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Quantitative spectrum occupancy evaluation in China: based on a large scale concurrent spectrum measurement

The Journal of China Universities of Posts and Telecommunications 2012年第3期19卷 122-128页

作者： YIN Liang YIN Si-xing WANG Shuai ZHANG Er-qing HONG Wei-jun LI Shu-fang School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

Due to the usable frequency becomes more and more crowed, dynamic spectrum access （DSA） is a new hope to solve this problem. However, DSA in China requires a quantitative analysis of the current spectrum utilization in frequency, temporal and spatial domains. In order to free the precious spectrum, spectrum regulation organizations must have a clear, detailed, up-to-date understanding of where, how and by whom spectrum is currently being used--such data is essential to sound policy decisions in the context of cognitive radio （CR）. In this paper, a concurrent spectrum occupancy measurement in south China was conducted to evaluate the practical spectrum occupancy with a digital wideband receiver covering from 20 MHz to 3 GHz. We also propose systemic spectrum measurement methodology, matrix format data storage, duty cycle （DC） evaluation metric and data mining process which can be a guideline for other researchers when they conduct the similar experiments. Quantitative analysis and characterization of the 4 different measurement locations are evaluated to promote the popularization of CR application in China. And a uniform Beta distribution channel occupancy model is also validated using real-scene measurement data. The experimental results demonstrate that there is a significant scope for license-exemption use of the released spectrum using CR technology.

关键词： cognitive radio spectrum measurement spectrum occupancy duty cycle Beta distribution

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A digital energy spectroscopy based on FIR filter

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Science China(Technological Sciences) 2011年第1期54卷 251-254页

作者： XIE ShuXin LIANG Hao SUN Jian YU XiaoQi Department of Modern Physics University of Science and Technology of China Hefei 230026 China

We designed a universal digital energy spectroscopy based on online digital signal processing. A prototype system was built and tested. Signals from radiation detectors were processed via a digital filter whose coefficients could be modified without changing the hardware. The paper introduces the hardware design of the digital energy spectroscopy system as well as the full set of software consisting of the selection of the coefficients of the finite impulse response (FIR) filter and the coding in the field-programmable gate array (FPGA). The system was tested with the high purity germanium (HPGe) detector. The results showed that this prototype can achieve an energy resolution close to that of a traditional multi-channel analyzer (MCA) with a much higher counting rate.

关键词： digital energy spectroscopy FPGA FIR filter online digital processing spectrum measurement

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