Design of a Single Channel Modulated Wideband Converter for Wideband Spectrum Sensing: Theory, Architecture and Hardware Implementation.
Design of a Single Channel Modulated Wideband Converter for Wideband Spectrum Sensing: Theory, Architecture and Hardware Implementation.
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DOI：
10.3390/s17051035
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发表时间：
2017-05-04
期刊：
影响因子：
--
通讯作者：
Sun W
中科院分区：
文献类型：
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作者：
Liu W;Huang Z;Wang X;Sun W
在认知无线电传感器网络中，宽带频谱感知设备具有重要的意义，其目的是尽快有效地利用暂时空闲的频谱间隔。然而，越来越高的信号频率和宽带宽的挑战需要极高的采样速率，这可能超过当今最好的模数转换器（ADC）前端带宽。最近，新提出的被称为调制宽带转换器（MWC）的架构，是一种有吸引力的模拟压缩传感技术，可以大大降低采样率。然而，MWC具有高的硬件复杂度，由于其并行通道结构，特别是当信号的数量增加。本文提出了一种单通道调制宽带转换器（SCMWC）方案，用于带限宽平稳（WSS）信号的频谱感知。该方案只需一根天线或一个传感器，不仅节省了采样速率，而且降低了硬件复杂度。然后，我们提出了一个新的，SCMWC为基础的，单节点CR原型系统，频谱感知算法进行了测试。我们的硬件原型上的实验表明，所提出的架构导致成功的频谱感知。总的采样率以及硬件尺寸仅为一个通道的MWC消耗。
In a cognitive radio sensor network (CRSN), wideband spectrum sensing devices which aims to effectively exploit temporarily vacant spectrum intervals as soon as possible are of great importance. However, the challenge of increasingly high signal frequency and wide bandwidth requires an extremely high sampling rate which may exceed today’s best analog-to-digital converters (ADCs) front-end bandwidth. Recently, the newly proposed architecture called modulated wideband converter (MWC), is an attractive analog compressed sensing technique that can highly reduce the sampling rate. However, the MWC has high hardware complexity owing to its parallel channel structure especially when the number of signals increases. In this paper, we propose a single channel modulated wideband converter (SCMWC) scheme for spectrum sensing of band-limited wide-sense stationary (WSS) signals. With one antenna or sensor, this scheme can save not only sampling rate but also hardware complexity. We then present a new, SCMWC based, single node CR prototype System, on which the spectrum sensing algorithm was tested. Experiments on our hardware prototype show that the proposed architecture leads to successful spectrum sensing. And the total sampling rate as well as hardware size is only one channel’s consumption of MWC.