## 4 Semi-Blind Receiver
2016 YFB0502001), and the Fundamental Research Funds for the Central Universities (Nos. CUC18A007, 2018 CUCTJ082, 3132018 XNG1808). The authors would like to thank the anonymous reviewers and the editor for their careful reviews and constructive suggestions to help us improve the quality of this paper. The authors declare no conflict of interest. ## References

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