Coded continuous phase modulation combined with nonuniform mapping and multi‐h scheme

The convolutional coding combined with continuous phase modulation (CPM) has been shown as a good tradeoff between coding and bandwidth. This paper proposes the coded CPM with the nonuniform signal constellation and the multi‐h scheme to achieve further coding gains over the conventional uniform mapping single‐h coded CPM. Using the minimum Euclidean distance, the number of merge events up to a certain depth in the state trellis and the average bandwidth as estimated criteria, the performance of the non‐uniform multi‐h coded CPM is analyzed. It is found that the nonuniform multi‐h coded CPM achieves larger Euclidean distance and diminishes the number of merge events without expanding the bandwidth.