论文标题
使用实用的RF组件为全双工收音机取消模拟自我干预取消
Analog Self-Interference Cancellation with Practical RF Components for Full-Duplex Radios
论文作者
论文摘要
全双工无线电中的主要障碍之一是由于强大的自我干扰（SI），接收器上的类似物到数字转换器（ADC）饱和。为了解决这个问题，研究人员提出了两种不同类型的模拟自我干预取消（SIC）方法 - i）被动抑制和ii）SI的再生和辅导。对于后一种情况，可调的RF组件（例如多-TAP电路）会重现并减去Si。这种RF组件的分辨率构成了模拟SIC的关键因素。实际上，它们与SI模仿程度直接相关。模拟SIC的另一个主要问题是由于非线性畸变而对SI通道的不准确估计，该扭曲主要来自功率放大器（PA）。在本文中，我们得出了多-TAP电路的SIC性能的封闭式表达。我们考虑RF组件如何克服诸如数字控制衰减器，相移和PA之类的实际障碍。为了进行现实的性能分析，我们利用测得的PA特性并进行基于3D射线追踪的系统级吞吐量分析。我们的结果证实，RF组件的非理想性显着影响模拟SIC的性能。我们相信我们的研究提供了对实用全双工系统设计的见解。
One of the main obstacles in full-duplex radios is analog-to-digital converter (ADC) saturation on a receiver due to the strong self-interference (SI). To solve this issue, researchers have proposed two different types of analog self-interference cancellation (SIC) methods -- i) passive suppression and ii) regeneration-and-subtraction of SI. For the latter case, the tunable RF component, such as a multi-tap circuit, reproduces and subtracts the SI. The resolutions of such RF components constitute the key factor of the analog SIC. Indeed, they are directly related to how well the SI is imitated. Another major issue in analog SIC is the inaccurate estimation of the SI channel due to the nonlinear distortions, which mainly come from the power amplifier (PA). In this paper, we derive a closed-form expression for the SIC performance of the multi-tap circuit; we consider how the RF components must overcome such practical impairments as digitally-controlled attenuators, phase shifters, and PA. For a realistic performance analysis, we exploit the measured PA characteristics and carry out a 3D ray-tracing-based, system-level throughput analysis. Our results confirm that the non-idealities of the RF components significantly affect the analog SIC performance. We believe our study provides insight into the design of the practical full-duplex system.
