Digital companding scheme using A I based custom constellation mapping and selection

The data rate is important in telecommunication because it is directly proportional to the cost of transmitting the signal. Saving bits is the same as saving money. In this paper we propose new digital companding scheme based on using different constellation orderings (QAM modulator), depending on the data to be transmitted. The proposed scheme was simulated in Matlab7.4 and it was shown that the proposed companding scheme effective with low compression error.