In this paper, we propose a complex-valued symbol based FBMC/OQAM (C-FBMC/OQAM) system to achieve the self-cancellation of intrinsic imaginary interference. The key idea is the employment of a well-designed repeated frame, in which complex-valued QAM symbols are transmitted instead of only real-valued symbols in the classical FBMC/OQAM systems. It is proven that, intrinsic interference among symbols can be eliminated in the proposed C-FBMC/OQAM systems, and the spectral efficiency is maintained even in the existence of repeated frame. Simulation results shows that the proposed C-FBMC/OQAM system and preamble structures for channel estimation demonstrate improved robustness against frequency selective fading channels compared to conventional FBMC/OQAM systems due to the intrinsic interference cancellation.

中文翻译：

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帧重复：FBMC/OQAM 系统中虚干扰消除的解决方案

在本文中，我们提出了一种基于复值符号的 FBMC/OQAM (C-FBMC/OQAM) 系统，以实现对固有虚部干扰的自消除。关键思想是采用设计良好的重复帧，其中传输复值 QAM 符号，而不是传统 FBMC/OQAM 系统中仅传输实值符号。证明在所提出的C-FBMC/OQAM系统中可以消除符号之间的固有干扰，并且即使存在重复帧也能保持频谱效率。仿真结果表明，与传统的 FBMC/OQAM 系统相比，由于固有的干扰消除，所提出的 C-FBMC/OQAM 系统和用于信道估计的前导结构证明了对频率选择性衰落信道的改进鲁棒性。