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In this paper, a throughput-driven design technique is proposed, in which a suspicious timing error prediction circuit is inserted to monitor the signal transitions at some selected check points. Unlike previous works where timing errors are detected after their occurrence, the proposed method tries to use the real intermediate signal transitions for timing error prediction. The check point selection...
This paper addresses security and performance issues of MANET. A novel cluster oriented concept is proposed to enhance security and efficiency of the network. Proposed strategy insures the optimum performance of MANET in presence of black hole attack. The simulation of the proposed methodology is carried out using NS2 network simulator and the simulation results reflects the performance of scheme...
We propose a new method for full-duplex self-interference cancellation. The proposed scheme uses a precoder to align the self-interference channel with orthogonal direction of detection axis. The simulation result shows that the proposed RP-SIC enhances the average throughput of user equipment compared to the conventional scheme in high residual self-interference region.
This work investigates co-primary spectrum sharing problem in the local area indoor dense deployment scenario. A spectrum sharing method and relevant mechanism are designed to achieve flexible spectrum usage amongst multiple operator networks. This proposed solution improves spectrum efficiency by making small cells more flexibly and efficiently utilize whole spectrum resources via intra operator...
Lack of global knowledge in a delay tolerant network proves detrimental, for a replication based routing strategy, in terms of resource utilization. It has often been noticed that nodes keep on replicating a message although it has already been delivered to the destination since such information remains unknown to most of the nodes in the network. Moreover recovery mechanisms (like VACCINE for epidemic...
This paper proposes an efficient network coding aware opportunistic routing mechanism (CoAOR) for wireless mesh networks (WMNs). A new coding gain function is proposed for forwarder selection, which takes into account the number of flows considered in an encoded packet, the link quality, and the number of nodes that are able to decode an encoded packet. The weights of the three parameters in the function...
We study the problem of designing downlink scheduling policy for wireless networks with both real-time and non-real-time flows. Most existing scheduling policies for these networks unfairly favor one type of flows. As a result, strategic clients may lie about their types of traffic in order to get more service from the base station. To counter these strategic behaviors, a scheduling policy should...
Advances in microelectronics and integrated circuits, system-on-chip design, wireless communication and intelligent low-power sensors have empowered the development of Wireless Body Area Network (WBAN). IEEE 802.15.6 standard, approved in 2012, targets at wireless body area network. The network simulator 2 (NS-2) is a popular and powerful simulation tool, which provides substantial support for simulation...
Improving infrastructural systems' resilience to limit consequences of catastrophic and disruptive events is a major concern for policy makers and private operators. The aim of this work, developed within an international research project named Collaboration Management of Airports at Catastrophe (CMAC), is to capitalize on what the dramatic experience of March 2011 tsunami in Japan demonstrated. In...
We have proposed a memory sharing method of the wormhole routed network-on-chip architecture. In our method, a memory is shared between multiple physical links by using the multi-port memory. We evaluate and discuss the communication performance in the various situations. It is shown that the minimum number of memory banks required in multiport memory for 2D-torus and 2D-mesh networks is 8. Our proposed...
Low leakage power with maintained high throughput NoC is achieved. Traffic-based Virtual channel Activation algorithm (TVA) is proposed to activate/deactivate virtual channels in a NoC. The proposed algorithm implements Adaptive Virtual Channel technique of switching-OFF idle virtual channels in the NoC according to traffic heaviness. TVA is an efficient and flexible algorithm which provides set of...
State-of-the-art supercomputers are increasing the number of computing nodes to meet unlimited requirements of computation. Developing efficient interconnection networks that are responsible to communication features is one of the most crucial issues. However, many researches face problems in simulating large-scale interconnection network to estimate the communication performance. This paper is to...
Localized network coding can greatly improve the throughput of wireless mesh networks. In a typical practical wireless transmission mechanism using localized network coding, such as COPE, to make decision which forwarding packets should be coded together, each node needs to broadcast a notification message every τ interval time to inform their neighbors which packets they have buffered...
The IEEE 802.11 working group released the IEEE 802.11e protocol to provide QoS for different transmission business. The analysis of the EDCA mechanism in the IEEE 802.11e is made for the purpose of improving the network transmission performance and the QoS of the EDCA mechanism under different network load conditions. The focuses of this article are three priority parameters (AIFS, CW_min and CW_max,...
In this paper, the problem of distributed multiuser Opportunistic Spectrum Access is studied based on Partially Observable Markov Decision Process (POMDP), where the channels are partially observed by secondary users (SUs) constrained by hardware and energy. Considering the similarity of spectrum environment, the decision of every secondary user may be the same, which leads to collisions. Comparing...
In this paper, we propose an Aggregated Medium Access Control Protocol Data Unit (A-MPDU) using fragmented MPDUs with a Very High Throughput (VHT) Compressed Block Ack mechanism for use in IEEE 802.11ac Multi-User Multi-Input Multi-Output (MU-MIMO) Wireless Local Area Networks (WLANs). By allowing the use of fragmentation with the A-MPDU, the waste of medium resources in terms of meaningless A-MPDU...
In this paper, we investigate the performance of OLSR and AODV protocols in a Manhattan grid scenario when sending triple TCP flow over FTP. We considered data rates of 0.1 Mbps and 1 Mbps. For the simulations, we used SUMO and NS3. We considered IEEE 802.11p standard and TwoRayGroundPropagationLossModel. We use through-put and cwnd as evaluation metrics. The simulation results show that for small...
There is an increasing interest in Mobile Ad hoc Networks (MANETs) for their potential use in several fields such as collaborative computing, tactical networks and multimedia communications. Thus, MANETs need to support multiple communication flows in the network, while guaranteeing a good performance. In this paper, we analyze the performance of a MANET by simulations, considering multiple flows...
The behavior of Networked Embedded Systems (NES) is not only driven by network components but also by the surrounding environment. To verify the correct behavior of such systems, different tests should be performed under different environmental conditions. The complexity and expense of testing such systems in real environments leads us to propose a simulation-based approach to tackle this problem...
This paper proposes two novel channel quality indicator (CQI) update methods that provide conservative CQIs to improve the cell edge user throughput in coordinated scheduling/beamforming (CS/CB) schemes. In CS/CB, a user usually needs to feed back channel state information (CSI) to its serving cell as the first step. However, due to the lack of knowledge regarding neighboring coordinated cells, e...
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