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Botnets have contributed to the significant part of the increasing malicious activities such as Distributed Denial of Service (DDoS), spam, and click fraud. Based on the analysis on the basic and essential characters of botnet, this paper deals with the botnet in two aspects: formal definition and general framework, covering various types of botnets overall. Through the formal definition and the general...
We propose new joint distributed Space-Time Block Code (STBC)-Distributed Turbo Product Code (DTPC) by generating the vertical parity on the relay and transmitting it to the destination using STBC on the source and relay. We tested our proposed system in a fast fading environment on the three channels connecting the three nodes in the cooperative network. Results show an overall gain that can reach...
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...
In this paper we investigate the effect of power allocation on the performance of the Distributed Turbo Product Code (DTPC) system. We study the error propagation on distributed coding systems when the relay makes erroneous decisions and present a simple power allocation method to alleviate the effect of relay decoding errors on the iterative decoding at the destination. We validate this method with...
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...
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...
We compare the outage performance by applying transmit antenna selection strategies to amplify-and-forward protocol in the MIMO relaying scenario. Although antenna selection is a suboptimal form of beamforming, it enjoys the advantages of tractable optimization and low feedback overhead. Specifically, by combining transmit antenna selection strategies with amplify-and-forward protocol, we propose...
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