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High throughput SDR networking waveforms require fast convergence Automatic Gain Control algorithms due to frequent transmissions in short time slots. In this paper, we propose a novel algorithm for feed-forward AGC with fast convergence and reduced computational complexity. Firstly, the RF front end of Software Defined Radio (SDR) is characterized through the use of vector signal generator. An RF...
Relay selection among available relays is crucial in improving the performance of cooperative relaying. In this paper, we address the relay selection for a multi-relay decode-and-forward (DF) cooperative relaying scheme over channels impaired by bursty impulsive noise in the presence of Rayleigh fading. For this scheme, we propose a novel best relay selection technique which is based on both the channel...
Wireless sensor network (WSN) is commonly used for localization analysis. Through sniffing receive signal strength indication (RSSI) in WSN system, localization of higher RSSI is connected automatically. This paper proposes the Raspberry-Pi (RasPi) based sensor node to sniffing RSSI and automatically connect the device to strongest RSSI. The RasPi brings the advantages of a personal computer (PC)...
Data offloading is an increasingly popular mechanism for meeting the rising demands of cellular users. In order to enable the small players, such as businesses and individual owners to make their services available to the bigger wireless service providers (WSPs) to help offload data, a simple, practical and easy-to-use payment machinery needs to be devised. Existing auction mechanisms usually assume...
We provide an improved bound for the expectation of the stationary delay under the maximum weight scheduling (MWS) policy in one-hop wireless networks. In the model, the interference of the links is characterized by an interference graph G=(V, E). For a vector μ ∊ R|V|+, let χf (G, μ) be the weighted fractional coloring number for the graph G under the weight vector μ. For an arrival rate vector λ...
Voice traffic termination fraud, often referred to as Subscriber Identity Module box (SIMbox) fraud, is a common illegal practice on mobile networks. As a result, cellular operators around the globe lose billions annually. Moreover, SIMboxes compromise the cellular network infrastructure by overloading local base stations serving these devices. This paper analyzes the fraudulent traffic from SIMboxes...
Multirate multicast improves user quality but complicates network optimization. This paper introduces a novel control scheme to dynamically optimize multirate multicast. We present MMT, an adaptive policy which combines differential backlog scheduling and intelligent packet dropping, both based on local information. MMT is shown to maximize network throughput by adapting to changing conditions such...
For wireless networks, coverage with different restrictions that can capture the practical requirements have received great research interests. We will study several restricted coverage problems. The first problem is about K-coverage, i.e., how to deploy wireless nodes such that each target is covered by at least K wireless nodes. We study the problem restricted to linear-A"-coverage where there...
In this paper, we develop a hierarchical Bayesian game framework for automated dynamic offset selection. Users compete to maximize their throughput by picking the best locally serving radio access network (RAN) with respect to their own measurement, their demand and a partial statistical channel state information (CSI) of other users. In particular, we investigate the properties of a Stackelberg game,...
This article presents the implementation of an Electroencephalogram — EEG system less susceptible to electromagnetic interference — EMI. The amplification, filtering and A/D conversion are placed directly over each electrode. Due to the local amplification and conversion, the system becomes more resilient to EMI and consequently the results are trustier. It was developed a central chip or hub that...
This paper presents a dependable visual controller for a small-scale helicopter with a wireless camera. The wireless camera sometimes captures noisy images caused by communication errors or swinging motion of the helicopter. If all captured images are used to generate feedback control signals, then the helicopter is out of control in our experiences. Noisy images are classified into three types. Three...
This paper reports the micro-power telemetry unit that can sense pressure, humidity, and bio-potentials, for the study of micro-package techniques for implantable biomedical micro-systems used in research, diagnosis and therapy. The micro-package study is aimed to develop and demonstrate the micro-package technology for micro-implants to have an implant life of 0.2 to 2.0 years. The telemetry device...
This paper presents the application of WLAN (Wireless Local Area Network) in networked DNC system. The networked DNC System has been built based on WLAN, and it mainly consists in computer, NC machine with RS232 interface, Network Interface Card as well as Wireless NIC. NC machine with RS232 interface is controlled by computer based on WLAN communication technology, and the Network Interface Card...
Over the past decade, wireless communications has seen an exponential growth and will certainly continue to witness spectacular developments due to the emergence of new interactive multimedia applications and highly integrated systems driven by the rapid growth in information services and microelectronic devices. So far, most of the current mobile systems are mainly targeted to voice communications...
Although the approaches about how to manifest the technology innovation could contribute to the development of innovative learning technologies, the neglect of teacherspsila individual differences in technology applications may interrupt the technology diffusion. In this paper two case studies about teaching with innovative learning technologies (including mobile learning environment and interactive...
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