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Due to the unreliable nature of wireless links, sensor nodes frequently encounter degraded performance or lack of connection. This paper provides a real-time status monitoring and channel error diagnosis method in a wireless sensor network. It uses a poll and echo procedure to efficiently collect some physical layer and link layer statistics from both transmitter side and receiver side. A machine...
In this paper, an improved power divider for 220GHz frequency band is presented. The power divider is based on the H-plane of rectangular waveguide and a T-shape configuration. The design principle and manufacture procedure for rectangular waveguide terahertz power divider well be introduced in the article, the model will be simulated by the software Ansoft HFSS and processed by machining. The obtained...
Internet of Things (IoT) has become a popular issue in academic research. The technology of Wireless Sensing Network can fully implement the concept of IoT. A WSN uses less expensive sensors to automatically monitor environmental factors and to transmit sensing data. Therefore, the cost of manually collecting sensing data can be largely reduced. WSNs are often deployed to an outdoor environment where...
This paper presents a 150-GHz push-push voltage-controlled oscillator (VCO) in 0.13-μm SiGe BiCMOS process. The VCO generates the D-band output signals from 147.4 to 152.4 GHz. At 150 GHz, the simulated phase noise at 1- and 10-MHz offset frequencies are respectively −67 dBc/Hz and −93.5 dBc/Hz and the simulated output power is −21 dBm with a 50 Ω load. The VCO draws a current of 3.93 mA from a 2...
Suitable mobility model is very essential for MANET algorithm performance evaluating. A mobility model which allocates destination for each mobile node and allows stochastic factor existing in the procedure of approaching destination is proposed. This model is used to evaluating the clustering overhead of MANET. Simulating results indicated that cluster routing is acceptable for application.
The closed-loop multiple-input multiple-output (C-MIMO) systems with feedback channel significantly improve performance of systems. There are many recent researches proposed space time block codes (STBCs) for closed-loop MIMO systems which have number of transmit antennas greater 2. However, to the best of our knowledge, the STBC for closed-loop MIMO systems with 2 transmit antennas is not available...
In order to achieve wireless energy transmission of artificial heart implemented in the body, a transcutaneous energy transmission system is designed using non-contact coupling to transfer power based on electromagnetic induction. Switch control circuitry is used in the system to convert external DC into high frequency AC (HFAC). The HFAC is coupled to the secondary circuit at the transcutaneous transformer,...
The total energy minimization in wireless multihop networks using two-way network coding is investigated in this paper. The problem is first formulated as a linear programming problem, then decomposed into two sub-problems using the La- grangian decomposition, and finally solved with the subgradient method. After that, the backpressure based algorithm is proposed to solve the problem in a distributed...
From capacity point of view, we show that cellular controlled short-range communication (CCSRC) systems can provide a significant gain over state-of-the-art cellular systems. In order to obtain such a gain and reduce the resultant complexity of communication link selection, a simple distance-based (DB) access criterion is proposed. Simulation results show that such a criterion is near optimal.
This paper presents a novel “Self-Powered Pipe Flow Metering System (SPPFM)” with the functions of measurement, analysis and display incorporated with self-powering. The features of vortex flow metering and pipe flow generator are adopted simultaneously to develop this integrated system.
On the basis of analyzing, comparing the routing protocol and learning from the advanced thinking, the author proposes the algorithm of wireless sensor network routing based on gradient and the residual energy ant algorithm. Using the character that ant algorithm is simple and easy to realize, works in the part, and it integrates link quality into pheromone and supports many links to design the wireless...
Fast handover protocol provides seamless handover in mobile IPv6 networks by reducing handover latency. One assumption in fast handover is that the MN (Mobile Node) or the network could know or predict the new AR (Access Router) before data transport from the previous AR to the MN is disrupted. In order to achieve this capability, the complexity of predicting the new AR and the diversity of the wireless...
This paper describes an on-line monitor system based on wireless sensor networks, which could test the ingredients of vehicles' off-gases, and also introduces the design of the hardware and software in details, and transplants the Zigbee protocol on the system at last. With the character of portability and the high precision gas sensors, the system could monitor the off-gases and distinguish the ingredients...
In order to ensure the quality of broadband service in cellular networks, bandwidth resources are required more and more. But the wireless bandwidth resources in a cell are limited and fixed. A QoS-adaptive bandwidth allocation scheme based on measurement report real-time analysis is presented in the paper. It makes use of the measurement report frames and normalized QoS level to maximize the weight...
Directional antennas can increase the spatial reuse of the wireless channels and reach a higher antenna gain. This paper presents the design, implementation and simulation results of a multi-channel medium access control protocols for high density vehicular ad hoc networks using directional antennas with local beam tables. Simulation shows that our protocol has a higher throughput than the existing...
Vehicular ad hoc network (VANET), a subclass of mobile ad hoc networks (MANETs), is a promising approach for future intelligent transportation system (ITS). Understanding and modeling packet error in the VANET is especially relevant to the design and analysis of higher layer wireless communication protocols. In this paper, the analysis of the packet error characteristics based on measurements in live...
This paper presents numerical examples that shows the results predicted by the RBF-NN models are consistent with those calculated from existing studies. It should be noted that the RBF-NN model is inherently one type of the general regression. This makes it powerful in modeling and predicting such a nonlinear problem. With the use of neural networks, the complex numerical computation about arrays...
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