  Blind equalization is a classic yet open problem. Statistic-based algorithms,
such as constant modulus (CM), were widely investigated. One inherent issue
with blind algorithms is the phase ambiguity of equalized signals. In this
letter, we propose a novel scheme based on CM criterion and take advantage of
the asymmetric property in a class of LDPC codes to resolve the phase
ambiguity. Specifically, a new formulation with modified CM objective function
and relaxed code constraints is presented.
