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In a vehicular ad hoc network (VANET), high mobility and uneven distribution of vehicles are important factors affecting the performance of routing protocols. The high mobility may cause frequent changes of network topology, whereas the uneven distribution of vehicles may lead to routing failures due to network partition; even high density of vehicles may cause severe wireless channel contentions...
There exists an increasing strong demand for internet application in passenger trains, and the wireless broadband coverage along the whole railway is a prerequisite of the internet application in passenger trains. Wireless Mesh Network(WMN) based on 802.16 provides a new solution idea for the wireless broadband coverage of the railway, which is based on OFDM technology to support high-bandwidth data...
A novel information exchange scheme is proposed in this paper, which integrates Network Coding (NC) and Superposition Coding (SC) in two-way relay networks. The scheme focuses on the information exchange among more than two nodes through relay node in fewer time slots. Firstly, the Integrating Network Coding and Superposition Coding (INSC) scheme is proposed in scenarios with and without overhearing...
Random Network Coding (RNC) has emerged as an important technology in wireless communication. The present paper proposes a novel cooperative Virtual-MIMO (V-MIMO) structure by applying RNC to the cooperative transmission. Then the diversity gain of the RNC-based cooperative strategy is analyzed and compared with the conventional cooperative strategies. Higher diversity gain or multiplexing gain can...
We propose a cooperative orthogonal space-time block codes (OSTBC) transmission scheme in the adaptive-gain amplify-and-forward MIMO relaying with NS source antennas, NR relay antennas, and ND destination antennas, and analyze the asymptotic performance of the proposed scheme. Specifically, we explore the instantaneous channel state information (CSI) of source-to-relay channel and design an OSTBC...
A novel coordinated scheduling algorithm for OFDM-based systems in multi-cell scenario is proposed in this paper. The studied algorithm based on the utility function is general for the downlink of networks. The algorithm coordinates the subcarrier assignment over the BS cluster. We first establish the framework for this inter-cell coordinated optimization problem through utility-based method. The...
In this work, we propose Multiple Sink Dynamic Destination Geographic Routing (MSDDGR), a routing protocol for multiple sink wireless sensor networks. MSDDGR is based on greedy forwarding scheme, which decides the route only using the neighboring information in the local network topology. When a packet needs to be sent, the sender selects the nearest sink as the current destination, which brings dynamic...
TCP protocol generally suffers from poor performance and network unfairness problems over multi-hop ad hoc networks. As designed for wired networks only, the legacy TCP always induces the over-reaction of network failure and hurts the quality of end-to-end connection in ad hoc networks. In this case, improvements have been proposed in the literature to help TCP to be aware of the different types of...
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