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Improving harmonic rejection for spectrum sensing using crosscorrelation

Improving harmonic rejection for spectrum sensing using cros...

引用

38th European Solid State Circuits Conference, ESSCIRC 2012

作者： Oude Alink, Mark S. Kokkeler, André B. J. Klumperink, Eric A. M. Ru, Zhiyu Cheng, Wei Nauta, Bram Integrated Circuit Design/Computer Architecture for Embedded Systems CTIT Research Institute University of Twente Enschede Netherlands

ISBN: (纸本)9781467322126

Harmonic downmixing may cause a spectrum sensing device to erroneously flag parts of the spectrum as occupied. Receivers employing harmonic rejection (HR) rarely obtain more than 60 dB of HR, which may not be enough for spectrum sensing for dynamic spectrum access. We improve HR by employing two RF-receivers, integrated in a single 65nm CMOS IC, and using a small offset in their LO-frequencies. The offset is corrected in the digital baseband, after which the final receiver outputs are crosscorrelated. Our measurements show that the HR can be significantly improved without calibration or time penalty, even for high initial HR, but that the improvement is limited by crosstalk between the receivers. © 2012 IEEE.

关键词： Spectrum analyzers

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Multi-domain transformational design flow for embedded systems

Multi-domain transformational design flow for embedded syste...

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2011 11th International Conference on embedded computer systems: architectures, Modeling and Simulation, IC-SAMOS 2011

作者： Rovers, Kenneth C. Van De Burgwal, Marcel D. Kuper, Jan Kokkeler, André B.J. Smit, Gerard J. M. Computer Architecture for Embedded Systems Group Department of EEMCS CTIT University of Twente P.O. Box 217 7500 AE Enschede Netherlands

ISBN: (纸本)9781457708008

Current tools for embedded system design have limited support for modelling the interaction of the system with its physical environment. Furthermore, the natural representation of (streaming, real-time) applications with dataflow models is not supported by most tools. However, integrating multiple domains supports the design of complex interdisciplinary systems and enables model transformations. In this paper we discuss a unified approach, called UniTi, to handle continuous and discrete time models in a single framework, which includes the dataflow model as well. Our approach consists of a transformational design flow, expressed mathematically in a functional language. We formally distinguish the various domains and explain their interaction. In addition, we give guidelines for specifying algorithms such that these transformations can be applied. Our approach is illustrated with a non-trivial case study: beamforming in a phased array system. © 2011 IEEE.

关键词： embedded systems

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A CMOS spectrum analyzer frontend for cognitive radio achieving +25dBm IIP3 and -169 dBm/Hz DANL

A CMOS spectrum analyzer frontend for cognitive radio achiev...

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2012 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2012

作者： Oude Alink, Mark S. Klumperink, Eric A.M. Kokkeler, André B.J. Cheng, Wei Ru, Zhiyu Ghaffari, Amir Wienk, Gerard J.M. Nauta, Bram Integrated Circuit Design/Computer Architecture for Embedded Systems CTIT Research Institute University of Twente Enschede Netherlands

ISBN: (纸本)9781467304146

A dual RF-receiver preceded by discrete-step attenuators is implemented in 65nm CMOS and operates from 0.3-1.0 GHz. The noise of the receivers is reduced by cross-correlating the two receiver outputs in the digital baseband, allowing attenuation of the RF input signal to increase linearity. With this technique a displayed average noise level below -169 dBm/Hz is obtained with +25 dBm IIP3, giving a spurious-free dynamic range of 89 dB in 1 MHz resolution bandwidth. © 2012 IEEE.

关键词： Noise figure

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A 50MHz-to-1.5GHz cross-correlation CMOS spectrum analyzer for cognitive radio with 89dB SFDR in 1MHz RBW

A 50MHz-to-1.5GHz cross-correlation CMOS spectrum analyzer f...

引用

2010 IEEE Symposium on New Frontiers in Dynamic Spectrum, DySPAN 2010

作者： Oude Alink, Mark S. Klumperink, Eric A. M. Soer, Michiel C. M. Kokkeler, André B. J. Nauta, Bram Integrated Circuit Design/Computer Architecture for Embedded Systems CTIT Research Institute University of Twente Enschede Netherlands

ISBN: (纸本)9781424451883

Spectrum sensing for cognitive radio requires a high linearity to handle strong signals, and at the same time a low noise figure (NF) to enable detection of much weaker signals. Often there is a trade-off between linearity and noise: improving one of them degrades the other. Cross-correlation can break this trade-off by reducing noise at the cost of measurement time. An existing RF front-end in CMOS-technology with IIP3=+11dBm and NF

关键词： Spectrum analyzers

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A Petri net table model applied to classic and agile project management

A Petri net table model applied to classic and agile project...

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2019 International Workshop on Petri Nets and Software Engineering, PNSE 2019

作者： Weichenhain, Maxi Fengler, Wolfgang Computer Architecture and Embedded Systems Group Technische Universität Ilmenau Germany

The world of project management (PM) is diverse and extensive, as is the resulting tool selection on the market. Despite the wide variety of tools available, many PM activities are carried out using self-developed spreadsheets that have been tailored to meet the needs of the project. The authors have evaluated experiences from several completed projects and recognizes the need for a systematic model based on a formalised and tool-independent table structure. The goal of this work is to use a powerful Petri net (PN) model for mapping and simulation, taking advantage of the model's benefits. Thus, an effective and flexible methodology for PM can be realised. In order to use the concept of PN for this purpose, appropriated extensions and necessary interpretations from the area of high-level timed Petri nets must be used. Moreover, PM has to be brought to the same description level as PN. The concept of this proposed method is to enter all data, initial plan inputs and intermediate status updates into a defined table structure. A PN is then automatically generated in the background or updated to reflect the current status of the project. Simulations should be performed on the PN models, and their results should be put back into the table. The advantages of the PN concept can thus be fully exploited and become useful for a project manager, even if he or she does not have any PN knowledge. This article presents an overview of the proposed formalised methodology, its suitability to PM, and its benefits. The method itself can be applied to a wide range of projects. Focus is placed on how to transfer certain areas of PM into the introduced PN constructs and interfaces. Examples are used to illustrate how to transform PM activities and their related information into the selected PNs. © 2019 CEUR Workshop Proceedings. All rights reserved.

关键词： Petri nets

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3D INS/UWB based real time sensor fusion indoor position tracking architecture 13

3D INS/UWB based real time sensor fusion indoor position tra...

引用

13th IEEE Annual Information Technology, Electronics and Mobile Communication Conference, IEMCON 2022

作者： Kirchhoff, Michael Debo, Saad Nau, Johannes Group for Computer Architecture and Embedded Systems Technische Universität Ilmenau Ilmenau Germany

ISBN: (数字)9781665463164

ISBN: (纸本)9781665463164

Accurate indoor position tracking and analysis of the movement dynamics of autonomous driving systems are important challenges when it comes to automatize industrial processing, supply chains or warehouses. In this paper, the authors present an indoor position tracking architecture with a novel sensor fusion approach for autonomous robots in three-dimensional space. For robots to be able to drive autonomous, they need information of their position, speed and orientation in 3D-space. With the presented architecture, position information is provided by the Indoor Positioning System (IPS) and orientation information as well as velocity are determined by the Inertial Navigation System (INS). The proposed tracking architecture combines those informations with a sensor fusion approach, thus enabling the autonomous driving system. © 2022 IEEE.

关键词： Real time systems

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LiSARD: LabVIEW integrated softcore architecture for reconfigurable devices

LiSARD: LabVIEW integrated softcore architecture for reconfi...

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2011 International Conference on Reconfigurable Computing and FPGAs, ReConFig 2011

作者： Pacholik, A. Klockner, J. Muller, M. Gushchina, I. Fengler, W. Computer Architecture and Embedded Systems Group Ilmenau University of Technology 98684 Ilmenau Germany

ISBN: (纸本)9780769545516

The development of industrial control and measurement systems is often based on modular commercial off the-shelf hardware. Lately, for these platforms reconfigurable I/O modules with field-programmable gate arrays (FPGA) have gained significance, since they allow the implementation of data processing functionality very close to the data acquisition interfaces. However, algorithm complexity and floating-point support are limited by FGPA resources and design methods. This contribution presents an application specific configurable DSP soft core architecture built around a scalable double precision floating-point arithmetic/logic unit. The core can be seamlessly utilized as a functional component in Lab VIEW based FPGA designs. A small case study shows the performance of an example application implemented on the presented core in comparison to other embedded architectures. © 2011 IEEE.

关键词： Digital arithmetic

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A dataflow inspired programming paradigm for coarse-grained reconfigurable arrays

A dataflow inspired programming paradigm for coarse-grained ...

引用

10th International Symposium on Reconfigurable Computing: architectures, Tools, and Applications, ARC 2014

作者： Niedermeier, A. Kuper, Jan Smit, Gerard J. M. Computer Architecture for Embedded Systems Group Department of Electrical Engineering Mathematics and Computer Science University of Twente Netherlands

ISBN: (纸本)9783319059594

In this paper, we present a new approach towards programming coarse-grained reconfigurable arrays (CGRAs) in an intuitive, dataflow inspired way. Based on the observation that available CGRAs are usually programmed using C, which lacks proper support for instruction-level parallelism, we instead started from a dataflow perspective combined with a language that inherently supports parallel structures. Our programming paradigm decouples the local functionality of a core from the global flow of data, i.e. the kernels from the routing. We will describe the ideas of our programming paradigm and also the language and compiler itself. Our complete system, including the CGRA, the programming language and the compiler, was developed using Haskell, which leads to a complete, sound system. We finish the paper with the implementation of a number of algorithms using our system. © 2014 Springer International Publishing Switzerland.

关键词： Program compilers

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Smart Sensing and Context 1

引用

丛书名： Lecture Notes in computer Science

1000年

作者： Paul Havinga Maria Lijding Nirvana Meratnia Maarten Wegdam

ISBN: (数字)9783540478454

ISBN: (纸本)9783540478423

This volume contains the papers and posters selected for presentation at the First European Conference on Smart Sensing and Context (EuroSSC 2006) in Enschede, The Netherlands. EuroSSC 2006 was the ?rst conference of a series aiming at bringing together designers, engineers and researchers to explore two complementary viewpoints: – A device-centric,technology-drivenview: concerning intelligent sensors,s- sor networks and information processing for a new generation of networked devices and environments. – A service-centric, user-driven view: exploring architectures, techniques, and algorithms for context-aware and pro-active applications made possible by thedi?usionofambientcommunication,cooperatingobjects,andinteraction technologies. These subjects are active and relevant research areas in themselves, and there are several conferences that address them separately. EuroSSC 2006, however, considered them both, and especially the symbiosis between them, which we expect to result in very inspiring and interesting discussions, as well as new research ideas on how to combine them. The conference was organized in single tracks covering various issues ra- ing from intelligent sensors, sensor networks, context management and context awareness,andprivacy,toapplicationsandtestbeds. Organizingaconferencefor the ?rst time requires lots of preparations, such as ?nding a publisher, spons- ing organizations,and TPC members and most importantly attracting potential submitters. Fortunately, the amount and quality of the submissions were such that we were in the luxurious position to be able to accept only high quality and relevant papers. The conference attracted world wide attention and submissions came from ?ve continents. A total of 15 accepted full papers and 14accepted posters came from Asia, North America and Europe.

关键词： Information systems Applications (incl. Internet) Information Storage and Retrieval computer Communication Networks User Interfaces and Human computer Interaction Algorithm Analysis and Problem Complexity Communications Engineering, Networks

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Multi-domain transformational design flow for embedded systems

Multi-domain transformational design flow for embedded syste...

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International Conference on embedded computer systems: architectures, Modeling and Simulation (IC-SAMOS)

作者： Kenneth C. Rovers Marcel D. van de Burgwal Jan Kuper André B. J. Kokkeler Gerard J. M. Smit Computer Architecture for Embedded Systems group CTIT Department of EEMCS University of Twente Enschede Netherlands

关键词： Mathematical model Hardware Parallel processing computer architecture embedded systems Delay

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