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The method of dynamic power management on wireless remote collector is presented in this paper, and the probability distribution of the collector is induced when different working states transfer. The energy change of the collector is analyzed in the procedure of working-mode transferring at consistent idle time length. As the working-mode of the collector is determined according to actual monitor...
In the context of wireless communications, power amplifiers raise a number of issues. Mastering the linearity vs. efficiency trade-off is not trivial. Switch-mode power amplifiers can provide high power efficiency. However, they exhibit significant nonlinearities, which make them difficult to apply in modern high linear modulation wireless systems. In order to enable their use in such systems, a LUT-based...
Cognitive Radio Networks (CRNs) are composed of frequency-agile radio devices that allow licensed (primary) and unlicensed (secondary) users to coexist, where secondary users opportunistically access channels without interfering with the operation of primary ones. From the perspective of secondary users, spectrum availability is a time varying network resource over which multi-hop end-to-end connections...
We analyzed the requirement of MAC protocol in coal mine, and proposed an improved 802.11 protocol which can adopt RTS/CTS mechanism or not adaptively. This protocol switch the status of RTS/CTS mechanism by comparing the optimal switch value of collision probability with real-time collision probability. The computing formula of switch threshold was given. Simulations show that the adaptive RTS adjustment...
In order to solve the problem of short continuous driving mileage and long charging time of electric vehicle (EV), the method of auto and rapid exchange system of EV battery cases is proposed. The exchange system deals with corresponding control of multi-components which are relatively moving each other. Based on single chip wireless transceiver nRF905 and MC68HC908GZ16, the wireless communication...
For the last decade, Voice Over IP (VoIP) has been a great concern leading to consider it as the ldquokilling applicationrdquo. Deploying such applications in the Wireless Local Area Networks (WLAN) is still in progress, and further investigations are needed. Unlike wired networks, wireless networks such as WLAN, have their own characteristics, which introduce many challenges that prohibit the support...
In this paper, the time modulation technique is extended to circular antenna arrays. The TMSA is adopted to synthesize a flat-topped pattern and scanning sum beams with lower amplitude excitation dynamic-range ratios or even uniform amplitude excitations, as compared to those of the CSA. The studies show that TMCA is a promising approach in synthesizing flat-topped pattern or scanning sum patterns...
In this paper, an innovative approach for the reduction of the sideband level in time-modulated linear array has been presented. First, the proposed strategy has been mathematically justified showing that the SBL can be lowered by modifying the switch-on instants. Accordingly, a PSO has been used to minimize a suitable cost function quantifying the mismatch between the actual pattern features and...
The present paper presents considerations on using a low power routing solution for prolonging the battery life for motes within a wireless sensor network (WSN) without affecting the network connectivity. The solution applies for the cases when, the distances between motes and base stations are over the mote's communication range, and motes located between sinks and base station are commonly used...
In the last couple of year's computer based home control systems are getting more and more common in modern homes. For instance these systems take care of light control, heat control and security systems. The latest trend is to use wireless communication like Z-Wave and ZigBee to interconnect different components in these systems. One of the characteristics is that each system, like for instance heat...
The level crossing rate, the outage probability and the average time of fade duration of the Switch and Stay Combiner output signal, in the presence of Rice fading at the input, are determined in this paper. The results are shown graphically for different variance values, decision threshold values and signal and fading parameters values.
Reaching consensus on a self-organized wireless sensor networks through totally decentralized algorithms is a topic that has attracted considerable attention. The average consensus method is the most popular algorithm used in this kind of applications. The main advantage of these approaches is that the network does not involve a fusion center to organize nodes. Using a realistic environment to check...
Recently, WiBro has been developed to efficiently support broadcasting via wireless network. MBS (multicast broadcast service) based on WiBro has numerous applications including DMB. Since the current MBS implementation uses only common channel which is managed by scheduling, it cannot effectively support many users requesting the service at the same time. This paper proposes a new counting scheme...
Traditionally, service providers have been adding Mobile Switching Centers (MSCs) in their wireless networks whenever they run out of capacity. In an analysis of a large metropolitan network, we observed something seemingly counter-intuitive: additional MSCs do not necessarily add call capacity and they can sometimes even cause decreased network capacity. The apparent anomaly can be intuitively explained...
In the two-phase handoff protocol, although Phase II gives an optimal path, it may result an additional cost. A tradeoff between achieving optimal path and reducing the cost is an important issue. In this paper, the effect of network conditions on the expected cost at the conventional path optimization policies is studied. We show that none of the existing conventional path optimization policies is...
Notice of Violation of IEEE Publication Principles"Application of Markov Chain in IP Traffic Classification,"by Zhou Xusheng and Wang Zhimingin the Proceedings of the International Conference on Networks Security, Wireless Communications and Trusted Computing, 2009. NSWCTC '09. , vol.2, pp.688-691, April 2009After careful and considered review of the content and authorship of this paper...
For the first time a reconfigurable top loaded monopole antenna is proposed for use in multiband wireless applications. It was designed and verified for operation across the frequency range from 1.8 GHz to 4.6 GHz using a simple switching approach. To further increase the tuning range of the antenna, higher order space-filling curve could be used.
We have designed and implemented a ZigBee light switch system with user- friendly operations. The system can be easily deployed, in the form of DIY, in the application of wireless automation control. The paper must be written in English and cannot exceed 4 pages, including authors' (author's) names and affiliations, text/equations, references, acknowledgements, and figures. It should be written in...
We consider a queueing network in which there are constraints on which queues may be served simultaneously. Such networks, called ldquoswitched networksrdquo [3] can be used to model input-queued switches, wireless networks, or bandwidth sharing in the Internet. The scheduling algorithm for such a network specifies which queues to serve at any point in time. The performance of scheduling algorithm...
Rapid prototyping allows for evaluation of design product in a short period of time. Designers or CEOs may perceive the size and appearance of the product by touching the automatically constructed physical objects produced through rapid prototyping. However, it is usually impossible to change its color, texture, and user interface. In this paper, we introduce 'Augmented Reality based Re-formable Mock-up',...
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