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Wireless communication is an increasingly ubiquitous and important resource substrate of the digital ecosystem. In the face of the rapid growth in the population of Internet of Things (IoT), however, uncoordinated access to limited resources of radio spectrum is likely to lead to mass starvation. Here we put forward a new bio-social paradigm for cognitive radio, extending previous models in which...
Most of the high speed low power ADCs are interleaved using calibration which have some drawback like calibration time, the complexity associated with calibration algorithm and its circuit implementation. Therefore a single channel calibration-free 12-bit ADC sampling at 600MS/s in 28nm UTBB FDSOI is presented. Selected ADC architecture of mixing Pipelined stage and Asynchronous SAR demonstrates advantages...
Recent studies show that the wireless technology could resolve the oversubscription issue in wireless data center networks (WDCNs). However, these works only focus on transmitting traffic flows at the top-of-rack (ToR) switch. In this paper, we propose a deadline-aware rate control scheme (DRCS) that detects the network congestion situation by considering the flow size, deadline, and the number of...
This paper presents a new mechanism for data transmission over mobile networks. The ultimate goal of designing the next generation mobile network is to have a single network that can support all applications with different data attributes. The proposed mechanism in this paper is inspired by the Mechanism Design Theory that is an emerging branch of game theory and has been used successfully in economics...
Modern SOCs may be composed of hundreds of individual physical modules, referred to as tiles. The total number of scan channels servicing these tiles often greatly exceeds the number of SOC device pins available to connect those channels to test equipment. Traditional reliance on a small number of pin-to-channel test mode configurations, predetermined in hardware, results in inefficient scan data...
Differential-mode Ćuk inverter (DMCI) represents a class of single-stage inverter with low device count, modular symmetry, and topological simplicity. Recently, discontinuous modulation scheme (DMS) has been proposed for the DMCI. This paper extends the modular nature of the power stage to the control architecture and proposes a transformation-based tracking controller using adaptive control algorithm...
Current network protocols are exceedingly strict, making the administrative duties of network providers difficult. The switches that control a network rely on stringent definitions, usually defined by the company who designed the switch, with which they can forward packets. Software Defined Networking (SDN) is a concept which allows control over the operations of a switch via remote software applications...
Network faults like link or switch failures can cause heavy congestion and packet loss. Traffic engineering systems need a lot of time to detect and react to such faults, which results in significant recovery times. Recent work either pre-installs a lot of backup paths in the switches to ensure fast reroute, or proactively pre-reserve bandwidth to achieve fault-resiliency. Our idea agilely reacts...
Future Internet proposals have employed edge-directed routing to realize the benefits of path choice by the sources (e.g., end users). However, economic issues hamper the adoption by ISPs: 1) ISPs' costs increase when sources choose paths that are not economically optimal for ISPs, and 2) ISPs have to overprovision their links aggressively since traffic engineering is shifted to the users and congestion...
In this paper, we analyze flow-based routing schemes in SDN. Specifically, we study the flow-based routing performance; combining the knowledge of the link condition and updating the period for calculating the path. The framework uses centralized control of SDN where the SDN controller calculates available paths to determine the routing policy based on a global knowledge network. This flow-based routing...
In this paper, we propose a wideband circular polarization switchable microstrip antenna with a double balanced multiplier (DBM). The antenna is based on a concept that an antenna integrates microwave circuits to enhance antenna performances. By a unique operation of the DBM, circular polarization is generated including its sense switching function.
Network is critical resource for applications, but current datacenter network is shared among untrusted tenants in a best-effort manner, which cannot guarantee fairness among tenants. Fair network sharing in datacenter is a challenging problem, because the network resource is multiplexed by many virtual machines (VMs), and every VM cannot know its explicit fair bandwidth with little knowledge of network's...
Software Defined Networking (SDN) is emerging as a new paradigm in which the control plane is decoupled from the data plane. SDN is an enabler of network control to become directly programmable. The underlying infrastructure can be abstracted from applications and network services. Recently, SDN has rapidly expanded and attracted many research efforts. In the open literature, analytical tools have...
There has been significant interest in the use of HTTP adaptive streaming for live or on-demand video over the Internet in recent years. To mitigate the streaming transmission delay and reduce the networking overhead, an effective and critical approach is to utilize cache servers between the origin servers and the heterogeneous clients. As the underlying protocol for web transactions, HTTP has great...
Dynamic adaptive streaming over HTTP (DASH) has recently been widely deployed in the Internet. It, however, does not impose any adaptation logic for selecting the quality of video fragments requested by clients. In this challenge, we have designed a novel rate adaptation scheme for Dynamic HTTP Streaming, by which, low start-up time, continuous and smooth video playback, and high bandwidth utilization...
This paper presents design of a subwavelength patch antenna using epsilon negative metamaterial. Firstly, the metamaterial is designed at resonant frequency of reference rectangular patch antenna at 5.2 GHz and then this designed metamaterial is applied underneath the reference patch antenna. Addition of ENG metamaterial underneath the patch antenna decreases its resonant frequency. Simulation results...
In recent pattern matching architecture researches, there has been much attention to high-throughput implementations with reconfiguration on the fly on FPGAs as well as ASICs. In this paper, we propose to use self-organizing approach to synthesize two-dimensional map (cluster) of a simple processing units with lateral links for fast pattern matching of one-dimensional input event. We suggest scalable...
This paper gives a brief report on a new 100-Gbps academic backbone network, called SINET5, which started full-scale operations in April 2016. SINET5 has more than 50 backbone routers and forms a fully meshed topology by using MPLS-TP systems to provide researchers in every Japanese prefecture with 100-Gbps access, minimized-latency, and SDN-friendly environments. SINET5 gives a multi-layer, dynamically...
The introduction of the Common Public Radio Interface (CPRI) technology allows for a centralization in Base Bandwidth Unit (BBU) of some access functions with advantages in terms of power consumption saving when switching off algorithms are implemented. Unfortunately the advantages of the CPRI technology is to be paid with an increase in bandwidth to be carried between the BBU and the Radio Remote...
This paper describes a centralized routing algorithm based on permutation of M traffic flows entering the network. The proposed approach is significantly less complex than combinatorial approach and can be used as load-balancing tool. The main advantage of such approach is that many non-perspective flow permutations could be eliminated from the calculation very early. If a new flow enters the network...
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