Abstract Wireless mesh networks (WMNs) offer dependable and scalable solutions for services utilizing large bandwidth. Enhancement in the deployed number of applications based on wireless mesh networks necessitated a corresponding increased demand for higher bandwidth. This paper proposes a framework for effective management of bandwidth in WMNs making use of the concepts of cross layer design and ant colony methods.... Wireless mesh networks (WMNs) offer dependable and scalable solutions for services utilizing large bandwidth. Enhancement in the deployed number of applications based on wireless mesh networks necessitated a corresponding increased demand for higher bandwidth. This paper proposes a framework for effective management of bandwidth in WMNs making use of the concepts of cross layer design and ant colony methods. Read More Read Less

Abstract Service providers such as an Autonomous System (AS) are controlled by a network overlaid on top of the underlying network which aims to optimize a certain metric value, reduce cost, and increase the performance or efficiency of network traffic flow. Normally, the service gateways are placed on the boundaries of an AS for all inter-domain traffic to pass through to... Service providers such as an Autonomous System (AS) are controlled by a network overlaid on top of the underlying network which aims to optimize a certain metric value, reduce cost, and increase the performance or efficiency of network traffic flow. Normally, the service gateways are placed on the boundaries of an AS for all inter-domain traffic to pass through to extra domain networks. In cases where the time constraint is crucial as in interactive traffic flow transmissions, the service gateways have more impact on the performance. So that end-to-end paths have to pass, at least, one of the service gateway locations to carry the traffic flows from source to the destination. Traffic Engineering requires efficient tools to optimize network performance and traffic delivery. This paper covers the canalization of performance problems found in IP networks, to maximize the admitted traffic flow transmission without delay violations. The solution approach can be divided into two sub-problems. The first applies the placement algorithms to determine the gateway locations; the second applies the selection algorithms to dynamically route flows via one of the pre-determined gateways in real-time. The results indicate that the placement locations will perform best when the path length to the gateway and the current residual bandwidth are both taken into consideration which has higher priority to the first one. Read More Read Less

Abstract A method to provide cryptographically secure point-to-point and point-to-multipoint communication using an encrypted Bloom filter is implemented on a time-hopping CDMA optical fiber network. A novel Hammingweight minimization coding algorithm optimises the performance of the encrypted Bloom filter in terms of end-user bandwidth utilisation over previous proposals. The system has a total channel utilisation of up to 29% for 128... A method to provide cryptographically secure point-to-point and point-to-multipoint communication using an encrypted Bloom filter is implemented on a time-hopping CDMA optical fiber network. A novel Hammingweight minimization coding algorithm optimises the performance of the encrypted Bloom filter in terms of end-user bandwidth utilisation over previous proposals. The system has a total channel utilisation of up to 29% for 128 simultaneous users, up to 20 km apart, served by a single passive optical hub, or longer distances if served by an active hub. Read More Read Less

Abstract The accurate estimation of direction of interest which is also known as Direction of Arrival (DOA) of the incident signals is very significant to produce beam form antenna. There are several algorithms that have the ability to calculate the DOA of the incident signals. In this paper, we investigate and compare Multiple Signal Classification (MUSIC) and Estimation of Signal Parameters... The accurate estimation of direction of interest which is also known as Direction of Arrival (DOA) of the incident signals is very significant to produce beam form antenna. There are several algorithms that have the ability to calculate the DOA of the incident signals. In this paper, we investigate and compare Multiple Signal Classification (MUSIC) and Estimation of Signal Parameters via Rotational Invariance Technique (ESPRIT) algorithms in terms of the Angle of Arrival (AOA), Time of Arrival (TOA), Time Difference of Arrival (TDOA) and Received Signal Strength (RSS). MUSIC and ESPRIT algorithms are attractive solution to many parameter estimation problems. The performance of DOA using MUSIC and ESPRIT algorithm are analyzed on many parameters such number of users, number of snapshots, and number of array elements, user space distribution and SNR. MATLAB simulations indicate that both algorithms provide high resolution but the MUSIC algorithm is more accurate and stable compared to the ESPRIT algorithm. Read More Read Less