Rate compatible modulation with unequal error protection property

In this paper, we propose a novel modulation scheme for rate compatible modulation (RCM) to provide flexible unequal error protection (UEP) property. In the proposed scheme, the whole data sequence is divided into several sets, where different sets have different error protection requirements. By analyzing the error probability, we propose a weight selection method to improve the BER performance of RCM scheme with UEP property. The proposed method average the squared weight coefficient of all information bits in a certain set by carefully selecting the information bits. Simulation results show that the proposed scheme provides flexible UEP property. Moreover, the BER performance of the proposed weight selection method outperforms the original random selection method, significantly.