Improved multipoint codes from Hermitian curves

Multipoint codes are a broad class of algebraic geometry codes derived from algebraic functions which have multiple poles and/or zeros on their defining curves. Thus, they are more general than one-point codes which are an important class of algebraic codes. In this paper, we give several improved codes of multipoint codes derived from Hermitian curves by using an improving method introduced by Feng and Rao for one-point codes.