Optimal Design of APSK Constellation for Satellite Channel

To increase the capacity of satellite channel by high order modulation signal,the optimal design method for amplitude phase shift keying(APSK) constellation was put forward according to the rules of maximum minimum Euclidean distance and maximum average mutual information based on the characteristics given of APSK signal in this paper.The calculation equations for maximum minimum Euclidean distance of APSK and channel capacity that was suitable for various constellations were presented.The simulation results showed that the minimum Euclidean distance and channel capacity were dependent on relative radii and were independent of relative phase.The channel capacities of various APSK constellations with the same signal-to-noise ratio were very similar.The majority of the constellation optimization would be focused on their power efficiency.