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Traditional vehicular routing protocols cannot accurately foresee future location of each vehicle for efficient packet forwarding. Recently, the data mining approach has been applied to analyze huge vehicle trajectory data. In this paper, we propose a novel trajectory-based routing (NTR) protocol to improve the packet replication efficiency of vehicles in the Vehicular Delay Tolerant Network (VDTN)...
In this letter, the outage probabilities of selection relaying protocols are analyzed and compared for cooperative wireless networks. It is assumed that both source and relay use equal allocated time in transmission. Depending on the quality of the source-relay channel, the relay may choose either Decode-and-Forward (DF), Amplify-and-Forward (AF), or Direct-Transmission (DT) to forward signals. It...
In large scale wireless sensor networks, clustering is an effective technique for the purpose of improving the utilization of limited energy and prolonging the network lifetime. However, the problem of unbalanced energy dissipation exists in the multi-hop clustering model, where the cluster heads closer to the sink have to relay heavier traffic and consume more energy than farther nodes. Unequal clustering...
Wireless communication faces several security risks. An attacker can easily inject bogus packets, impersonating another sender. We refer to this attack as a spoofing attack. An attacker can also easily eavesdrop on communication record packets, and replay the (potentially altered) packets. In this paper, we are concerned of a particularly severe security attack that affects the ad hoc networks routing...
In the large-scale deployment of wireless sensor networks, when cluster-heads of the routing algorithm based on clustering transmit their data to sink via multi-top communication, the cluster-heads closer to sink are burdened with heavy relay traffic and tend to die early, causing energy holes that affect the normal operation of the network. It shortens the lifetime of network. To solve the problem...
As demand for high fidelity multimedia content has soared, content distribution has emerged as a critical application. Large multimedia files require effective content distribution services such as content distribution networks (CDNs). A recent trend in CDN development is the use of peer-to-peer (P2P) techniques to enhance scalability, fault resilience, and cost-effectiveness. Unfortunately, P2P-based...
This paper investigates a spectrum-efficient cooperative diversity method based on butterfly network, which endows that a relay can encode the data received from two users and then forward the coded data to destination. Under the assumption that the relay can reliably overhear the data from two users, we discuss the outage probability and diversity gain. Moreover, the outage probability and diversity...
Multi-hop broadcast is a key technique to disseminate important information such as time-sensitive safety warning messages (WMs) in Vehicular Ad hoc Networks (VANETs). Due to the fact that the implementation of broadcast at the link layer uses unreliable transmissions (i.e., lack of positive ACKs), highly reliable, scalable, and fast multi-hop broadcast protocol is particularly difficult to design...
The outage behavior of amplify-and-forward (AF) relaying protocol over an asynchronous cooperative network is examined when orthogonal frequency division multiplexing (OFDM) is used to combat synchronization error among the transmitting nodes. We consider non-orthogonal AF (NAF) and orthogonal1 AF (OAF) protocols, respectively, over a single relay and a two relay cooperative network and analyze the...
We present a distributed fast protocol for broadcast in ad hoc vehicular networks, and the results of a set of experiments that we carried to test it. Our proposal, called FROV, gains optimal performance in very reasonable real scenarios. These scenario are challenging and were not extensively studied in literature. In particular, we consider individual and variable transmission ranges of the vehicles...
In this paper, we study the diversity-multiplexing tradeoff (DMT) of a novel decode or quantize and forward (DoQF) protocol for the half duplex single relay channel. It is well-known that the so-called dynamic decode and forward (DDF) achieves the multiple-input-single-output (MISO) bound in the range of multiplexing gains r < 0.5. But to the best of our knowledge, no practical coding scheme allows...
Cooperative diversity systems rely on using relay nodes to relay copier of transmitted information to the destination such that each copy experiences different channel fading, hence increasing the diversity of the system. In this letter, we proposed a novel distributed cooperative beamforming scheme for decode-and-forward relay networks without channel state information (CSI) feedback. We further...
Multicasting can be an useful service in wireless mesh networks (WMNs), which have gained significant acceptance in recent years due to their potentials of providing a low-cost wireless backhaul service to mobile clients. Many applications in WMNs require efficient and reliable multicast communication, i.e., with high delivery ratio but with less overhead, among a group of recipients. However, in...
Cooperative hybrid-ARQ (HARQ) protocols have been widely studied because they are more efficient than cooperative protocols without HARQ. In, the throughput of a cooperative HARQ protocol based on the decode-and-forward protocol (DF-HARQ) is obtained. In this paper, the maximum achievable throughput of the DF-HARQ protocol is obtained using the asymptotic outage probability when the maximum number...
An updatable automatic repeat request (ARQ) protocol for distributed space-time coded cooperative networks is proposed in this paper. We define a decoding relay set (DS), composed of the relays decoding the packet from source correctly. The DS would be expanded as the round of ARQ increasing, because the relays failing to receive correct packet in previous (re)transmission are still possible to decode...
A cognitive OFDM-based relay network is considered in this paper. Communication between any node pair occurs on a spectrum pool of OFDM subcarriers where the subcarriers are not used by primary users. Therefore, the available spectrum for different transmitter-receiver pairs is distinct due to their location difference and so on. To satisfy different traffic demand and improve system performance,...
In this paper, we present a new outage probability analysis of a cooperative system with single antenna terminal. We first introduce the cooperation protocol of the presented scheme. Then, in the destination node, maximal ratio receiver combining (MRRC) and the maximum likelihood (ML) detection algorithm are applied to decode the received signal with the utilization of the signal received from the...
The autonomous behaviors of peers are usually neglected in the topology formation and adaptation in P2P network, thus a large number of Free-rider and Malicious peers would reside in the center of network, which degrades the user perceived QoE and overall network performance. In this paper, a novel and fully distributed approach Topology Adaptation algorithm based on Reciprocal Contribution (TARC)...
In this paper, a new protocol termed CoopXLM that integrates cooperative communication and Cross-Layer Module (XLM) is created and examined via simulation. CoopXLM modifies XLM by allowing multiple cooperative nodes to participate in receiver-based contention. Although there is increased energy consumption for processing, simulation results indicate that across all duty cycles there is an average...
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