说明：   <Blind phase recovery in general QAM communication systems using alternative higher order statistics> 作者是K.V.Cartwright。文中对以前Chen的算法进行了描述，在此基础上进行了改进。
( <Blind Phase recovery in general QAM communication systems using alternative higher order statistics> author is KVCartwright. Article on Chen s algorithm previously described, on the basis of improvements.)