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

Semidefinite Relaxation Based Blind Equalization using Constant Modulus Criterion