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2ASK- 同 步 检 波vkTs ( )⎧a+ni, "1"= ⎨⎩ ni,"0"12 2f1( x) = exp( −( x−a) /2 δn)2πδ1f x x2πδn2 20( ) = exp( − /2 δn)n2011-9-11 56