Asymptotic expression for the equivocation probability of the NDA FF carrier synchroniser

Equivocation in nonlinear feedforward carrier synchronisers considerably degrades the symbol error rate performance. A simple asymptotic (high E_s/N₀) expression for the equivocation probability is derived for two types of averaging filter and general nonlinearity. The expression is proven accurate in the E_s/N₀ region of practical interest. The results extend previous work.