Sat, 26 Jul 2008 06:07:09 BST CiteULike: dcastro's access http://www.citeulike.org/user/dcastro/tag/access CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/1939685 <i>Wireless Communications, IEEE [see also IEEE Personal Communications], Vol. 11, No. 2. (2004), pp. 14-22.</i> Ambient networks: an architecture for communication networks beyond 3G N Niebert A Schieder H Abramowicz G Malmgren J Sachs U Horn C Prehofer H Karl doi:10.1109/MWC.2004.1295733 Wireless Communications, IEEE [see also IEEE Personal Communications], Vol. 11, No. 2. (2004), pp. 14-22. 2007-11-19T21:31:38-00:00 2004 Wireless Communications, IEEE [see also IEEE Personal Communications] 11 2 14 22 access network wireless http://www.citeulike.org/user/dcastro/article/1699772 <i>Wireless Communications, IEEE [see also IEEE Personal Communications], Vol. 10, No. 1. (2003), pp. 49-55.</i><br /><br />Over the last few years, we have experienced a variety of access technologies being deployed. While 2G cellular systems evolve into 3G systems such as UMTS or cdma2000, providing worldwide coverage, wireless LAN solutions have been extensively deployed to provide hotspot high-bandwidth Internet access in airports, hotels, and conference centers. At the same time, fixed access such as DSL and cable modem tied to wireless LANs appear in home and office environments. The always best connected (ABC) concept allows a person connectivity to applications using the devices and access technologies that best suit his or her needs, thereby combining the features of access technologies such as DSL, Bluetooth, and WLAN with cellular systems to provide an enhanced user experience for 2.5G, 3G, and beyond. An always best connected scenario, where a person is allowed to choose the best available access networks and devices at any point in time, generates great complexity and a number of requirements, not only for the technical solutions, but also in terms of business relationships between operators and service providers, and in subscription handling. This article describes the concept of being always best connected, discusses the user experience and business relationships in an ABC environment, and outlines the different aspects of an ABC solution that will broaden the technology and business base of 3G. Always best connected E Gustafsson A Jonsson doi:10.1109/MWC.2003.1182111 Wireless Communications, IEEE [see also IEEE Personal Communications], Vol. 10, No. 1. (2003), pp. 49-55. 2007-09-27T09:45:35-00:00 2003 Wireless Communications, IEEE [see also IEEE Personal Communications] 10 1 49 55 access network wireless http://www.citeulike.org/user/dcastro/article/2883744 <i>Communications Magazine, IEEE, Vol. 41, No. 7. (2003), pp. 58-65.</i><br /><br />At present, WLANs supporting broadband multimedia communications are being developed and deployed around the world. Standards include HIPERLAN/2 defined by ETSI BRAN and the 802.11 family defined by the IEEE. These systems provide channel adaptive data rates up to 54 Mb/s (in a 20 MHz channel spacing) over short ranges up to 200 m. The HIPERLAN/2 standard also specifies a flexible radio access network that can be used with a variety of core networks, including UMTS. It is likely that WLANs will become an important complementary technology to 3G cellular systems and will typically be used to provide hotspot coverage. In this article the complementary use of WLANs in conjunction with UMTS is presented. In order to quantify the capacity enhancement and benefits of cellular/hotspot interworking we have combined novel ray tracing, software-simulated physical layer performance results, and optimal base station deployment analysis. The study focuses on an example deployment using key lamppost mounted WLAN access points to increase the performance (in terms of capacity) of a cellular network. Hotspot wireless LANs to enhance the performance of 3G and beyond cellular networks A Doufexi E Tameh A Nix S Armour A Molina doi:10.1109/MCOM.2003.1215640 Communications Magazine, IEEE, Vol. 41, No. 7. (2003), pp. 58-65. 2008-06-11T20:21:43-00:00 2003 Communications Magazine, IEEE 41 7 58 65 3g access cellular network wireless http://www.citeulike.org/user/dcastro/article/755253 <i>Selected Areas in Communications, IEEE Journal on, Vol. 18, No. 8. (2000), pp. 1344-1354.</i><br /><br />To satisfy ever-increasing demands for higher data rates, as well as to allow more users to simultaneously access the network, interest has peaked in what has come to be known as wideband code division multiple access (WCDMA). We discuss those basic characteristics of WCDMA waveforms that make them attractive for high data rate transmission over wireless and mobile channels. We emphasize how the choice of spread bandwidth affects the bit error rate of the system, as well as how it affects the reliability of various subsystems, such as those that perform coarse acquisition and adaptive power control. We then discuss how some of the waveforms being considered for cellular WCDMA systems differ from those in use in the narrowband CDMA cellular system, and emphasize, as an example, multicarrier CDMA. Finally, we discuss other potential enhancements to WCDMA systems, such as the use of interference suppression at the receiver, or multiple antennas at the transmitter Wideband code division multiple access LB Milstein doi:10.1109/49.864000 Selected Areas in Communications, IEEE Journal on, Vol. 18, No. 8. (2000), pp. 1344-1354. 2006-07-12T18:41:14-00:00 2000 Selected Areas in Communications, IEEE Journal on 18 8 1344 1354 access cdma multiple wideband http://www.citeulike.org/user/dcastro/article/2802224 <i>Communications, IEEE Transactions on [legacy, pre - 1988], Vol. 25, No. 8. (1977), pp. 795-799.</i><br /><br />An analysis of an asynchronous phase-coded spread-spectrum multiple-access communication system is presented. The results of this analysis reveal which code parameters have the greatest impact on communication performance and provide analytical tools for use in preliminary system design. Emphasis is placed on average performance rather than worst-case performance and on code parameters which can be computed easily. Performance Evaluation for Phase-Coded Spread-Spectrum Multiple-Access Communication--Part I: System Analysis M Pursley Communications, IEEE Transactions on [legacy, pre - 1988], Vol. 25, No. 8. (1977), pp. 795-799. 2008-05-15T17:46:41-00:00 1977 Communications, IEEE Transactions on [legacy, pre - 1988] 25 8 795 799 access communication multiple spread-spectrum http://www.citeulike.org/user/dcastro/article/2011511 <i>Communications Magazine, IEEE, Vol. 43, No. 2. (2005), pp. 110-117.</i><br /><br />In this article, some fundamental technical concepts of the main multiple access schemes for wireless mobile systems are reviewed, and a path for the development of appropriate multiple access technologies for next-generation mobile networks, or so-called beyond 3G (B3G), is established. We first review the multiple access technologies in second- and third-generation wireless cellular systems from historical and technical points of view. This review is followed by a novel formulization of the multiple access schemes through mathematical expressions that could simplify the process of development of new multiple access schemes for B3G wireless cellular systems. We then list the most important features of multiple access schemes in 3G mobile systems. Finally, we conclude the article by reviewing the most promising multiple access technologies for B3G mobile cellular systems. A tutorial on multiple access technologies for beyond 3G mobile networks A Jamalipour T Wada T Yamazato doi:10.1109/MCOM.2005.1391509 Communications Magazine, IEEE, Vol. 43, No. 2. (2005), pp. 110-117. 2007-11-29T07:44:59-00:00 2005 Communications Magazine, IEEE 43 2 110 117 access mobile multiple network tutorial http://www.citeulike.org/user/dcastro/article/2693245 <i>Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on (2007), pp. 1-5.</i><br /><br />A propagation model which combines the Fresnel zone theory and the ray tracing techniques is presented in this paper. The aim of this novel approach is a more accurate representation of the Fixed Wireless Access channel. Deterministic models do not consider power loss when the radio waves propagate close to roof tops. However, according to the theory of the Fresnel zones, even when there is line-of-sight (LOS), the loss can be as much as 6dB due to a single obstacle just below the LOS. In the model presented here, the path of each ray is found by a three-dimensional (3D) ray tracing algorithm and the electromagnetic field of each ray is calculated according to Geometric Optics (GO) and the Uniform Theory of Diffraction (UTD). The first Fresnel zone of each ray is also found and examined and the losses due to its partial blockage are taken into account. Simulation results show significant differences in the power predictions when the blockage of the Fresnel zones is considered. Incorporating the Fresnel Zone Theory in Ray Tracing for Propagation Modelling of Fixed Wireless Access Channels Georgia Athanasiadou doi:10.1109/PIMRC.2007.4394753 Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on (2007), pp. 1-5. 2008-04-20T16:25:30-00:00 2007 Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on 1 5 access channel model propagation ray http://www.citeulike.org/user/dcastro/article/2693241 <i>Communications Magazine, IEEE, Vol. 35, No. 1. (1997), pp. 20-26.</i><br /><br />This article reviews the technologies and potential markets, applications, and architectures for broadband wireless access. The emergence of wireless communications for cellular systems is presented, together with its projected future evolution to mobile wideband systems. The field of broadband access systems, services, and network architectures is also covered, and then systems for broadband wireless communications for indoor local area networks and outdoor public fixed access networks are discussed. Broadband wireless access systems are emerging as a new and growing area of telecommunications, since the ability to provide access without extensive installation of copper or fiber infrastructures make wireless technology well suited for broadband services. Finally, some of the key enabling technologies, such as adaptive antennas and video compression, and the future architectural directions of broadband wireless networks are presented Broadband wireless access W Honcharenko JP Kruys DY Lee NJ Shah doi:10.1109/35.568192 Communications Magazine, IEEE, Vol. 35, No. 1. (1997), pp. 20-26. 2008-04-20T16:24:02-00:00 1997 Communications Magazine, IEEE 35 1 20 26 access broadband wireless http://www.citeulike.org/user/dcastro/article/963379 <i>Communications Magazine, IEEE, Vol. 43, No. 2. (2005), pp. 80-87.</i><br /><br />Ultra-wideband wireless communications techniques have many merits, including an extremely simple radio that inherently leads to low-cost design, large processing gain for robust operations in the presence of narrowband interference, covert operations, and fine time resolution for accurate position sensing. However, there are a number of challenges in UWB receiver design, such as capturing multipath energy, intersymbol interference especially in a non-line-of-sight environment, and the need for high-sampling-rate analog-to-digital converters. In this article, we provide a comprehensive review of UWB multiple access and modulation schemes, and their comparison with narrowband radios. We also outline the issues with UWB signal reception and detection, and explore various suboptimal low-complexity receiving schemes. Ultra-wideband for multiple access communications RC Qiu H Liu X Shen doi:10.1109/MCOM.2005.1391505 Communications Magazine, IEEE, Vol. 43, No. 2. (2005), pp. 80-87. 2006-11-27T14:36:00-00:00 2005 Communications Magazine, IEEE 43 2 80 87 access communication multiple uwb http://www.citeulike.org/user/dcastro/article/2652786 <i>Communications Magazine, IEEE, Vol. 38, No. 7. (2000), pp. 78-87.</i><br /><br />The rapid growth of wireless voice subscribers, the growth of the Internet, and the increasing use of portable computing devices suggest that wireless Internet access will rise rapidly over the next few years. Rapid progress in digital and RF technology is making possible highly compact and integrated terminal devices, and the introduction of sophisticated wireless data software is making wireless Internet access more user-friendly and providing more value. Transmission rates are currently only about 10 kb/s for large cell systems. Third-generation wireless access such as WCDMA and the evolution of second-generation systems such as TDMA IS-136+, EDGE, and CDMA IS-95 will provide nominal bit rates of 50-384 kb/s in macrocellular systems. This article discusses packet data transmission rates of 2-5 Mb/s in macrocellular environments and up to 10 Mb/s in microcellular and indoor environments as a complementary service to evolving second- and third-generation wireless systems. Dynamic packet assignment for high-efficiency resource management and packet admission; OFDM at the physical layer with interference suppression, space-time coding, and frequency diversity; as well as smart antennas to obtain good power and spectral efficiency are discussed in this proposal. Flexible allocation of both large and small resources also permits provisioning of services for different delay and throughput requirements Beyond 3G: wideband wireless data access based on OFDM and dynamic packet assignment J Chuang N Sollenberger doi:10.1109/35.852035 Communications Magazine, IEEE, Vol. 38, No. 7. (2000), pp. 78-87. 2008-04-11T07:34:49-00:00 2000 Communications Magazine, IEEE 38 7 78 87 3g access data ofdm wideband wireless http://www.citeulike.org/user/dcastro/article/2426151 <i>Communications Magazine, IEEE, Vol. 40, No. 4. (2002), pp. 76-83.</i><br /><br />Broadband wireless access along with evolving mobile Internet and multimedia services are driving the surge of research and development activities for future wireless communication systems. We provide an overview of antenna systems for broadband wireless communications and introduce some of the important issues surrounding them. The approach we use is to first provide a general framework of how antenna systems may be utilized in wireless communication systems and then describe the antenna systems themselves. In particular, we consider antenna systems for the base station, mobile station, and then finally multiple-input multiple-output antenna systems where antenna systems are utilized at both the base and mobile stations Antenna systems for broadband wireless access RD Murch KB Letaief doi:10.1109/35.995854 Communications Magazine, IEEE, Vol. 40, No. 4. (2002), pp. 76-83. 2008-02-25T17:51:38-00:00 2002 Communications Magazine, IEEE 40 4 76 83 access antenna broadband wireless http://www.citeulike.org/user/dcastro/article/2072427 <i>Communications Engineer, Vol. 2, No. 5. (2004), pp. 36-39.</i> WiMAX in-depth [Broadband wireless access] P Piggin Communications Engineer, Vol. 2, No. 5. (2004), pp. 36-39. 2007-12-07T10:21:39-00:00 2004 Communications Engineer 2 5 36 39 access broadband wimax wireless http://www.citeulike.org/user/dcastro/article/2072365 <i>Communications Magazine, IEEE, Vol. 40, No. 4. (2002), pp. 96-103.</i><br /><br />Broadband wireless access is the most challenging segment of the wireless revolution since it has to demonstrate a viable alternative to the cable modem and DSL technologies that are strongly entrenched in the last mile access environment. The Analysis, Research, and Consultancy (ARC) Group forecasts that the fixed wireless deployments in both homes and businesses will reach almost 28 million by 2005, with North America and Western Europe accounting for 24 percent and 27 percent of these, respectively. Whether the promise of BWA will materialize depends on its appeal to telecom operators from the perspective of deployment economics, where the critical factor is the ease of installation of broadband wireless subscriber units. This ultimately leads to nonprofessional installation of integrated all-indoor BWSUs. Consequently the physical layer (PHY) has to mitigate the very tough impairments that characterize these non-line-of-sight environments. In this context we overview the work of the one of the IEEE 802.16 standard subcommittee projects that deals with a BWA solution based on OFDM access (OFDMA) aiming at the most challenging NLOS scenarios Broadband wireless access solutions based on OFDM access in IEEE 802.16 I Koffman V Roman doi:10.1109/35.995857 Communications Magazine, IEEE, Vol. 40, No. 4. (2002), pp. 96-103. 2007-12-07T09:54:03-00:00 2002 Communications Magazine, IEEE 40 4 96 103 80216 access broadband ofdm wireless http://www.citeulike.org/user/dcastro/article/2067732 <i>Communications Magazine, IEEE, Vol. 39, No. 1. (2001), pp. 100-108.</i><br /><br />This article provides an overview of fixed broadband wireless access technology. Focusing on the band below 3 GHz, we describe BWA service and carrier needs, deployment scenarios, architectural requirements, physical layer, medium access control, and radio link protocol requirements. We characterize fixed BWA channels, outline the major challenges of fixed BWA, and study requirements for future BWA systems. Finally, we show that the use of multiple antennas at both ends of a fixed wireless link provides significant leverages Fixed broadband wireless access: state of the art, challenges, and future directions H Bolcskel AJ Paulraj KVS Hari RU Nabar WW Lu Communications Magazine, IEEE, Vol. 39, No. 1. (2001), pp. 100-108. 2007-12-06T17:04:35-00:00 2001 Communications Magazine, IEEE 39 1 100 108 80216 access broadband wimax wireless http://www.citeulike.org/user/dcastro/article/2067697 <i>Communications, 2006. APCC '06. Asia-Pacific Conference on (2006), pp. 1-5.</i><br /><br />IEEE 802.16e is an emerging standard for mobile wireless broadband access systems. In any mobile networks, power saving is one of the most important features for the extension of devices' lifetime. In this paper, we introduce the sleep-mode operation of IEEE 802.16e and parameters related to this operation. Then, we adapt these parameters according to different traffic types for efficient power saving. For CBR traffic, by setting a proper initial-sleep window size, the maximum delay can be guaranteed while saving the average power consumption. For FTP traffic, by sleeping during queue-empty periods, the throughput performance is barely sacrificed while efficient power saving is accomplished Adaptive Power Saving Strategies for IEEE 802.16e Mobile Broadband Wireless Access Jaehyuk Jang Kwanghun Han Sunghyun Choi Communications, 2006. APCC '06. Asia-Pacific Conference on (2006), pp. 1-5. 2007-12-06T16:57:47-00:00 2006 Communications, 2006. APCC '06. Asia-Pacific Conference on 1 5 80216 access adaptive broadband mobile power wireless