Low-complexity overhead and very small side information (SI) are virtues of the low peak-to-average-power ratio (PAPR) filter bank multicarrier [Low PAPR FBMC (LP-FBMC in short)], which has been recently proposed. However, the SI is an annoying burden because it needs a complicated system design, irrespective of its size. In this paper, we propose an SI-embedded LP-FBMC that does not separately transmit SI but embeds it in the transmitted signal in a specific way while preserving the PAPR and bit error rate (BER) performance. The approach is motivated by a property of the LP-FBMC where demodulation by even an incorrect SI does not change the signal constellation. We embed the SI in the intentional phase rotation of the constellation without additional energy or bandwidth. The phase rotation differs according to the SI and is common to all data symbols in each LP-FBMC subframe. In the receiver, we remove data symbol-dependent phase terms of the decision variables (DVs) by taking the fourth power and detect the SI embedded in the remaining phase term. Simulation results reveal that the BER of the SI-embedded LP-FBMC is almost the same as that of the perfect SI case when there are an acceptable number of data symbols for SI estimation. We also devised a complexity-reduced implementation for the additional processing required for the proposed SI embedding and detection schemes.

中文翻译：

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具有嵌入式边信息的基于 DFT 扩展的低 PAPR FBMC

低复杂度开销和非常小的边信息 (SI) 是最近提出的低峰均功率比 (PAPR) 滤波器组多载波 [低 PAPR FBMC（简称 LP-FBMC）] 的优点。然而，SI 是一个烦人的负担，因为它需要复杂的系统设计，无论其大小如何。在本文中，我们提出了一种 SI 嵌入式 LP-FBMC，它不单独传输 SI，而是以特定方式将其嵌入到传输信号中，同时保留 PAPR 和误码率 (BER) 性能。该方法的动机是 LP-FBMC 的一个特性，其中即使是不正确的 SI 解调也不会改变信号星座。我们将 SI 嵌入到星座的有意相位旋转中，而无需额外的能量或带宽。相位旋转根据 SI 不同并且对于每个 LP-FBMC 子帧中的所有数据符号都是通用的。在接收器中，我们通过取四次幂去除决策变量 (DV) 的数据符号相关相位项，并检测嵌入剩余相位项中的 SI。仿真结果表明，当存在可接受数量的用于 SI 估计的数据符号时，SI 嵌入式 LP-FBMC 的 BER 与完美 SI 情况下的 BER 几乎相同。我们还为提议的 SI 嵌入和检测方案所需的附加处理设计了一种降低复杂性的实现。仿真结果表明，当存在可接受数量的用于 SI 估计的数据符号时，SI 嵌入式 LP-FBMC 的 BER 与完美 SI 情况下的 BER 几乎相同。我们还为提议的 SI 嵌入和检测方案所需的附加处理设计了一种降低复杂性的实现。仿真结果表明，当存在可接受数量的用于 SI 估计的数据符号时，SI 嵌入式 LP-FBMC 的 BER 与完美 SI 情况下的 BER 几乎相同。我们还为提议的 SI 嵌入和检测方案所需的附加处理设计了一种降低复杂性的实现。