Algorithm

Discrete mathematics

Bounded function

Decoding methods

BCH code

Mathematics

Mathematical analysis

Combinatorics

Finite field

Modulo

Coset

Arithmetic

Advances in Mathematics of Communications

In this paper, we study LCD BCH codes over the finite field GF$(q)$ with two types of lengths $n$, where $n = q^l+1$ and $n = (q^l+1)/(q+1)$. Several classes of LCD BCH codes are given and their parameters are determined or bounded by exploring the cyclotomic cosets modulo $n$. For $n = q^l+1$, we determine the dimensions of the codes with designed distance $δ$, where $q^{\lfloor\frac{l+1}{2}\rfloor}+1 ≤ δ ≤q ^{\lfloor\frac{l+3}{2}\rfloor}+1$. For $n = (q^l+1)/(q+1)$, the dimensions of the codes with designed distance $δ$ are presented, where $2 ≤ δ ≤q ^\frac{l-1}{2}+1$.

Parameters of LCD BCH codes with two lengths