Trellis design of APSK in satellite broadcasting

Amplitude phase-shift keying (APSK), especially 16APSK and 32APSK modulations, have been efficiently applied into satellite broadcasting and communications, such as DVB-S2, which endows the system with high spectrum efficiency and transmission rate. However, fewer design about the trellis coding and modulation based on APSK has been reported so far. In this paper, the symmetric and asymmetric TCM for 16APSK and 32APSK have been proposed and investigated. The proposed symmetric scheme has been proved more than 2dB gain in AWGN channel compared with the relatively low modulation schemes, e.g. 8PSK vs. 16APSK and 16APSK vs. 32APSK, which can be considered as a good alternative if the system works beneath the demodulation threshold of the relatively low modulation schemes. Moreover, the asymmetric TCM scheme is proposed in fading channel to achieve additional more than 1dB gain.