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In recent years, Dynamic Adaptive Streaming over HTTP (DASH) has gained momentum as an effective solution for delivering videos on the Internet. This trend is further driven by the deployment of existing HTTP cache infrastructures in DASH systems to reduce the traffic load as well as to serve clients better. However, deploying conventional cache servers in DASH systems still suffers from low cache...
Recent years have witnessed a new content delivery paradigm named crowdsourced CDN, in which devices deployed at edge network can prefetch contents and provide content delivery service. Crowdsourced CDN offers high-quality experience to end-users by reducing their content access latency and alleviates the load of network backbone by making use of network and storage resources at millions of edge devices...
WiFi networks play a significant role in providing today's wireless connectivity, therefore, understanding and improving WiFi network performance is important for today's mobile applications and services. Previous studies conducted to investigate WiFi network performance have generally been performed using specific types of WiFi networks in relatively small areas and have been limited by either the...
Recent years have witnessed a dramatic increase of user-generated video services. In such user-generated video services, crowdsourced live streaming (e.g., Periscope, Twitch) has significantly challenged today's content delivery infrastructure: today's edge networks (e.g., 4G, Wi-Fi) have limited uplink capacity support, making high-bitrate live streaming over such links fundamentally impossible....
4G/3G Networks have been widely deployed around the world to provide high wireless bandwidth for mobile users. However, the achievable 3G/4G bandwidth is still much lower than their theoretic maximum. Signal strengths and available backhaul capacities may vary significantly at different locations and times, often leading to unsatisfactory performance. Band-width aggregation, which uses multiple interfaces...
Dynamic adaptive streaming over HTTP (DASH) has seen a rapid increase in recent years. While opening a door for ensuring smooth video playback with bitrate adaptation, especially for unstable networks, DASH also requires a set of new streaming strategies (e.g., bitrate adaptation). A key of designing these strategies is to understand the viewing engagement patterns in DASH, which are the correlation...
The structure and performance of several modulation for atmospheric optical wireless communications was studied and was contrasted under an optical wireless communications model with atmospheric optical radiance scintillation channel Firstly, it discusses the conversion relations of symbol error rate and bit error rate from error theory perspectives analysis atmospheric optical wireless communications,...
Dynamic adaptive video streaming has emerged as a popular approach for video streaming in today's Internet. To date the two important components in dynamic adaptive streaming, video transcoding which generates the adaptive bitrates of a video and video delivery which streams the videos to users, have been separately studied, resulting in a huge waste of computation and storage resource due to transcoding...
Recently, Peer-to-Peer (P2P) based multi-party video conference systems have been widely deployed. However, those solutions suffer from high cost when multiple users simultaneously distribute video streams to receivers. Most existing systems only support up to a dozen of users at the same time. In this paper, we propose a novel approach to construct and manage a heterogeneous P2P network for scalable...
Existing low-power MAC protocols only provide low throughput because of the fixed low duty-cycle. This often leads to poor performance when dealing with time-constrained burst traffic. In this paper, we propose a new hybrid CSMA/TDMA MAC protocol, called Queue-MAC, that dynamically adapts the duty-cycle according to the current network traffic. The queue length of nodes is used as the network traffic...
We report a highly tunable liquid-filled photonic bandgap fiber (LF-PBGF) based on both bend and temperature change. By bending the LF-PBGF and changing its temperature, the blue shift of the red edge of the bandgap resulting from bend loss and temperature increasing is speeded up, and higher bandwidth tunability is achieved. Numerical and experimental results are presented, and 177-nm bandwidth tunability...
Online games and social networks are cross-pollinating rapidly in today's Internet: Online social network sites are deploying more and more games in their systems, while online game providers are leveraging social networks to power their games. An intriguing development as it is, the operational challenge in the previous game persists, i.e., the large server operational cost remains a non-negligible...
As compared to live peer-to-peer (P2P) streaming, modern P2P video-on-demand (VoD) systems have brought much larger volumes of videos and more interactive controls to the Internet users. Nevertheless, the larger number of available videos and the flexibility of allowing users to jump back and forth in a video, have led to much fewer numbers of concurrent peers watching at a similar pace, that reduces...
As compared to live peer-to-peer (P2P) streaming, modern P2P video-on-demand (VoD) systems have brought much larger volumes of videos and more interactive controls to the Internet users. As the increase of bitrate of the videos and the full VCR controls of P2P VoD, the behavior “buffering” motivates us to design different schedule and service strategies for peers, to improve the playback performance,...
The characteristic impedance of L-type and T-type networks are investigated for the distributed amplifier (DA) design respectively. The analysis shows that the L-type network has better frequency characteristics than the T-type one. Two distributed amplifiers with L- and T-type network are designed with 2-μm GaAs HBT process for comparison. The simulation results demonstrate that the DA with L-type...
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