Constellation mapping method

A constellation mapping method is provided. The method includes: for each modulation symbol unit to be mapped of the part or all modulation symbol units to be mapped in the bit sequence to be mapped, the bits are inverted (S502); each inverted modulation symbol unit to be mapped is mapped to be the modulation symbol in the constellation (S504). By the invention, the phenomenon that the continue bits have the same reliability can be avoided effectively and the link capability can be improved by changing the inhomogeneity of the reliability distribution of the continue bits.