Chaotic Orthogonal Code-Division Multiplexing (OCDM) is a method of encoding digital data on multiple chaotic codes. More than ten years after its introduction, the Chaotic OCDM method is now a mature technology that has been adopted in long-range underwater acoustic communications systems. This paper presents an overview of this method and its applications. Firstly, we review the major evolutions of this method with an emphasis on some key technologies such as the paralleled M-ary mode and the constant envelope multi-signal synthesizing method. A sea test corresponding to these technologies is introduced thereafter. Finally, we make a conclusion and propose future research directions in this field.
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