用于提升信道容量的新型MSFCSK-Chirp调制方式OA

Chirp modulation,due to its unique linear frequency modulation method,has become a key technology ad-opted by the physical layer of low-power wide-area network(LPWAN).Chirp modulation has a low transmission rate and poor performance in multi-path channels and band interference.To address these issues,a new MSFCSK-Chirp modulation scheme was proposed to improve transmission efficiency.This scheme utilized the multi-slope,multi-band and multi-cyclic shift of Chirp signals to achieve orthogonality among various MSFCSK-Chirp signals.The orthogonal-ity conditions for MSSK-Chirp,MFSK-Chirp and MCSK-Chirp were derived to demonstrate the feasibility of MSFCSK-Chirp.The spectral efficiency of MSFCSK-Chirp was analyzed,proving that it can effectively enhance channel capacity.With spreading factors ranging from 6 to 12,the data transmission rate increases by 16.7%to 33.3%compared to MCSK-Chirp,MFSK-Chirp,and MFCSK-Chirp,while maintaining a lower peak-to-average power ratio(PAPR)than PSK-Chirp.Simulation results further indicate that MSFCSK-Chirp signals exhibit superior multipath resistance compared to MCSK-Chirp signals and better interference resistance than MFSK-Chirp signals.The proposed MSFCSK-Chirp scheme represents a promising alternative for high-transmission data IoT applications in complex channels.