基于混频器谐波的抗干扰压缩感知接收机

W. Namgoong, M. Torlak
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引用次数: 4

摘要

在认知无线电(CRs)的许多现有工作中,潜在的假设是高性能CR接收器的可用性。设计一种能够在广谱范围内感知的高效宽带无线电具有挑战性,特别是因为高水平的集成度和低功耗对于在电池供电的移动系统中运行的CR系统至关重要。近年来,人们提出了基于压缩感知(CS)的感知策略,以期在最小的硬件开销下减少感知时间。然而,现有的CS接收机假定目标频率范围之外的信号能量可以忽略不计。不幸的是,在一个真实的系统中,这不是一个准确的假设。由于设计宽带和高阶滤波器的困难,带外干扰大部分未衰减,特别是那些靠近感兴趣频带边缘的干扰。现有CS接收器的问题是它们对这些带外干扰很敏感,这些干扰会在带内折叠并导致性能显著下降。本文提出了一种对实际操作场景中不可避免的带外干扰具有更强鲁棒性的CS接收机。在所提出的接收器中,多相时钟级联利用现代硬开关换向混频器的谐波将宽带信号折叠到基带。所提出的接收机与现有的多共集接收机相似,但没有折叠带外干扰。提出了混频器模块的一种可能的电路实现,并量化了电路非理想性的影响。即使在没有带外干扰的情况下,所提出的接收机也优于现有的CS接收机,因为与现有接收机不同,它不会将带外噪声底折叠为带内噪声底。在存在带外干扰的情况下,现有的CS接收器停止工作,而建议的接收器基本上不受影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interferer-Robust Compressed Sensing Receiver Based on Mixer Harmonics
The underlying assumption in much of the existing work on cognitive radios (CRs) has been the availability of a high-performance CR receiver. Designing an efficient wideband radio that can sense over a broad spectrum is challenging, especially since high-levels of integration and low power are essential for CR systems operating in battery-powered mobile systems. Recently, sensing strategies based on compressed sensing (CS) have been proposed to reduce the sensing time at minimal hardware overhead. Existing CS receivers, however, assume that the signal energy outside the frequency range of interest is negligible. In a real system, unfortunately, this is not an accurate assumption. Because of the difficulty of designing a wideband and high-order filter, the out-of-band interferers remain largely unattenuated, especially those near the edge of the frequency band of interest. The problem with existing CS receivers is that they are sensitive to these out-of-band interferers, which fold in-band and result in significant performance degradation. This paper presents a CS receiver that is more robust to out-of-band interferers, which are inevitably present in realistic operating scenarios. In the proposed receiver, a cascade of multi-phase clocks exploit the harmonics of modern hard-switching commutating mixers to fold the wideband signal to baseband. The proposed receiver is shown to be similar to existing multi-coset receiver but without the folding of the out-of-band interferers. A possible circuit realization of the mixer block is presented, and the effects of circuit non-idealities have been quantified. The proposed receiver outperforms existing CS receiver even in the absence of out-of-band interferers, because unlike existing receivers, it does not fold the out-of-band noise floor to in-band. In the presence of out-of-band interferers, existing CS receivers cease to function while the proposed receiver remains largely unaffected.
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