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This letter considers a multiuser peer-to-peer communication network using a number of shared relays for collaborative beamforming and aims to minimize the total transmitted power of the relays whilst satisfying the targets of the signal-to-interference and noise ratios (SINRs) at the destination nodes by optimizing the relaying coefficients with imperfect channel state information (CSI). By deriving...
Lifetime extension is a key design issue for wireless sensor networks (WSN) with battery-operated nodes. Compared with direct transmission, transmission power can be significantly reduced by cooperative communication, because it can effectively mitigate multi-path fading by introducing space diversity. In this paper, BER analysis for M-PSK and M-QAM modulation in noncooperative and cooperative situations...
In this paper, we describe a probability model to analyze the effect of neighbor number size based on two performance metrics: video quality and distribution delay. Some simulation is done to prove the theory model. The theoretical analysis and the simulation both show that increasing the neighbor number size does little to the system video quality when the buffer size is large enough, but can reduce...
This paper presents an effective network-aware peer selection algorithm to alleviate the topology mismatch issue in BitTorrent. By utilizing the characteristic of hierarchical network topology, the Tracker in BitTorrent classifies the peers into three clusters: local, intra-ISP and inter-ISP clusters based on peers' traceroute results, and then chooses close peers within the first two clusters. Thus,...
Recent studies have shown that BitTorrent, one of the most popular peer-to-peer file-sharing systems, is confronted with two serious problems: robustness and fairness. In this paper, a partially decentralized trust management system for BitTorrent is presented to deal with the two problems. By extending and modifying the functionality of the tracker in BitTorrent swarm, the extended tracker serves...
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