A coded modulation system based on convolutional coding and constellation control and the coded modulation method

摘要

The present invention relates to an encoding modulation system using constellation control according to a convolutional code and a code rate. In particular, the present invention uses a convolutional encoder in which only four types of code sequences are generated and codes the generated four code sequences as 4-PSK phase shift keying) signal constellation. Signs with close Hamming distances between the code sequences are located close to the signal constellation. Convolutional codes and constellation control are used to place the distances far from the signal constellation between codes having large Hamming distances. An encoding modulation system and a coding modulation method thereof.