Harmonics-Controlled Frequency Division Multiple Access without Harmonics and Sidebands Interference in Backscatter Communications
Harmonics-Controlled Frequency Division Multiple Access without Harmonics and Sidebands Interference in Backscatter Communications
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DOI：
10.1109/icc45855.2022.9838786
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发表时间：
2022-05
期刊：
影响因子：
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通讯作者：
Y. Konishi;S. Ibi;Kazuhiro Kizaki;T. Fujihashi;Takashi Watanabe;S. Saruwatari
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文献类型：
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作者：
Y. Konishi;S. Ibi;Kazuhiro Kizaki;T. Fujihashi;Takashi Watanabe;S. Saruwatari
在反向散射通信中，数据传输的功耗高达1/1000，而不是典型的几十毫瓦。然而，如果在相同空间中存在用于反向散射通信的多个节点，则谐波和边带限制复用节点的数量。通过在多个步骤中切换阻抗或生成具有相反相位的信号来抑制这两者;然而，这些方法增加了反向散射标签的硬件成本。本文提出了谐波控制的频分多址（HC-FDMA），它允许在反向散射通信中的多址干扰，而无需硬件修改。HC-FDMA由两个模块组成：调制方案和信道选择算法。该调制方案使用双稳态调制将谐波控制到任意信道。信道选择算法优化信号分量、谐波和边带的频率。以IEEE 802.15.4兼容的反向散射为目标，与没有HC-FDMA的情况相比，使用HC-FDMA的反向散射通信实现了1.45倍的复用。此外，分析结果表征HC-FDMA的能力。
In backscatter communications, data is transmitted with up to 1/1000 of the power consumption, instead of the typical several tens of milliwatts. However, if there are multiple nodes for backscatter communication in the same space, harmonics and sidebands limit the number of multiplexing nodes. Both are suppressed by switching the impedance in multiple steps or generating the signal with opposite phases; however, these methods increase the hardware cost of the backscatter tag. This paper proposes harmonics-controlled frequency division multiple access (HC-FDMA), which allows multiple access interference in backscatter communications without hardware modification. HC-FDMA consists of two modules: a modulation scheme and a channel selection algorithm. The modulation scheme controls the harmonics to an arbitrary channel using ∆Σ modulation. The channel selection algorithm optimizes the frequencies of the signal component, harmonics, and sidebands. Targeting IEEE 802.15.4-compatible backscatter, backscatter communication using HC-FDMA achieves 1.45 times multiplexing compared to the case without HC-FDMA. In addition, the analysis results characterize the capability of HC-FDMA.