Study on Set Partitioning 64APSK Coded Modulation Design Method Based on Channel Capacity.

We are researching set partitioning 64APSK coded modulation for satellite transmission. We previously developed a constellation- design method based on channel capacity [6] and evaluated the transmission performance under the condition that the constellation was restricted to circumferential arrangement [4]. We confirmed that this conventional method exhibited better transmission performance than DVB-S2X [7]. In this paper, we expanded the numbers of circle of 64APSK from four to seven. Especially, applying the number of five shows good channel capacity. We also applied the design scheme whose constellation points-assignment is not restricted to circumferential arrangement because of the free constellation points-assignment in the IQ plane. We show that the proposed 64APSK applying these design schemes achieved better transmission performance than conventional method through computer simulation under the AWGN model.