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In this paper, we investigate the resource management and scheduling issues for the future UWB-based high-rate WPAN systems. Based on a distributed management architecture, we propose a novel multiple access scheme in the context of multiuser channel and time allocation for the UWB applications. Using a self-learning and managing approach, the distributed resource allocation is based on the exchange...
Medical images contain human body pictures and used widely in diagnosis and surgical purposes. Compression is needed for medical images for some applications such as profiling patient's data or transmission systems Due to the importance of the information of medical images, lossless or visually lossless compression preferred. Lossless compression mainly consists of transformation and encoding steps...
Team based subjects in Engineering occur within the School of Electrical, Computer and Telecommunications Engineering in second and third year undergraduate degrees. In such subjects, students work in teams of between five and ten students to propose and develop engineered products for a target market place (chosen from different themes) with a small budget allocated for purchasing materials and devices...
Network coding is a promising technique for improving system performance in wireless multihop networks. In this paper, the throughput and fairness in single-relay multiuser wireless networks are evaluated. The carrier sense multiple access with collision avoidance (CSMA/CA) protocol and network coding are used in the medium access control (MAC) sublayer in such networks. The fairness of wireless medium...
A society is typically driven by an economic model to manage demand, debt and distribution that is virtually analogous to the management of data, resources and routing in WSNs. In this paper, the application of such a socio-economic model is formalised as a framework to optimise resource utilisation and collaboration among sensor nodes. A specifically designed simulation platform (WSNSim) has been...
Regular broadband software radio receivers could not simultaneously satisfy the requirements for high power efficiency and high dynamic acquiring. This paper develops a real-time digital calibration system based on recursive least square algorithm. A blind identification criterion for the minimizing of the total energy of the nonlinear distortions in the compensated output is designed as the characteristic...
This paper proposes a medium access control (MAC) protocol with network coding on relay nodes for contention-based multihop wireless relay networks. The proposed protocol is called coded packet priority access (CPPA) protocol in which coded packets have higher transmission opportunity than non-coded native packets at relay nodes. In this paper, the performance of coded packet immediate access (CPIA)...
STBC-MIMO network coding with adaptive spatial modulation for the asymmetric channel and traffic is proposed in this paper. The proposed scheme can select the suitable modulation level every wireless link. In this paper, the throughput performance on the asymmetric channel of the proposed scheme are evaluated by computer simulation. As a result, it is shown that proposed the scheme is effective to...
In this paper, we consider a dual-hop regenerative relay system consisting of one source node, one destination node and multiple relay nodes. All nodes are equipped with a single antenna except the destination node. We discuss two different relay selection strategies: 1) selection of the best relay; and 2) selection of all reliable relays. We investigate the optimal power allocation (PA) and relay...
Future wireless networks are evolving towards a heterogeneous cooperative and cognitive architecture to support broadband communication needs of different types of traffic. Future wireless networks will allocate network resources based on cooperative techniques. Resource controllers will apply the cognitive principle to find out status of various networks. We propose a predictive resource allocation...
Recently the cost-benefits of automated sensing over traditional field surveys for population management of fauna has been recognised. Remote monitoring through automatic identification based on sensor networks has followed one of two approaches; using the sensor nodes to perform data analysis within the network or alternatively using the sensor network as a means for collecting data to be centrally...
Surveillance networks are of importance in tactical and civilian applications. In this work we present a scheduling algorithm for a time division multiplexing based medium access control protocol for such networks, which employ directional antennas. The scheduling algorithm uses the attributes of a multi hop clustering scheme also used to aggregate data from cluster clients to cluster heads. We evaluated...
An Ultra wideband (UWB) spatio-temporal channel sounder, employing an orthogonal frequency division multiplexing (OFDM) signal and a receiving virtual array antenna was prototyped and evaluated in a narrowband interference environment. Channel information of the OFDM signal was estimated from the measured data. Time of arrival (TOA) was calculated by correlating the received waveforms with a template...
Packet classification involving multiple fields is used in the area of network intrusion detection, as well as to provide quality of service and value-added network services. With the ever-increasing growth of the Internet and packet transfer rates, the number of rules needed to be handled simultaneously in support of these services has also increased. Field-Programmable Gate Arrays (FPGAs) provide...
In this paper we propose an efficient, low power algorithm and its co-designed VLSI architecture for fractional-pel motion estimation (FME) in H.264/AVC. Our fractional-pel motion estimator uses a simplified FIR filter for half-pel interpolation. Usage of this filter reduces the required number of computations and the memory size and bandwidth for half-pel interpolation. Our simulations compare our...
In this paper, we present a novel energy consumption analysis of the flow-specific Cooperative Wireless Sensor Network Medium Access Control (CWS-MAC) protocol utilizing a nine-state radio energy model that includes both steady state and transient state energy consumption behavior. CWS-MAC is a traffic-adaptive, energy-efficient medium access scheme that has been shown in the literature to outperform...
In this paper, we present a new method for the design of ergodic sum-of-sinusoids (SOS) simulation models for multiple uncorrelated Rayleigh fading channels. The method, which is intended for a special class of SOS models, known as sum-of-cisoids (SOC) models, can be used to generate an arbitrary number of uncorrelated Rayleigh fading waveforms with specified Doppler power spectral characteristics...
To shorten the time taken to restore an IP network after a failures, we previously proposed a proactive method that uses a localization algorithm to reduce the number of alternate routing tables in the past study. Although we showed that it shortened the restoration time from failures by switching the routing tables to alternate ones set up for handling the failures, deployability remained a problem...
The goal of a communication system is to optimally utilise the scarce spectrum and the energy required to transmit information while maintaining a specific quality of service. In this paper, it is proposed to communicate information by using new ternary line coders with code rates R = ½, 2/3 and ¾ as invented by Aygolu and Panayirci [1]. The encoding/decoding is based on the convolutional coding and...
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