A method of quadrature digital modulation APSK — PAM

Resolution performances of remote sensing satellites is increasing, while allowed frequency band for data transmission is fixed as a design recommendation. Satellite to ground station link became a bottleneck and it's requested to overcame that limit. This paper presents a new flexible modulation scheme for a high-speed communication system with a high spectral efficiency (up to 24 bit/s/Hz) with optimal signal-to-noise ratio's distance to Shannon boundary and simple modulation/ demodulation principles.