论文标题

通过Ambient OFDM的低功率物联网的环境范围的反向散射通信

Subcarrier-wise Backscatter Communications over Ambient OFDM for Low Power IoT

论文作者

Nemati, Mahyar, Soltani, Morteza, Ding, Jie, Choi, Jinho

论文摘要

最近已提出了有关低功率互联网应用程序(IoT)应用程序的一种吸引人的技术,环境反向散射通信(AMBC)最近提出了一种具有吸引力的技术。 OFDM信号的特殊频谱结构在比特率(BER)性能,数据速率和功耗方面提供了一系列灵活性。在本文中,我们研究了通过环境OFDM信号的子载波的反向散射通信。这个新的AMBC是利用OFDM的特殊频谱结构来传输数据,以挤压正交子载波。与现有方法相比,我们提出了一种基础传输方案及其两种修改,以支持更高的数据速率。基础方案可以使用频域中的ON-OFF键控(OOK)调制来传输每个子载波。在第一个修改中,采用交错的子载波块传输模型来改善系统在频率频道中的BER性能。它导致块大小和数据速率之间的权衡。因此,在第二次修改中,采用交织的索引调制(IM)来减轻以前修改的数据速率降低。它还可以稳定并控制信号的功率,从而导致遗产接收器的干扰减少。分析和数值评估提供了证明,以查看所提出的方法的性能,从BER,数据速率和干扰方面。

Ambient backscatter communication (AmBC) over orthogonal-frequency-division-multiplexing (OFDM) signals has recently been proposed as an appealing technique for low power Internet-of-Things (IoT) applications. The special spectrum structure of OFDM signals provides a range of flexibility in terms of bit-error-rate (BER) performance, data rate, and power consumption. In this paper, we study subcarrier-wise backscatter communication over ambient OFDM signals. This new AmBC is to exploit the special spectrum structure of OFDM to transmit data over its squeezed orthogonal subcarriers. We propose a basis transmission scheme and its two modifications to support a higher data rate with superior BER performance compared to existing methods. The basis scheme can transmit one bit per subcarrier using on-off keying (OOK) modulation in the frequency domain. In the first modification, interleaved subcarrier block transmission model is employed to improve the BER performance of the system in frequency-selective channels. It results in a trade-off between the size of the blocks and data rate. Thus, in the second modification, interleaved index modulation (IM) is employed to mitigate the data rate decrementation of the former modification. It also stabilizes and controls the power of the signal to result in interference reduction for a legacy receiver. Analytical and numerical evaluations provide a proof to see the performance of the proposed method in terms of BER, data rate, and interference.

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