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A method of constellation blind detection for spectrum efficiency enhancement

Modulation classification is a technique to achieve blind estimation of modulation types. Thereby, signaling overhead can be reduced or equivalently spectrum efficiency can be improved. However, the benefit is limited in coded systems, since the code rate information have to be signaled anyway. To fulfill the requirement of higher spectrum efficiency in 5th generation (5G) systems, a method of constellation blind detection is proposed in this paper. By performing rotation and interleaving onto normal constellations, a new shape of constellation is created, and it can be distinguished from the normal constellation by blind detection at the receiver side. The advantage of the proposed method is twofold. Firstly, additional information bits can be carried by blind detection and thus enhancing spectrum efficiency. Secondly, constellation rotation can provide diversity gain. Simulation results have verified the effectiveness of our proposed method.