Anton Paar啤酒分析仪快速、准确、操作简单,而且仪器在使用过程中有较高的稳定性,被国内外大中型啤酒生产厂家广泛采用.我们自1996年开始使用该仪器,结合仪器的使用说明,对仪器的维护保养总结出了一套行之有效的方法.现将使用AntonPaa...Anton Paar啤酒分析仪快速、准确、操作简单,而且仪器在使用过程中有较高的稳定性,被国内外大中型啤酒生产厂家广泛采用.我们自1996年开始使用该仪器,结合仪器的使用说明,对仪器的维护保养总结出了一套行之有效的方法.现将使用AntonPaar啤酒分析仪时维护保养工作的一点体会归纳如下,供业内同仁参考.展开更多
Spectrum sensing is the key problem for Cognitive Radio(CR) systems.A method based on the Peak-to-Average Amplitude-Ratio(PAAR) of the Spatial Spectrum(SS) of the received signals is proposed to sense the available sp...Spectrum sensing is the key problem for Cognitive Radio(CR) systems.A method based on the Peak-to-Average Amplitude-Ratio(PAAR) of the Spatial Spectrum(SS) of the received signals is proposed to sense the available spectrum for the cognitive users with the help of the multiple antennas at the receiver of the cognitive users.The greatest advantage of the new method is that it requires no information of the noise power and is free of the noise power uncertainty.Both the simulation and the analytical results show that the proposed method is robust to noise uncertainty,and greatly outperform the classical Energy Detector(ED) method.展开更多
基金Supported by the National Natural Science Foundation of China (No. 60602053)Program for New Century Excellent Talents in University (NCET-08-0891)+2 种基金the Natural Science Foundation of Shaanxi Province (2010JQ80241)the Natural Science Foundation of Hubei Province (2009 CDB308)the Fund from Education Department of Shaanxi Government (2010JK836)
文摘Spectrum sensing is the key problem for Cognitive Radio(CR) systems.A method based on the Peak-to-Average Amplitude-Ratio(PAAR) of the Spatial Spectrum(SS) of the received signals is proposed to sense the available spectrum for the cognitive users with the help of the multiple antennas at the receiver of the cognitive users.The greatest advantage of the new method is that it requires no information of the noise power and is free of the noise power uncertainty.Both the simulation and the analytical results show that the proposed method is robust to noise uncertainty,and greatly outperform the classical Energy Detector(ED) method.
