In filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) systems, a large pilot overhead is required due to the existence of the imaginary interference. In this paper, we present an approach to reduce the pilot overhead of channel estimation. A part of pilot overhead is used for transmitting data, and compensating symbols are required and designed to remove the imaginary interference. It is worthwhile to point out that the power of compensating symbols can be helpful for data recovery; hence, the proposed approach decreases the overhead of pilots significantly without the cost of additional pilot energy. In addition, the proposed scheme is extended into multiple input multiple output systems without the performance loss. Compared with the conventional preamble consisting of columns symbols, the pilot overhead is equivalent to column symbols in the proposed preamble. To verify the proposed preamble, numerical simulations are carried out with respects to bit error ratio.

中文翻译：

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FBMC / OQAM系统中具有低导频开销的信道估计方法

在具有偏移正交幅度调制（FBMC / OQAM）系统的滤波器组多载波中，由于存在虚干扰，因此需要较大的导频开销。在本文中，我们提出了一种减少信道估计的导频开销的方法。导频开销的一部分用于传输数据，并且需要补偿符号并将其设计为消除虚干扰。值得指出的是，补偿符号的功能可以帮助恢复数据。因此，所提出的方法显着减少了飞行员的开销，而没有额外的飞行员能量的成本。另外，所提出的方案被扩展到多输入多输出系统而没有性能损失。与常规序言相比在列符号中，导频开销等同于所提出的前导中的列符号。为了验证提出的前同步码，就误码率进行了数值模拟。