few nonzeros and $C_{(n,-1,δ,b)}$ with $b\neq 0$ are settled. For cyclic BCH code, we give the weight distribution of extended code $\overline{C}_{(n,1,δ,1)}$ and the parameters of dual code $C^{\perp}_{(n,1,δ,1)}$, where $δ_2\leq δ\leq δ_1$.

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