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.
Industrial wireless sensor networks adopt a hierarchical structure with large numbers of sensors and routers. Time Division Multiple Access (TDMA) is regarded as an efficient method to reduce the probability of confliction. In the intra-cluster part, the random color selection method is effective in reducing the retry times in an application. In the inter-cluster part, a quick assign algorithm and...
Frequency hopping is adopted by many protocols to improve the reliability and security because of the complex and hash environment of industrial wireless sensor networks. However, the performance of frequency hopping is closely related to the link characteristics. Through the measurement and analysis of the link characteristics in industrial environment, we found that the link is time-varying but...
Aiming at reducing the system complexity, raising communication rate and supporting CDMA based applications, a direct sequence spread spectrum based underwater acoustic communication system is proposed. BPSK/QPSK modulation is used. A RA coding scheme is adopted to reduce the BER. To reduce the phase-acquisition complexity of receiver, a carrier modulation method which lets spread-spectrum code and...
On the basis of the existing methods of point object generalization, and in view of the inadequacy of existing methods, a rough sets idea to resolve the problem of point object generalization is put forward. After analyzing the relationship between the classification thinking of rough sets and map generalization, the feasibility of using rough sets method to generalize point object in map is explained...
In embedded system, how to utilize the limited physical storage capacity for code parameters is a challenging problem. This paper proposes a dynamic programming based algorithm to solve this problem under DOCSIS standard. The algorithm is able to generate the best storage structure of parameters in terms of the width of the bus, the priority and least storage spaces of those parameters. The algorithm...
According to the characteristic of high reliable and low power periodical data collection on a large scale metallurgical industry wireless sensor network(WSN), we present a hybrid TDMA-FDMA MAC protocol ,this protocol depends on a cluster-based hierarchical topology and uses a synchronization mechanism with dynamic time-stamp adjusting. In this protocol, we use a one-off time-slot allocation TDMA...
In some civilian applications of wireless sensor networks, the sensing nodes is so far away from the base station that relaying nodes must be employed to forward data. Some relaying nodes use up their power early because they have heavier traffic load, which affects the network lifetime. This paper proposes the two-phase placement strategy of relaying nodes, which implements an even energy consumption...
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.