高性能多分辨率频谱感知电路研究

【作者】 闵卿；

【导师】 李宁；

【作者基本信息】 复旦大学 ， 微电子学与固体电子学， 2010， 硕士

【摘要】 随着社会的发展,频谱资源日趋紧张,与此对应的是实际的频谱利用率并不高。认知无线电能够充分利用空间中空闲频带作为通信所用的频率,其是解决频谱资源紧张,提高频谱利用率的重要技术。认知无线电需要频谱感知技术对空间频谱进行快速可靠的探测。本文系统总结了频谱感知面对的频谱机会,遭遇的问题与挑战,主流的频谱感知技术以融合多种技术,跨层次的系统解决方案。以频谱感知中的快速感知为切入点,重点研究应用于认知无线电快速感知的多分辨率频谱感知设计。论述多分辨率频谱感知的理论与实现,并研究其电路实现的关键技术。传统基于窗函数的多分辨率频谱感知方法的探测时间和探测频谱精度相互制约,我们针对这个缺点,在系统架构上予以改进：通过在窗函数相关前增加可重构滤波器进行预滤波,打破了探测时间和频谱分辨率的折中关系,增加探测精度,减少探测时间；并可以实现频谱分辨率的自由调节。该频谱感知模块设计采用TSMC0.13μm CMOS工艺,在1.2 V的电源电压下的功耗消耗为30 mW,有效面积为0.96mm2。芯片测试结果显示,设计实现-65dBm探测精度,31 dB动态范围,1 MHz至20 MHz的频谱分辨率选择,仅1μs的单点探测时间。该设计实现了对于频谱快速感知的功能。更多还原

【Abstract】 With the development of the society, the spectrum resource becomes more and more scarce. However the practical spectrum is not adequately utilized. Cognitive radio, which can take advantage of unused spectrum to transmit data, is an important technology to settle the problem of frequency resource shortage, and enhance the spectrum using rate. Spectrum sensing technology is required by cognitive radio to process quick and reliable detection on frequency spectrumIn this thesis, we summarize various facets of spectrum sensing include spectrum opportunity, problems and challenges, various spectrum sensing technology and systematic solution with multiple technology and cross-layer corporation. We put emphasis on the multi-resolution spectrum design application in cognitive radio fast sensing function. We discuss the basic theory and implementation of the multi-resolution spectrum sensing and also the key issues on circuit realization. A novel multi-resolution spectrum sensing circuit, to realize the spectrum sensing function in cognitive radio, with improved sensing time is proposed. Putting reconfigurable filter before the multiplier, this design breaks the tradeoff between sensing time and frequency resolution. In addition, the frequency resolution could be adjust freely by the reconfigurable filter.Implemented in 0.13μm CMOS process, the circuit operation at 1.2 V supply voltage dissipates 30mW of power with effective area 0.96mm2. Test results shows the spectrum resolution covers 1 MHz to 20 MHz; the sensing sensitivity achieve-65 dBm with 31 dB dynamic range; with only 1μs sensing time per frequency point. This design realize the function of fast spectrum sensing.更多还原