Research on onboard multistage digital demultiplexer for satellite communication based on MF-TDMA system

Abstract A new multicarrier multi-rate digital demultiplexer system structure based on MF-TDMA(Multi-Frequency Time Division Multiple Access) in a wideband satellite communication is described. Compared with the traditional tree method, uses half-band filter instead of quadrature mirror filter, which has three advantages: 1) It fully avoids shortcomings such as confusion distortion and amplitude distortion. 2) The computation to achieve filtering reduced by nearly half. 3) effectively improves demodulation performance system. In this paper, performs multistage MF-TDMA signal. results show no obvious signal distortion, demultiplexed structure. bit error rate demodulated better than that single carrier demodulator. very close theoretical value QPSK demodulation.