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.
This paper explores the multi-frequency independent channel interference alignment (MFC-IA) system of 3 channels and 4 users, and single data stream transmit, i.e. (3×3,1)4 system. We derive the analytic solution for (3×3,1)4 MFC-IA system. Based on the analytic solution, an optimization problem is proposed aim at the optimal IA solution. Then based on such a math model, we propose a simulated annealing...
To overcome imperfection of exhaustive based beam searching scheme in IEEE 802.15.3c and IEEE 802.11ad and accelerate the beam training process, combined with the fast beam searching algorithm previously proposed, this paper proposed a beam codebook design scheme for phased array to not only satisfy the fast beam searching algorithm's demand, but also make good use of the advantage of the searching...
Topology of power line carrier network (PLCN) is complex, fast changeable and its channel is time-variant. To enhance the availability and effectiveness of network communication, a cluster based dynamic routing algorithm (CBDR) is proposed in the paper. The algorithm adopts clustering based on root tree and local traversal in order to construct and maintain the dynamic routes according to trees topology,...
In consideration of the overcrowded spectrum resource, it is of great importance to study the combination of the cognitive radio (CR) and ultra wideband impulse radio (UWB-IR). In the cognitive UWB scene, the UWB pulse is supposed to constantly change its spectrum according to the state of the primary users to mitigate the potential interference to these vulnerable wireless systems. Meanwhile, the...
The optimal number of cluster heads is an important parameter of wireless sensor network performance. Network nodes will consume more energy if the number of cluster heads is too much or too little. This paper focuses on novel calculation method for optimal number of cluster heads. Base on the analysis of LEACH energy dissipation model, novel calculation method is derived from the total energy dissipation...
UWB communication system operates by transmitting signals over a very wide band in spectrum, so there must be a coexistence problem between UWB and the other radio services. In order to investigate the interference to the narrowband wireless services from the UWB devices, a novel three-dimensional projection interference model has been presented. This analysis model is fit for analyzing the interfered...
Ultra-narrow-band communications system can greatly improve the spectrum utilization efficiency, therefore it will ease the tension of spectrum. Unfortunately, arguments from academia still focus on its principle as well as the realization. UNB transmission system based on the FIR filter has been explored in this paper. The characteristic of UNB signal after the FIR filter was analyzed. Then information...
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.