用于配备基于双工器的集成接收机的 SWIPT 的叠加 Chirp 波形
Superimposed Chirp Waveforms for SWIPT with Diplexer-based Integrated Receivers
AI总结：
提出用于 SWIPT 的叠加 chirp 波形与子带选择方案，并结合 DIR 接收机，推导平均收集能量闭式表达式，证明其在能量收集、多用户公平性和传输区域上的增益。
摘要：
本文提出将 chirp 波形叠加用于同步无线信息与功率传输（SWIPT）。利用 chirp 波形特性可叠加多个 chirp，从而在更少带宽上传输相同数量的波形，这使我们能在一组正交子带上工作时进行子带选择。此外，我们考虑配备基于双工器的集成接收机（DIR）的用户，该接收机能从同一信号中提取射频功率并解码信息，而无需进行信号分割。因此，结合 chirp 叠加与子带选择，本文提出一种传输方案，以同时利用二极管非线性和频率分集。基于顺序统计量工具，我们推导了通过在所选子带上传输叠加 chirp 所获得的平均收集能量（HE）的新型闭式解析表达式，并分析了用户端达到的下行信息速率。通过解析与数值结果，在所考虑的系统设置下，我们表明：与由一组固定频率余弦信号组成的多音波形相比，基于叠加 chirp 的 SWIPT 将平均 HE 性能提升了 30%；在多用户网络中提高了 HE 的最低水平；并且与固定频率波形相比扩展了能量传输的工作范围。此外，我们说明，与广泛采用的功率分割接收机相比，在 SWIPT 接收机中引入 DIR 可扩大能量-信息传输区域。
英文摘要：
In this paper, we present the superposition of chirp waveforms for simultaneous wireless information and power transfer (SWIPT) applications. Exploiting the chirp waveform characteristics enables us to superimpose multiple chirps, thereby allowing transmission of the same number of waveforms over less bandwidth. This enables us to perform subband selection when operating over set of orthogonal subbands. Furthermore, we consider a user equipped with a diplexer-based integrated receiver (DIR), which enables to extract radio frequency power and decode information from the same signal without splitting. Thereby, incorporating chirp superposition and subband selection, a transmission scheme is proposed to exploit both the diode's nonlinearity and frequency diversity. We derive novel closed-form analytical expressions of the average harvested energy (HE) via transmission of superimposed chirp over selected subbands based on tools from order statistics. We also analyze the downlink information rate achieved at the user. Through our analytical and numerical results, for the considered system setup, we show that superimposed chirp-based SWIPT provides an improvement of 30$\%$ in average HE performance as compared to multisine waveforms consisting of a set of fixed-frequency cosine signals, improves the minimum level of HE in a multiuser network, and extends the operating range of energy transfer as compared to fixed-frequency waveforms. Furthermore, we illustrate that the inclusion of DIR at the receiver for SWIPT enlarges the energy-information transfer region when compared to the widely considered power splitting receiver.
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