High-order amplitude phase shift keying is adopted in the latest digital satellite broadcasting system,which presents new challenges to the design of a receiver demodulation scheme.This study focuses on the soft decision decoding algorithm.Traditionally,maximum likelihood soft decision based on log likelihood ratio estimation is often used as a decoding scheme.Accordingly,a soft decision algorithm based on hard decision boundary is designed and the corresponding soft decision estimation formula is derived.Numerical analytical results show that the proposed soft decision algorithm can improve the error performance of a system and substantially reduce the complexity of implementation.
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