Showing papers in "IEEE Vehicular Technology Magazine in 2006"
TL;DR: Among the possible subcarrier mapping approaches, it is found that localizedFDMA (LFDMA) with channel-dependent scheduling (CDS) results in higher throughput than interleaved FDMA (JFDMA), however, the PARR performance of IFDMA is better than that of LFDMA.
Abstract: Single carrier frequency division multiple access (SC FDMA), a modified form of orthogonal FDMA (OFDMA), is a promising technique for high data rate uplink communications in future cellular systems. SC-FDMA has similar throughput performance and essentially the same overall complexity as OFDMA. A principal advantage of SC-FDMA is the peak-to-average power ratio (PARR), which is lower than that of OFDMA. SC FDMA is currently a strong candidate for the uplink multiple access scheme in the long term evolution of cellular systems under consideration by the third generation partnership project (3GPP). In this paper, we give an overview of SC-FDMA. We also analyze the effects of subcarrier mapping on throughput and PARR. Among the possible subcarrier mapping approaches, we find that localized FDMA (LFDMA) with channel-dependent scheduling (CDS) results in higher throughput than interleaved FDMA (JFDMA). However, the PARR performance of IFDMA is better than that of LFDMA. As in other communications systems there are complex tradeoffs between design parameters and performance in an SC-FDMA system
1,328 citations
TL;DR: It is demonstrated that non-orthogonal approaches have a spectral-power efficiency advantage over orthogonal ones for delay-sensitive applications in fading environments, and that this theoretical advantage can be realized in practice by exploiting recent progress in transmission and detection techniques.
Abstract: This article provides a comparative study of different multiple access techniques. It is demonstrated that non-orthogonal approaches have a spectral-power efficiency advantage over orthogonal ones for delay-sensitive applications in fading environments, and that this theoretical advantage can be realized in practice by exploiting recent progress in transmission and detection techniques. The practical aspects of these multiple access techniques are also discussed and compared
296 citations
TL;DR: It is demonstrated that non-orthogonal approaches have a spectral-power efficiency advantage over orthogonal ones for delay-sensitive applications in fading environments, and that this theoretical advantage can be realized in practice by exploiting recent progress in transmission and detection techniques.
Abstract: In the above named article (see IEEE Vehicular Technology Magazine, Volume 1, Issue 3, pp 4-11) Figure 2 in the article by Peng Wang, Jun Xiao and Li Ping, was printed incorrectly The correct figure, along with Figure 3, which was printed correctly, are reproduced here
166 citations
TL;DR: Long-range safety systems are needed with real-time detection capability and without requiring a line-of-sight (LOS) view by the driver or sensor to help avoid accidents.
Abstract: Many accidents occur today when distant objects or roadway impediments are not quickly detected. To help avoid these accidents, longer-range safety systems are needed with real-time detection capability and without requiring a line-of-sight (LOS) view by the driver or sensor. Early detection at intersections is required for obstacle location around blind corners and dynamic awareness of approaching vehicles on intersecting roadways
132 citations
Journal Article•
TL;DR: The East Corridor and Gold Line projects are now going to be reviewed for procurement under the process, which will simplify the application for federal funds by waiving the cost-effectiveness calculation requirements to the extent that private capital will be used since some of the risk is being transferred to the private partnership.
Abstract: East Corridor and Gold Line projects are now going to be reviewed for procurement under the process. A big advantage of the process is that the FTA (Federal Transit Administration) will simplify the application for federal funds by waiving the cost-effectiveness calculation requirements to the extent that private capital will be used since some of the risk is being transferred to the private partnership. The East Corridor is a proposed commuter rail line from downtown Denver to Denver International Airport. The Gold Line is an 11.2-mi-long proposed commuter rail line from downtown through northwest Denver on to Arvada and Wheat Ridge. Both lines had compared the use of diesel- powered multiple-unit equipment with electric-powered multiple-unit equipment. RTD (Regional Transit District) chose electric multiple-unit trains for both lines. Environmental impact statements are being progressed for each line.
99 citations
TL;DR: The chair of the Wireless World Research Forum, or WWRF, gives an introduction to the structure and purpose of the forum and presents the key technology vision for the wireless future: 7 trillion wireless devices serving 7 billion people by 2017.
Abstract: Mikko Uusitalo, chair of the Wireless World Research Forum, or WWRF, gives an introduction to the structure and purpose of the forum and presents the key technology vision for the wireless future: 7 trillion wireless devices serving 7 billion people by 2017
90 citations
TL;DR: In this paper, the authors illustrate the state of the art of smart antenna research from several perspectives, drawn from transmitter issues via channel measurements and modeling, receiver signal processing, network aspects, technological challenges towards first smart antenna applications and current status of standardization.
Abstract: Aim of this contribution is to illustrate the state of the art of smart antenna research from several perspectives. The bow is drawn from transmitter issues via channel measurements and modeling, receiver signal processing, network aspects, technological challenges towards first smart antenna applications and current status of standardization. Moreover, some future prospects of different disciplines in smart antenna research are given
80 citations
TL;DR: Emphasis is given on business model aspects, the management architecture and functionality for cognitive wireless networks, as well as on the related hardware aspects that enable reconfiguration.
Abstract: Wireless communications and IP networks will evolve into a new converged vision, which is called beyond the 3rd generation. This vision can be efficiently realized through the advent of cognitive networks. Cognitive wireless networks are capable of reconfiguring their infrastructure, based also on experience, in order to adapt to the continuously changing environment. Main reconfiguration actions, in the PHY/MAC layers, in the selection of the most appropriate technology and spectrum for operation. Such innovative concepts require a holistic combination of a variety of engineering disciplines. This paper addresses such issues. Emphasis is given on business model aspects, the management architecture and functionality for cognitive wireless networks, as well as on the related hardware aspects that enable reconfiguration
63 citations
TL;DR: A comprehensive overview of the TEDS features with particular emphasis on the physical layer and medium access control features together with representative link and system performance results is given.
Abstract: The TETRA enhanced data service (TEDS) standard has been developed within the Technical Committee TETRA of the European Telecommunications Standards Institute as a major upgrade to the existing narrow-band ETSI TETRA system to supply professional users with high-speed IP packet data services over wireless mobile channels. Multicarrier-based modulation format, powerful payload and header encoding and link adaptation methods are among techniques employed for this purpose. The above enhancements are efficiently combined with improved higher layer protocols enabling a number of new services such as multiple multimedia access with QoS re-negotiation during the session, various priority mechanisms, provision of scheduled access for delay-sensitive applications and support for sectored antenna usage. The aim of this paper is to give a comprehensive overview of the TEDS features with particular emphasis on the physical layer and medium access control features together with representative link and system performance results
38 citations
TL;DR: A combination of MIMO, OFDM and TDD is a promising candidate technology to meet the demands for ever higher data rates in next generation wireless systems, but realizing the potential gains of this approach requires tackling a number of new challenges.
Abstract: As RF and baseband engineers strive to satisfy the demand for ever higher data rates in next generation wireless systems, they are faced with three challenging requirements: both spectral efficiency and bandwidth have to be increased, and the cost per bit has to be kept low. A combination of MIMO, OFDM and TDD is a promising candidate technology to meet these objectives. However, realizing the potential gains of this approach requires tackling a number of new challenges: real MIMO channels, real-"Dirty"-RF and tough real-time constraints
28 citations
TL;DR: This paper considers multi-mode terminals from both the algorithm and the architecture viewpoint, reducing receiver complexity by taking advantage of the commonalities among different specifications and receiver requirements.
Abstract: The increasing demand for wireless based services continues to grow with a multiplicity of standards developing. This is driving a need to develop integrated mobile terminals which have multi-mode capabilities, i.e., multiple communication systems which can coexist. The attention of this paper is focused on the coexistence of multiple communication systems via a simple hardware based structure with the algorithms and architectures developed within the framework of multi-mode terminals. The term multi-mode in this paper is limited to a set of standards and to a receiver that is expected to handle different systems with a low hardware complexity. Dedicated hardware is shared and reused by different systems. Existing specifications DAB, DVB-T, HIPERLAN-2 and UMTS are considered as examples in this paper, although the methodology could be applied to other systems. The systems considered can be classified into two categories: multi-carrier systems and single-carrier systems. This paper considers multi-mode terminals from both the algorithm and the architecture viewpoint, reducing receiver complexity by taking advantage of the commonalities among different specifications and receiver requirements. As an example, a joint channel estimation, chip-level frequency domain equalization and parallel interference cancellation structure for WCDMA is presented
TL;DR: A novel OCC-CDMA/OS physical layer architecture is proposed in this paper for its possible applications in futuristic wireless networks, showing that many advanced operational requirements in future 4G networks will make all current CDMA technologies unsuitable due to their rigid and voice-centricPhysical layer architecture.
Abstract: This paper starts with a review of 2G-3G CDMA based wireless systems from a network operation perspective. In particular, the challenges faced by current CDMA technologies will be addressed with the focus on their possible applications in 4G wireless networks. We will show that many advanced operational requirements in future 4G networks, such as high-speed bunt traffic, cross-layer network design, seamless integration of different net works with and without infrastructure, will make all current CDMA technologies unsuitable due to their rigid and voice-centric physical layer architecture. To respond to the call for CDMA innovation, a novel OCC-CDMA/OS physical layer architecture is proposed in this paper for its possible applications in futuristic wireless networks. One of the most important features of OCC-CDMA/OS physical layer architecture is its unique elasticity, which facilitates implementation of a fully-adaptive CDMA transceiver to work harmonically with various advanced upper-layer designs in 4G networks Many other technical issues on CDMA based 4G networks will also be discussed It is concluded that OCC-CDMA/OS has a great potential for its applications in future 4G wireless networks
TL;DR: A novel architecture is described to enable user friendly establishment of a secure communication among mobile devices to share data using different wireless technologies like wireless LAN, Bluetooth, cellular systems or even infrared.
Abstract: How can secure data communication between two users not knowing each other be achieved? In this paper we show that it is possible to perform such a secured communication using a user friendly setup with help of a cellular network. The main contribution of this paper is to present a secure connection between two users on whatever technology (wireless LAN, Bluetooth, etc) with an easy installation and setup reusing a cellular network. We describe a novel architecture to enable user friendly establishment of a secure communication among mobile devices to share data using different wireless technologies like wireless LAN, Bluetooth, cellular systems or even infrared. Making use of these technology combinations for data transmission and using the cellular network for signaling, we analyze several scenarios with increasing complexity. The complete picture appears in the last scenario where several heterogeneous technologies are involved and the network is composed of heterogeneous mobile nodes. The novelty of our concept is mainly the usage of wireless WAN networks to authenticate users and exchange keys to secure the heterogeneous links between the mobile nodes
TL;DR: The author discusses various aspects of developments in the field of 3G communications and HSDPA, including: heterogeneous wireless communications, WiMAX and WLAN, mobile TV, health issues, location based services and e-commerce based services, spectrum licences, forums and industry alliances, the US market and industrial forecasts.
Abstract: The author discusses various aspects of developments in the field of 3G communications and HSDPA, including: heterogeneous wireless communications, WiMAX and WLAN, mobile TV, health issues, location based services and e-commerce based services, spectrum licences, forums and industry alliances, the US market and industrial forecasts
TL;DR: A CDD based "space time/space-frequency (ST/SF) block coded" diversity transmitter for MC-CDMA system that provides excellent spatial and frequency diversity which is otherwise impossible to realize with standalone CDD or block codes.
Abstract: Spatial diversity techniques will inarguably play an important role in the realization of B3G wireless systems, which promise higher data transmission rates and affluent multi-media contents. In this article, we present a CDD based "space time/space-frequency (ST/SF) block coded" diversity transmitter for MC-CDMA system. Equipped with CDD a fraction of the total number of transmit antennas is used to extract the frequency (multipath) diversity while the remaining antennas employing ST/SF-block codes provide maximum spatial diversity. This hybrid architecture makes full use of the frequency domain spreading of MC-CDMA system and provides excellent spatial and frequency diversity which is otherwise impossible to realize with standalone CDD or block codes
TL;DR: This article reviews possible solutions for distributed code assignment in UWB networks, and investigates two effective approaches, namely spatial exclusion and temporal exclusion, for interference control in UWBs.
Abstract: Ultra-wideband (UWB) technology is a viable candidate for next generation wireless communications, with merits such as high data rate, low power, robustness to multipath fading, and positioning capability. Multiple nearby transmissions can be supported in UWB networks, using an appropriate code assignment mechanism. Different from cellular networks, the near-far problem in UWB networks cannot be solved solely by power control at the physical layer. Instead, it should be managed jointly with: the radio resource allocation at the link layer in order to: achieve interference control. This article reviews possible solutions for distributed code assignment in UWB networks, and investigates two effective approaches, namely spatial exclusion and temporal exclusion, for interference control in UWB networks
TL;DR: Working together with Intel, Motorola and Samsung, Sprint Nextel will develop a nationwide network infrastructure as well as mobile WiMAX-enabled chipsets that will support advanced wireless broad band services for computing, portable multimedia, interactive and other consumer electronic devices.
Abstract: Sprint Nextel has announced its plans to develop and deploy what it claims will be the first 4G nationwide broadband mobile network. The 4G wireless broadband network will use the mobile WiMAX (worldwide interoperability for microwave access) IEEE 802.16e-2005 technology standard. Working together with Intel, Motorola and Samsung, Sprint Nextel will develop a nationwide network infrastructure as well as mobile WiMAX-enabled chipsets that will support advanced wireless broad band services for computing, portable multimedia, interactive and other consumer electronic devices
TL;DR: In this article, the authors describe how the world moves toward beyond 3G communications and also many services have been used such as: WCDMA, HSDPA, UMTS, mobile TV, and Bluetooth etc.
Abstract: This paper describes how the world moves toward beyond 3G communications and also many services have been used such as: WCDMA, HSDPA, UMTS, mobile TV, and Bluetooth etc. This paper also presents the industrial forecasting and surveys of the 3G communications
TL;DR: HD radio technology will provide platform-specific customer retention information, real-time traffic for navigation system overlay, PVR-like functionality, on-demand audio, mobile commerce and much more, dramatically upgrading automobile manufacturers' ability to reach and profit from radio's 200 million listeners per day.
Abstract: AM and FM radio has long been the primary source of mobile entertainment and information. Radio's conversion to digital broadcasting through deployment of the FCC approved HD radio technology with drive new and innovative telematics services. In the digital world, the radio will be transformed to a centralized source of expanded entertainment and information services along with enhanced in-vehicle systems. At a fraction of the cost of other wireless services, HD radio technology will provide platform-specific customer retention information, real-time traffic for navigation system overlay, PVR-like functionality, on-demand audio, mobile commerce and much more, dramatically upgrading automobile manufacturers' ability to reach and profit from radio's 200 million listeners per day
TL;DR: The VPPC organized the first IEEE Vehicle Power and Propulsion Conference on September 7–9, 2005 in Chicago Illinois, sponsored by the IEEE VTS and Power Electronics Society (PELS), with the technical co-sponsorship of IEEE Industry Applications Society (IAS).
Abstract: The VPPC organized the first IEEE Vehicle Power and Propulsion Conference on September 7–9, 2005 in Chicago Illinois, on the campus of Illinois Institute of Technology, sponsored by the IEEE VTS and Power Electronics Society (PELS), with the technical co-sponsorship of IEEE Industry Applications Society (IAS). This event was another major VPPC success and doubled the size of the previous year’s VPPC event, for the fifth year in a row. The conference was co-located with the SAE Future Transportation Technology (FTT) conference. This co-location served both IEEE and SAE in this vital technical field by drawing specialists from both of these bodies to meet and exchange knowledge. It also laid the foundation for similar future cooperation. To better handle the future growth and co-sponsorship of this conference by VTS and PELS, some changes have been made in the configuration of management of VPPC and approved by both VTSBoG and PELS-AdCom, as follows. The VPPC Committee of VTS is being merged with the PELS committee for the Workshop on Power Electronics in Transportation (WPET). A steering committee of VPPC was created to serve as the executive body of VPPC. Five members were appointed to serve on this committee, with balanced representations from both VTS and PELS, as follows, Prof. A. Emadi, member (VTS) Prof. B. Fahimi, member (VTS) Prof. J. Shen, member (PELS) Dr. R. Frank, member (PELS) Prof. M. Ehsani, Chair, serving on both VTS BoG and PELS AdCom.
TL;DR: A service taxonomy, enabling middleware technologies, and service enablers are introduced for providing trustworthy applications through wireless networks in vehicular environments to maintain end users privacy when providing personalized, context-aware services.
Abstract: The integration of ICT in vehicular environments enables new kinds of application and creates new technological challenges. Dynamic, network topology, unreliable network links, and moving terminals make it hard to provide a convincing end user experience. This article introduces the concept of providing trustworthy applications through wireless networks in vehicular environments. A special emphasis will be on how to maintain end users privacy when providing personalized, context-aware services. Therefore, a service taxonomy, enabling middleware technologies, and service enablers are introduced
TL;DR: The private Italian railway company, Rail Traction Company (RTC) has agreed to purchase five multi-system ES64F locomotives which it had leased from Siemens two years ago.
Abstract: Rail Traction Company Buys ES64F Locomotives The private Italian railway company, Rail Traction Company (RTC) has agreed to purchase five multi-system ES64F locomotives which it had leased from Siemens two years ago. These locomotives have been used on the Verona to Munich route via the Brenner Pass route through Austria. The ES64F can operate on four different overhead power supplies: 15 kV 16.7 Hz, 25 kV 50 Hz, 3 kV dc, and 1.5 kV dc using IGBT drive.
TL;DR: A number of enabling technologies, such as smart antennas and relay-based systems, that help address the challenges in the design of a new air interface are presented, and critical parameters and open issues are discussed.
Abstract: The wide variety of envisioned data services and the requirements for transparent operation across different technologies, adaptivity to varying network conditions and quality of service (QoS) constraints introduce a number of challenges in the design of future generation systems and the specification of a new air interface, such as efficiency in the utilization of spectrum, dynamic resource allocation and interference management Air interfaces will likely be reconfigurable, based on frequency domain transmission and reception methods, and adaptively selecting the uplink and downlink modulation and multiple access scheme that is most appropriate for the channel, interference, traffic and cost constraints In this paper the challenges in the design of a new air interface are analyzed, a number of enabling technologies, such as smart antennas and relay-based systems, that help address these challenges, are presented, and critical parameters and open issues are discussed
TL;DR: Beyond 3G Option announced it has successfully completed what it claims is the industry’s first demonstration of live HSUPA (High Speed Uplink Packet Access) data card calls reaching a wireless uplink transmission rate of 1.3 Mbps and a wireless downlink of 2.7 Mbps.
Abstract: Beyond 3G Option announced it has successfully completed what it claims is the industry’s first demonstration of live HSUPA (High Speed Uplink Packet Access) data card calls reaching a wireless uplink transmission rate of 1.3 Mbps and a wireless downlink of 2.7 Mbps at application level. A laptop fitted with an Option HSUPA data card based on Qualcomm’s MSM7200 chipset and commercial HSDPA/ HSUPA network equipment from Nortel were used to achieve the new record data speeds. HSUPA enhances the data speed in the uplink up to a theoretical maximum of 5.7 Mbps, from the 384 kbps currently available with HSDPA. Higher performance is achieved through more efficient uplink scheduling in the base station and faster retransmission control. The HSUPA and HSDPA calls were also conducted in a car while driving at 50 km/h. Commercial availability of “HSUPA-Ready” and full HSUPA products from Option are planned for the first half of 2007. SmarTone-Vodafone and Ericsson announced that what they claim is the world’s first 3.6 Mbps HSDPA full-coverage network has gone live. The Hong Kong-based mobile operator plans to further upgrade the network to a maximum speed of 14.4 Mbps in 2007–2008.
TL;DR: The Taipei Rapid Transit System program is presented to replace the original DC motor drive of the medium capacity transit system trains with modern IGBT circuitry, improving service reliability and life expectancy.
Abstract: In this paper we present the Taipei Rapid Transit System program to replace the original DC motor drive of the medium capacity transit system trains with modern IGBT circuitry. The medium capacity transit system fleet employed traction power circuit designed in the 1980s, which soon suffered from high failure rate long before midlife overhaul. With modern power electronics technology, we replace the cumbersome drive circuitry for current-controlled power transistors by simple and straightforward gate drive circuit for voltage-controlled IGBTs. Also a large number of discrete components found on the original board are replaced by modules and ICs, improving service reliability and life expectancy
Journal Article•
TL;DR: Aptiv as mentioned in this paper verkauf 400 million US-Dollar zuzüglich einer variablen Komponente von 50 Millionen USDollar.
Abstract: Mit der Übernahme von nuTonomy, einem Entwickler von autonomen Fahrlösungen aus Boston (USA), krönte Aptiv (vormals Delphi ohne die abgespaltene Antriebsstrangsparte) 2017 seine Bemühungen, sich von einem traditionellen Komponentenzulieferer in einen Anbieter von Hightech-Lösungen zu transformieren. Der Kaufpreis betrug 400 Millionen US-Dollar zuzüglich einer variablen Komponente von 50 Millionen US-Dollar. Doch die Markteinführung neuer Technologien im Bereich autonomes Fahren (AF) zeigt sich als deutlich schwieriger und teurer. Für eine erfolgreiche Umsatzgenerierung werden noch mindestens fünf Jahre benötigt. Aufgrund knapper Finanzmittel hat Aptiv die Hälfte seines SAE-Level-4-Projeks für 2 Milliarden US-Dollar an Hyundai verkauft: gesplittet in 1,6 Milliarden US-Dollar in bar sowie 400 Millionen US-Dollar an F&E-Ressourcen, die Hyundai in das neue 50 50-Joint-Venture (JV) einbringen wird. Die Finanzmittel sollen dem JV als Basis für die nächsten Jahre dienen. Laut Aptiv soll die Mitarbeiterzahl von 800 im Mai auf 1000 bis Ende 2020 steigen. Das JV verfügt © s ch ar fs in n 8 6 | st oc k. ad ob e. co m