Nonlinear multi-pulse block coding of CPFSK signals

A nonlinear multi-pulse block coding technique is proposed to improve CPFSK signaling formats. The coding technique is designed to prevent merging events with lower distances by separating the respective paths in time domain without increasing the number of states. It is demonstrated with constant h, 2-h, and trellis coded signals, that the proposed coding technique can significantly increase the minimum distance, while maintaining very high code rates to limit the bandwidth expansion