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A five-stage 93.9 GHz-105.6 GHz common-source CMOS amplifier is presented in this paper. The customized on-chip inductor and transmission line (TL) are designed for matching networks. Fabricated in a 65nm bulk CMOS process, this amplifier achieves a peak gain of 9 dB at 100 GHz and 11.7GHz 3-dB bandwidth range from 93.9 GHz to 105.6 GHz, consuming total power of 49.2 mW under 1.2 V voltage supply...
This paper investigates the virtual machine packing problem in cloud data centers. A cloud tenant expresses computation requirement for each virtual machine (VM) and bandwidth requirement for each pair of VMs. A cloud provider places the VMs and routes the traffic among the VMs in a way that minimizes the total number of servers used while providing both computation and bandwidth guarantees. We formulate...
We consider the problem of distributed detection involving multiple sensor nodes to jointly detect the presence of an unknown signal. To circumvent power/bandwidth constraints, a multilevel quantizer is employed in each sensor to quantize the original observation. The quantized data are transmitted through distortion channels to a fusion center where a generalized likelihood ratio test (GLRT) detector...
This paper describes a method of estimating the effective bandwidth through modeling the tail probability of one-way cumulative variable delays. In order to estimate the effective bandwidth of a fixed one-way path, a sequence of probing packets are sent from a source to a sink along the one-way path. The one-way cumulative variable delays are first estimated based on the local time measurements made...
In the view of the large scale and increasing kinds of service of space information networks, a service- oriented topology control algorithm is proposed. According to demands of existing service, the topology of network is divided into several logical sub-topologies, on which construct the corresponding topology. Taking the communication pattern as an example, the augmentation-based approach is adopted...
Space information networks promise encouraging prospects in areas of detection, communication and location. In this paper, node and link evaluation algorithms are proposed to provide reconfiguration basis for such networks. Given that space information networks operate in multi-application environments and offer diverse services, we take connectivity and availability into comprehensive consideration...
Existing traffic characterization systems today use passive monitoring techniques. Compared with active measurements, passive measurements have their own disadvantages: they are not easy to implement and need the cooperation of intermediate nodes along the path. Hence they require hardware change, which can significantly increase the cost of measurements. This makes active measurements an attractive...
Since information is growing explosively, the requirements for high performance storage systems are critical in practical applications. The research on performance prediction has become increasingly important in the area of distributed storage systems. This paper presents the architecture of iSCSI-based distributed RAID storage system. At the basis of analyzing the system data flow, the stochastic...
Ultra Wide Band (UWB) communication systems are considered to be ideally suited for future indoor and short-range wireless communications with high-speed data rate, as they operate at low power, provide high capacity in dense multipath environments. Combining the energy received over multipath, RAKE receiver usually holds good performances in the UWB communications environment. However, interferences...
A hybrid-fed dual-polarized stacked patch element with low cross-polarization and high port isolation is introduced. The proposed antenna element achieves a 10 dB return loss bandwidth of 840 MHz (about 15%) in C band. The crosspolarization of antenna keeps under -37 dB in both orthogonal ports with the isolation remains less than -42 dB in the whole bandwidth. The front-back ratio of radiation pattern...
This paper presents a band-stop filters with far spurious stop bands. At first, a coaxial cavity with far spurious stop band is proposed. Then several such coaxial cavities are connected in series to form a band-stop filter. To illustrate the design process, a coaxial band-stop filter has been designed, with a stop-band centered at 5 GHz, a bandwidth of 2 GHz, and its first spurious stop-band higher...
Streaming media applications require acceptable levels of quality of service (QoS). Appropriate rate control mechanism is needed to make streaming media applications to adapt to dynamic network conditions. This paper discusses a window-based weighted-fairness AIMD (WF-AIMD) congestion control algorithm which allows competing flows to share a common bandwidth according to their weights. By making flows...
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