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Network coding is a promising technique to improve the throughput performance of wireless networks. In this paper, we propose a novel network-coding-based hybrid retransmission request protocol for two-way relaying system. The proposed protocol can retransmit more information in a given time interval by introducing network coding in the retransmission process, thus improving the throughput. Furthermore,...
In this paper we exploit the characteristics of Physical layer Network Coding (PNC) in multicast short range networks. We present a scalable scenario of partially overlapping short range networks, where collisions are resolved through indirect inter-group cooperation based on the features of PNC. Our scenario consists of a central network, which is our network of interest, and several surrounding...
To accommodate the dynamic characteristics in opportunistic networks, ``carry-and-forward'' technique is utilized. In this paradigm, the next hop forwarding relay node is usually decided by inferring future contact opportunities. A practical method is to predict future encounter time using nodes' contact history. But limited by prediction accuracy, this method has only an uncertain effect on improving...
The lack of available and practical analysis about some regular knowledge of mobility models has limit their applications to mobile ad hoc networks. As the mobility models have the great significance effects on the network performance, and meanwhile, existing in-depth researches are mostly based on the i.i.d. mobility model which is a way of globe move, the desire for the effective and reasonable...
For ad-hoc wireless sensor networks (WSN), multi-hop routing has been adopted in order to save communication power consumption and to increase network lifetimes. In contrast to traditional multi-hop routing, the Opportunistic Routing (OR) protocol provides an alternative and efficient method for exploiting the spatial and temporal characteristics of wireless networks. One of the more important aspects...
DTN (Delay Tolerant Network) is a new type of mobile Ad Hoc network. Due to its characteristics such as long communication delay, high dynamic topology, it is difficult to maintain the stability of end to end paths. Therefore, design of effective and reliable routing algorithms has become the key issue in DTN. To avoid random and blindfold forwarding in Spray and Wait routing, a DTN routing algorithm...
We propose a resources reservation scheme pro-vides QoS for handing over stations within Mobile Multi-hop Relay Networks. The original time interval between two consecutive scans is divided into multiple intermediate time intervals for scan or transmission/reception. On the light of the intermediate scan results and depending on the "Mobility Context " of the SS or the mobile RS, the reservation...
Vehicular Ad-hoc Networks (VANET) offer promising solutions towards infrastructureless collaborative active safety of the road vehicles. Active safety related data dissemination in vehicle-to-vehicle (V2V) communication requires reliable and real-time transmission. Broadcasting and relaying safety messages to alert the surrounding vehicles about critical driving situations is considered to be timely...
This paper presents results of the Seventh Framework Programme (FP7) LOLA (achieving LOw LAtency in wireless communications) project about the design of a cooperative broadcast (CB) technique based on a decode and forward (DF) protocol, in the context of a clusterized wireless mesh network (WMN) based on 3GPP LTE PHY/MAC layers. The CB technique is compared to a baseline broadcast technique, obtained...
In a two-way wireless relay network, two nodes communicate with each other through a relay, and throughput is enhanced by the relay transmitting a linear combination of the messages received from the two sources either at the bit level (digital network coding) or the signal level (analog network coding). In this paper, we solve for the fraction of time resources allocated to each transmission mode...
This paper investigates performance tradeoffs between energy and information transfer in a relay based two-hop wireless system involving an energy harvesting receiver. The source and relay nodes of the two-hop amplify-and-forward (AF) system employ orthogonal space-time block codes along with orthogonal frequency-division multiplexing (OFDM) scheme. The joint optimal source and relay precoders over...
This paper considers multiuser cooperative relay networks with user selection at the mobile station, where both the relay and mobile users are corrupted by a finite number of co-channel interferers. We study the impact of the outdated channel state information (CSI) on the system performances over time-varying Rayleigh fading channels by deriving the tight lower bounds for the outage probability and...
This paper proposed a routing protocol integrating both the characteristic of the flooding-based protocol and forwarding-based protocol. The basic idea of our protocol is to let message be forwarded to the nodes moving toward or closer to destination. When nodes contact with each other, our approach will utilize the path of the node, node's moving direction and velocity to estimate the probability...
We propose a new transmission protocol for two-hop transmission employing rateless coding in the first hop and rateless-network coding in the second hop. In this protocol, communicating pairs (CP) and also relays are partitioned into small clusters; afterwards, each CP-cluster is assigned one relay cluster to improve data transmission. This scheme increases the diversity order (in comparison to the...
This paper proposes a novel relay selection protocol for distributed cooperative networks, that eliminates the effect of asynchronism between different received signals. The suggested protocol maintains a high diversity order, with minimum message complexity and overall time delay, and it also provides a better performance in terms of power consumption and error rates than existing selection protocols...
Due to diverse network latencies, participants in a Distributed Virtual Environment (DVE) may observe different inconsistency levels of the simulated virtual world, which can seriously affect fair competition among them. In this paper, we investigate how to disseminate Dead Reckoning (DR)-based updates with the objectives of achieving fairness among participants and reducing inconsistency as much...
Limited resources in Wireless Sensor Networks (WSNs) are the key concern that needs to be given a careful consideration when studying virtually any aspect of a sensor network. Therefore, energy demands and radio bandwidth utilization should be addressed, especially in one-to-many communication. To define the problem, this article presents and categorizes the most common WSN multicast procedures depending...
Modeling tools are useful for basic understanding of power system, particularly for new engineers. Such tools help the new engineers to modulate the system under normal and faulty conditions. This paper presents the modeling and simulation of digital reverse power relay on MATLAB/Simulink®. Various data conversion steps in digitization of a signal are also discussed. In the past, electromechanical...
It was recently shown that the reverse carpooling technique can realize the benefits of network coding while requiring only a simple coding scheme that can be efficiently implemented in practice. However, when no opportunity for coding exists at an intermediate (relay) node, it needs to decide whether to transmit an uncoded packet or wait for the next opportunity to create a coded packet. While the...
Routing for Delay Tolerant Networks (DTNs) are challengeable for the continuously varied network environment. Most of existing DTN routing algorithms mainly focus on metrics such as delay, hop count and bandwidth, etc. Green communication is a new focus with the goal of saving energy by optimizing network performance and ultimately protecting the natural climate. In this paper, we present an Energy-efficient...
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