The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Solar diffuse radiation data is one of the most important parameters for assessing solar energy resource and designing grid connected photovoltaic system, due to the characteristics of ground solar radiation change significantly in recent years, previous solar beam-diffuse radiation separated model has been unable to true reflect the variation of solar radiation. A method for estimating diffuse radiation...
This study presents a method as a method for predicting the output of photovoltaic power station using a combination forecasting model based on IOWA operator. The prediction experiment is conducted based on the operational data of 18kWp grid-connected PV plant in the Power Electronics Research Center of Huazhong University of Science and Technology. In this method, firstly, we employ the grey relational...
This paper presents an efficient search algorithm utilizes the relationship between local motion similarity and the variation degree of motion vector. The main feature of proposed algorithm are: the motion vectors are classified as the unchanged, the slightly changed and the greatly changed motion vector according to corresponding local motion similarity; then different search schemes are adopted...
From the historical development of wireless communication technologies and radio spectrum resources regulation, the relationship between open spectrum movement and some new wireless communication technologies, such as UWB in China is discussed in the paper. Some UWB research works from our laboratory is also summarized. It can be concluded that the age of radio revolution, unlicensed and singular...
The potential interference of ultra wideband (UWB) on existing narrowband wireless communication systems must be analyzed before it is applied, so the paper uses a method based on the physical layer model to analyze the compatibility of direct-sequence ultra wideband (DS-UWB) and multi-band ultra wideband (MB-UWB) on several narrowband victim systems. Based on the physical layer models of PAM-DS-UWB...
Aiming at the effect of ultra wideband (UWB) system for the potential victim systems on UWB operating frequency band, using the entire physical layer model method, this paper studies the interference of direct-sequence ultra wideband (DS-UWB) and multi-band ultra wideband (MB-UWB) on these victim systems. Depended on the physical characteristics of UWB and these victim systems, the entire physical...
The article abstractly describes some points of methods on further improving of the spectrum efficiency. At first, the author introduces the current challenges facing spectrum management, spectrum circumstance and the traditional regulatory framework of doing this in China. Then the importance of raising the spectrum efficiency and some technical methods are analyzed in the article. The strategy of...
This paper is geared to the research focus of electromagnetic compatibility (EMC) problems between ultra wideband (UWB) and other radios suggested by ITU. First, the reliabilities of several airborne radio receivers in the presence of time hopping pulse position modulation UWB (TH-PPM UWB) interference are analyzed quantitatively from the aspect of power spectrum. Second, the mathematical expressions...
Ultra wideband system (1MB) is characteristic of the wide bandwidth, and it, may cause some harmful interference to existing users of the same and nearby bands. So it is impending for us to research on the spectrum management and usage of UWB system aiming at the way it using spectrum as early as possible. In this paper, we are presenting a new method for UWB system to share spectrum with other wireless...
Generally speaking, the article abstractly describes some points of view on further improving of the spectrum efficiency. At first, the author- introduces the current spectrum circumstance and the traditional method of doing this in China. Then the importance of raising the spectrum efficiency and some technical methods are analyzed in the article. The strategy of the spectrum management and the spectrum-sharing...
This article describes the changes in spectrum management, driven by modern communications system concepts and new-type RF hardware and software developments, briefly discusses strategy of the spectrum management in the future, including spectrum-sharing technology, multi-dimension frequency assignments, and dynamically allocated frequency assignments spectrum concept. This article draws the following...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.