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- Impact of the Propagation Environment on the Performance of Space-Frequency Coded MIMO-OFDM
- Previous work on space-frequency coded MIMOOFDM has been restricted to idealistic propagation conditions. In this paper, using a broadband MIMO channel model taking into account Ricean K-factor, transmit and receive angle spread, and antenna spacing, we study the impact of the propagation environment on the performance of space-frequency coded MIMO-OFDM.
- Tags: ETH Zurich, Performance, Environment, MIMO-OFDM, Performance Management, Human Resources, Workforce Management
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- Performance of Space-Frequency Coded Broadband OFDM Under Real-World Propagation Conditions
- This paper studies the impact of the propagation environment on the performance of space-frequency coded broadband OFDM systems. In particular, the paper derives the error-rate performance of space-frequency codes in the presence of transmit and receive correlation, and quantifies the maximum achievable diversity order and coding gain as a function...
- Tags: ETH Zurich, Performance, Broadband, Performance Management, OFDM, Broadband Internet, Network Technology, Telecommunications, Human Resources, Workforce Management, Wireless, Networking
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- Principles of MIMO-OFDM Wireless Systems
- The use of multiple antennas at both ends of a wireless link MIMO technology holds the potential to drastically improve the spectral efficiency and link reliability in future wireless communications systems. A particularly promising candidate for next-generation fixed and mobile wireless systems is the combination of MIMO technology with Orthogonal...
- Tags: ETH Zurich, MIMO, MIMO-OFDM, Wi-Fi, Wireless
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- Orthogonal Frequency Division Multiplexing Based on Offset QAM
- One of the factors determining the performance of wireless Orthogonal Frequency Division Multiplexing OFDM systems is time-frequency localization of the transmitter and receiver pulse shaping filters. OFDM based on offset quadrature amplitude modulation (OFDM/OQAM) bypasses a major disadvantage of OFDM based on ordinary QAM, namely the fact that time-frequency well-localized...
- Tags: ETH Zurich, OFDM, Wireless
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- Why QoS Will Be Needed in Metro Ethernets
- Emerging Metro Ethernets create new opportunities to converge data and telephony services. However, to connect legacy telephony equipment, networks have to meet customary QoS requirements even at the presence of bursty data cross traffic. This paper shows with analytical evaluation and simulation results that without appropriate mechanisms the QoS requirements...
- Tags: ETH Zurich, QoS, Telephony, Metro Ethernet, Ethernet, VOIP, Telecom & Utilities, Telecommunications, Networking
- White papers 2005-10-30
- Predicate-Based Indexing of Enterprise Web Applications
- Searching the Web has become a commodity. However, extending applications with search capabilities is still an open research topic. Large enterprise applications such as SAP and Oracle Finance implement their own search engines. Vendors of small applications cannot afford such an investment and, as a result, small applications either do...
- Tags: Web, ETH Zurich, Problem, Web Application, Search Technology, Search, Channel Management, Marketing
- White papers 2007-01-10
- General Framework for the Rapid Development of Interactive Paper Applications
- This paper presents a component-based framework that supports the rapid development of a wide variety of interactive paper applications. The framework includes authoring and publishing tools as well as a server that supports the linking of active areas on paper to a wide range of different media types and services.
- Tags: ETH Zurich, Framework, Productivity, Advertising & Promotion, Marketing
- White papers 2006-09-20
- Sampling in Open Source Software Development: The Case for Using the Debian GNU/Linux Distribution
- Research on Open Source OS projects often focuses on the SourceForge collaboration platform. The authors argue that a GNU/Linux distribution, such as Debian, is better suited for the sampling of projects because it avoids biases and contains unique information only available in an integrated environment. Especially research on the reuse...
- Tags: ETH Zurich, Open-source Software, Debian, Open Source, Operating Systems, Software
- White papers 2006-06-16
- Measurements From an 802.11b Mobile Ad Hoc Network
- This paper analyzes the characteristics of a multi-hop 802.11b mobile ad hoc network. The paper presents data gathered from a mobile network of 20 devices carried by test users over 5 days in an indoor environment. The data is analyzed with regard to the number of reachable devices, the node...
- Tags: Lifetime, ETH Zurich, IEEE 802.11, Mobile, Network, Data, Wireless LANs, Advertising & Promotion, Wireless, Wi-Fi, Marketing
- White papers 2006-04-13
- An Empirical Study of the Code Pitching Mechanism in the .NET Framework
- The .NET Compact Framework is designed to be a high-performance virtual machine for mobile and embedded devices that operate on Windows CE (version 4.1 and later). It achieves fast execution time by compiling methods dynamically instead of using interpretation. This paper studies the effect of code pitching on the overall...
- Tags: Paper, ETH Zurich, Microsoft .NET Framework, Microsoft .NET Compact Framework, .Net, Microsoft Windows CE, Application Servers, Middleware, Microsoft Windows, Software Development, Software/Web Development, Operating Systems, Software, Enterprise Software
- White papers 2006-04-01
- Smart Playing Cards - Enhancing the Gaming Experience With RFID
- The idea of pervasive gaming, where traditional, tabletop games are enhanced with wireless computing devices, has recently received increased attention. This paper presents a card game that is augmented with information technology to advise novice players and to relieve the players of mundane tasks, such as score keeping. The paper...
- Tags: ETH Zurich, Games, RFID, Personal Technology, Wireless, Security, Biometrics
- White papers 2006-03-28
- Coverage Enhancement for High-Quality Voice Over WLAN Systems Based on Diversity Techniques
- This paper considers the coverage range of a new system which is based on voice over WLAN Wireless Local Area Network and enhances this range using diversity techniques. This new system which has high Quality of Service QoS requirements has been developed within the WINDECT (Wireless local Area Network with...
- Tags: Technique, ETH Zurich, Voice, WLAN, Wireless LANs, LANs, Wi-Fi, Wireless, Networking
- White papers 2005-12-19
- QoS Extensions to Mobile Ad Hoc Routing Supporting Real-Time Applications
- Mobile Ad hoc NETworks MANETs, temporarily created by mobile devices, offer opportunities for sharing services and resources made available by member nodes. However, real-time applications require low latency connections with a minimum of jitter and packet loss rate from the underlying network. To meet these demands is a challenging task...
- Tags: ETH Zurich, QoS, Mobile, Network, Advertising & Promotion, Wi-Fi, Wireless, Marketing
- White papers 2005-11-21
- Comparison of Transmission Schemes for Framed ALOHA Based RFID Protocols
- The performance of RFID anti-collision protocols that are based on framed ALOHA depends on a transmission scheme that controls access to the shared channel. This paper outlines the characteristics of the RFID domain that impact the performance of such transmission schemes and compares four different transmission strategies. A novel technique...
- Tags: ETH Zurich, Performance, Transmission, RFID, Performance Management, Wireless, Security, Biometrics, Human Resources, Workforce Management
- White papers 2005-11-06
- Real-Time Multiplayer Game Support Using QoS Mechanisms in Mobile Ad Hoc Networks
- This paper analyzes and evaluates, via simulations, common QoS extensions, like backup route or priority queuing, and proposes some new ones, such as real-time neighbor aware rate control policies or hop-constrained queuing timeouts, to ad hoc routing in IEEE 802.11 mobile ad hoc networks. The paper shows how the performance,...
- Tags: Game, ETH Zurich, QoS, Mobile
- White papers 2005-11-05
- Transmission Control Scheme for Fast RFID Object Identification
- This paper presents a transmission control strategy for RFID anti-collision protocols that are based on framed ALOHA. The scheme specifically addresses characteristics of the RFID domain such as the strong capture effect and it also makes no restrictive assumptions on channel traffic. Experimental evidence and simulation results are presented showing...
- Tags: ETH Zurich, Transmission, RFID, Wireless, Security, Biometrics
- White papers 2005-09-12
- Dagstuhl Seminar "Mobile Information Management" - Executive Summary
- From October, 25th until 29th, 2004, a Dagstuhl seminar on mobile information management took place. The motivation for organizing this seminar was as follows: The combination of wireless and wired connectivity along with increasingly small and powerful mobile devices, such as laptops, personal digital assistants, handheld/tablet PCs, and smart phones,...
- Tags: ETH Zurich, Information Management, Seminar, Mobile, Advertising & Promotion, Tablets, Smart Phones, PDAs, Strategy, Marketing, Hardware, Notebooks & Tablets, Consumer Electronics, Personal Technology, Handhelds, Management
- White papers 2005-08-10
- Parallel Execution of Test Runs for Database Application Systems
- In a research paper, it was shown how tests for database application systems can be executed efficiently. The challenge was to control the state of the database during testing and to order the test runs in such a way that expensive reset operations that bring the database into the right...
- Tags: ETH Zurich, Application System, Goal, Storage, Databases, Hardware, Enterprise Software, Software, Data Management
- White papers 2005-07-19
- On the Capacity of Noncoherent Wideband MIMO-OFDM Systems
- In this paper the capacity behavior of full-band MIMO-OFDM systems in the absence of channel state information both at the transmitter and the receiver is studied. Based on capacity lower and upper bounds, the transmission rate penalty due to channel uncertainty as a function of the number of transmit antennas,...
- Tags: ETH Zurich, Workforce Management, Human Resources
- White papers 2005-06-23
- Power-Delay Tradeoffs in Bluetooth Scatternets
- Low power has become a primary concern in the field of ad-hoc and personal area networks. Bluetooth has emerged as a key enabling technology, providing low-power modes to match power consumption to application requirements. In spite of this, most power optimization proposals for Bluetooth are based on either over-simplified, fully...
- Tags: ETH Zurich, Bluetooth, Wi-Fi, Wireless
- White papers 2005-06-10
