The theorem and performance analysis of 1/3 Continuous Phase Chirp Keying modulation

In order to increase frequency efficiency in bandwidth-limited wireless communication, a new digital band-pass modulation method named as 1/3 Continuous Phase Chirp Keying (1/3-CPCK) was proposed. Using very minimum frequency shift chirp (VMFS-chirp) signal as carrier, energy concentration of 1/3-CPCK modulated signal is high. The characteristics of modulated signal and system were analyzed such as energy concentration and orthogonality as well as the ability of AWGN suppression in total-band and band-limited channel. Theoretical analysis and simulation results shows that compared with VMCK modulated signal 1/3-CPCK modulated signal has a higher energy concentration. In bandwidth limited AWGN channel, orthogonal 1/3-CPCK system, based on coherent demodulation has 3dB processing gain compared with VMCK system.