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.
Recently, wireless ad hoc communication systems have been receiving attention. In order to improve the efficiency of such networks, researchers have tried to apply adaptive array antennas (AAA) for interference cancellation in the space domain. In this paper, we propose a new method based on a new concept, called cross-degree of freedom (CDOF), for the application of AAA to ad hoc communications....
Frequency hopping (FH) has been employed by various wireless systems. For the reception of FH signals, first of all, it is necessary to detect the hopping timing for dehopping. However, it is not easy under low signal-to-noise power ratio (SNR) environment. On the other hand, adaptive array antenna (AAA) technique has been paid much attention. It enables us to improve SNR by beamforming for the direction...
A reflection current control type adaptive antenna was applied to receive high quality FM broadcasting at the running car. The CMA was used as the adaptable beamforming scheme and the direct-search-method was used as the heuristics of the reactance value. This paper presents the experimental production of the antenna and the field test result.
In cellular systems, hotspot communication can be established to support the high-traffic areas by using the same frequency band of the original cellular systems. However, interference from the hotspots deteriorates the communication performance of original cellular system. In this paper, in order to decrease these interference, we set up the access point of hotspots with the adaptive array antenna...
In this paper, we propose a new concept namely forward interference avoidance (FIA) using adaptive array antennas (AAAs) for wireless mobile ad hoc networks (MANETs). It enables nodes to avoid interfering with other nodes so that it results in increasing the number of co-existent wireless links. The performance improvement of MANET in terms of the increase of the number of co-existent communication...
This paper examines the packet transmission efficiency of the new reconfigurable adaptive array antennas (AAA) based on eigenvalue decomposition (EVD) applied to inter-vehicle communication network (IVCN) comparing with that of conventional minimum mean square error (MMSE)-based AAA. Due to the fact that the proposed method does not need preambles and exact synchronization, it has been verified that...
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.