DC-free error-correcting codes: based on partition chain are presented in t
his paper. The partition chain can be constructed from code partition chain
of Reed-Muller codes. The line coding parameters fur the partition chain s
uch as maximum runlength and running digital sum are obtained. The trellis
and multilevel code structure can be used to design the DC-free error-corre
cting codes. Especially, by adopting DC-free trellis codes as constituent c
odes. DC-free turbo codes carl be designed. As results. the presented DC-fr
ee error-correcting codes have good coding characteristics.