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The developments of network infrastructures and personal intelligent devices, e.g., smart phones, makes the multimedia related services play an important role in network user applications. However, users are still troubled by limited bandwidth, burst of incoming service requests, and imbalance of content dissemination while enjoying the multimedia services. In this paper, we proposed a user grouping-based...
In this paper, a low-profile microstrip monopole antenna with an ultrawide bandwidth (UWB) is proposed. Via holes, rectangular patches, and a tune stub connecting ground plate are employed to improve the gain and impedance bandwidth of the antenna. Meanwhile, the antenna is etched on a single-layer substrate lowering the cost and complexity of manufacturing process. HFSS software is used to design...
Resilient networks are those capable of continuously offering telecommunication services in the presence of network failures. New paradigms for reliable network design have been emerging and constantly improving network survivability. Failure-Independent Path-Protecting (FIPP) p-cycles are a path based extension of the well-known p-cycle concept and inherit attractive properties of ring-like recovery...
Erasure-coded storages provide data reliability for big data archiving and backup with high storage efficiency. However, erasure code generates a large amount of data transmission traffic in both encoding (write) and decoding (repair) which costs substantial bandwidth in the network. Most of the existing work focus on the decoding cost due to the importance of data repair, but unfortunately overlooks...
Energy efficiency (EE) of wireless communications has attracted growing attention in recent years. In this paper, we focus on the EE optimization in cognitive radio networks (CRN) from a perspective of designing MAC frame structure, namely scheduling the sensing-then-transmission time slots. Considering secondary users adopting channel handoff to avoid collisions with primary users, the EE of CRN...
Data reliability is a significant issue in large-scale storage systems. Erasure codes provide high data reliability via data recovery, which however generates a large amount of data transmission in the network. The bandwidth cost of transmitting the recovery needed data significantly impacts the performance of the located cluster. Existing work considers the single-failure as the most common failure...
An optimized grating coupler featuring both ultra-broad bandwidth and high-efficiency has been achieved for the first time for the +1 diffraction order at a central operating wavelength 1.55 µm for TM polarization in horizontal slot waveguides. With proper design of the thickness of the groove thickness in grating region, we achieved a 60 nm 1 dB bandwidth, and the 3 dB bandwidth is 92 nm covering...
We report the observation of an ultra-narrow band plasmon induced transparency resonance which is realized in a large area hybrid plasmon-waveguide system consisting of a gold nanowire array embedded in a slab waveguide.
Multifunctional radar is a trend in the future. Employing radar system for high data rate, long range, anti-intercepted communication by making use of its wide bandwidth, high power and directing property has been a research hotspot nowadays. Hereinto, radar-communication compatible waveforms design is a key technique. This paper proposes a novel compatible waveform produced by modulating LFM signal...
QoS provisioning in wireless mesh networks has been to known as a challenging issue. In a distributed scheduling based wireless mesh backhaul network, conventional connection-based QoS provision mechanism requires considerable amount of overhead for per-link QoS signaling, thus cannot support high speed real time traffic. In this paper,we propose a DiffServ-like QoS provision mechanism for IEEE 802...
Emerging SONET/SDH techniques enable a high-bandwidth connection to be carried by multiple diversely-routed, low-speed connections. We investigate the benefits of such an inverse-multiplexing mechanism in optical networks and propose several efficient diverse-routing algorithms.
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