The Multiple Access PSK-Chirp System and the Demodulation Based on FrFT

With the rapid growth of wireless and mobile communication network users, a chirp system that can support multiple access is required. This paper first introduces the chirp interference system for multiple access based on matched filtering receiver. Based on the chirp multiple access interference, we can obtain multiple transmitted models of the chirp system for multiple access. To support both synchronous and asynchronous transmitted systems and to improve the performance of multiple access chirp systems, we propose a multiple access PSK-chirp (Phase Shift Keying chirp) system. The multiple access PSK-chirp system's transmitter and receiver are first described. Then, in order to enhance the system's performance, the channel estimation and demodulation method based on Fractional Fourier Transform (FrFT) at the receiver is improved. Finally, we simulate the performance comparison of the matched filtering method, the FrFT method, and the enhanced FrFT algorithm. It is seen that the performance of the improved algorithm may be increased by roughly 1 to 2.5 dB.