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Low cost, faster detection of cognitive radio through filter banks with bandpass sampling

机译：通过带通采样的滤波器组，低成本，更快地检测认知无线电

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摘要

In cognitive radio communication systems, fast and reliable detection of the idle channels which are not occupied by the primary users is the most fundamental requirement. In this paper, we first review some of the classical designs of cognitive radio receiver architectures and then propose a new solution using filter banks with the bandpass sampling technique. In conventional heterodyne receiver, a low rate analog to digital convertor (ADC) is used, which contains an analog bandpass filter. This results in a barrier in lowering detection time as significant time is used in the scanning operation. While the homodyne receiver has the capability of fast detection due to the use of high rate ADC, this is an unfeasible or very costly approach. Compressive sensing based receiver architectures are proposed in recent years, however those receivers do not work efficiently under the condition when the spectrum is congested and the number of channels are increased. In this work, we propose a filter banks based receiver with bandpass sampling architecture capable of fast detection and using a low rate ADC as well. In addition, comparative analysis of classical designs and the proposed architecture is carried out by considering performance parameters of detection time, signal to noise ratio and complexity of the receivers. (C) 2019 Elsevier B.V. All rights reserved.
机译：在认知无线电通信系统中，最基本的要求是快速可靠地检测未被主要用户占用的空闲信道。在本文中，我们首先回顾了认知无线电接收器体系结构的一些经典设计，然后提出了一种通过带通采样技术使用滤波器组的新解决方案。在传统的外差式接收机中，使用了低速模数转换器（ADC），其中包含一个模拟带通滤波器。由于在扫描操作中使用了大量时间，因此这会导致降低检测时间的障碍。尽管由于使用高速率ADC，零差接收器具有快速检测的能力，但这是不可行或非常昂贵的方法。近年来提出了基于压缩感测的接收器体系结构，但是，在频谱拥塞并且信道数量增加的情况下，那些接收器不能有效地工作。在这项工作中，我们提出了一种基于滤波器组的接收器，该接收器具有带通采样架构，能够快速检测并使用低速率ADC。另外，通过考虑检测时间，信噪比和接收机复杂度的性能参数，对经典设计和所提出的架构进行了比较分析。 （C）2019 Elsevier B.V.保留所有权利。

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