基于多天线的认知无线电网络位时空宽带传感

J. M. Duncan, S. Sharma, S. Chatzinotas, B. Ottersten, Xianbin Wang
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引用次数: 1

摘要

认知无线电通信被认为是实现下一代无线网络动态频谱共享的有前途的技术之一。在几种可能的使能技术中,频谱感知(SS)是实现CR网络(CRN)中机会频谱接入的关键技术之一。从实际应用的角度来看,设计具有合理采样率的低分辨率模数转换器(ADC)的低复杂度宽带CR接收机非常重要。在此背景下,本文提出了一种新的时空宽带SS技术,该技术通过在CR节点采用多天线和1位量化,从而能够使用合理的采样率。在我们的分析中,我们表明,对于相同的传感性能要求,所提出的宽带接收器可以比配备单天线和高分辨率ADC的传统CR接收器具有更低的功耗。此外,所提出的技术通过估计主用户(PU)信号的到达方向来利用空间维度,这是传统SS方法无法实现的,并且在CRN中具有显著的优势。此外,我们还评估了该技术的性能,并借助数值结果分析了比特量化的效果。
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Multi-antenna based one-bit spatio-temporal wideband sensing for cognitive radio networks
Cognitive Radio (CR) communication has been considered as one of the promising technologies to enable dynamic spectrum sharing in the next generation of wireless networks. Among several possible enabling techniques, Spectrum Sensing (SS) is one of the key aspects for enabling opportunistic spectrum access in CR Networks (CRN). From practical perspectives, it is important to design low-complexity wideband CR receiver having low resolution Analog to Digital Converter (ADC) working at a reasonable sampling rate. In this context, this paper proposes a novel spatio-temporal wideband SS technique by employing multiple antennas and one-bit quantization at the CR node, which subsequently enables the use of a reasonable sampling rate. In our analysis, we show that for the same sensing performance requirements, the proposed wideband receiver can have lower power consumption than the conventional CR receiver equipped with a single-antenna and a high-resolution ADC. Furthermore, the proposed technique exploits the spatial dimension by estimating the direction of arrival of Primary User (PU) signals, which is not possible by the conventional SS methods and can be of a significant benefit in a CRN. Moreover, we evaluate the performance of the proposed technique and analyze the effects of one-bit quantization with the help of numerical results.
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