Nonlinear asymmetrical multi-h phase codes combined with continuous phase modulation

A novel trellis coding system called nonlinear asymmetrical multi-h signaling is introduced with continuous phase modulation (CPM) signals. Nonlinear asymmetrical multi-h signals select modulation indices depending on the current symbol, previous symbol and the current symbol interval. Binary nonlinear asymmetrical multi-h signaling schemes are constructed and analyzed. The numerical results indicate that nonlinear asymmetrical multi-h signals achieve significantly higher distance than other multi-h formats reported in the literature