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Vertical handover for 4G multi-standard wireless transceivers
KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.ORCID iD: 0000-0003-3802-7834
KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
2007 (English)In: 2007 14TH IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS, CIRCUITS AND SYSTEMS: VOLS 1-4, 2007, 1356-1359 p.Conference paper, Published paper (Refereed)
Abstract [en]

Future best-connected wireless solutions will involve a multitude of network standards between which the user can switch in order to optimize a set of benefits such as cost and performance. As a result of this convergence, the hardware design of the mobile device will require knowledge about the restrictions imposed by the upper networking layers. This paper starts by presenting the requirements for the connection initialization in the WLAN, WiMAX and 3G standards as they pertain to the mobile transceiver design. It is assumed that the mobile device is based on the dual front-end transceiver architecture where the primary transceiver handles the current network connection while the secondary transceiver (Sniffer) searches for an alternative connection. The paper also presents the handover procedures between these standards that will provide, among other things, the timing requirements for the circuit design.

Place, publisher, year, edition, pages
2007. 1356-1359 p.
Series
IEEE International Conference on Electronics, Circuits and Systems
Keyword [en]
Computer networks; Integrated circuit manufacture; Local area networks; Mobile devices; Networks (circuits); Object recognition; Portable equipment; Radio systems; Standards; Switching circuits; Telecommunication equipment; Timing circuits; Transceivers; Wireless local area networks (WLAN); Wireless telecommunication systems; Hardware designs; International conferences; Network standards; Wireless transceivers
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-13986DOI: 10.1109/ICECS.2007.4511250ISI: 000255014801159Scopus ID: 2-s2.0-50649122512OAI: oai:DiVA.org:kth-13986DiVA: diva2:328839
Conference
14th IEEE International Conference on Electronics, Circuits and Systems, Marrakech, MOROCCO, DEC 11-14, 2007
Note
QC 20100706Available from: 2010-07-06 Created: 2010-07-06 Last updated: 2010-07-06Bibliographically approved
In thesis
1. Integrated Frequency Synthesis for Convergent Wireless Solutions
Open this publication in new window or tab >>Integrated Frequency Synthesis for Convergent Wireless Solutions
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Wireless transceivers combining several standards in one unit are of key importance. In order to reach the ultimate goal of maximizing the performance-to-cost ratio of such modules, a careful study of the target application, the architecture, and the frequency planning is strongly required. One of the most challenging tasks is the implementation of the frequency synthesizer. This challenge is compounded by the traditional technical difficulties in designing frequency synthesizers as well as the new requirements that include multi-standard support. As a result, studying the upper levels of the communication system becomes mandatory in order to frame the requirements of the frequency synthesizer and to provide a viable solution from a user’s perspective for an always-best-connected scenario. Additionally, the study of the upper layers opens up new opportunities for innovation at the lower layers, especially at the physical layer where the view is traditionally restricted by some harsh requirements whose source might not be clear at least for the physical-level designer. The first aim of this work is to provide a holistic view of how an optimum user experience can be achieved and how this affects the design of frequency synthesizers for the next generation networks. The work is heavily based on the existing garden of wireless standards although it can also serve for other applications such as real software-defined radios and dynamic spectrum allocation. As a result, this work cuts a vertical path starting from the best user experience vision down to the physical layer where it expands on the design of the frequency synthesizer. It proposes a wireless front-end solution that can make the vision of an always-best-connected scenario a reality. The architecture is based on a wireless detector called Sniffer that searches for an alternative connection while the main connection is running. Not only is the Sniffer solution viable at the physical level, but it also provides a stepping stone for development towards fully-enabled multi-standard transceivers. After this, and inline with the previous vision, some important frequency synthesizer parameters are pointed out and enhancements on the phase-locked architectures are presented. This includes ways to extend the range of the frequency synthesizer and ways to make the synthesizer adaptable depending on the requirements of the wireless standards. This work leads directly to the implementation of a multi-standard frequency synthesizer where the details of the top-down design procedure are presented at several levels of abstraction. In order to round-up the work, and due to the fact that the requirements of the frequency synthesizer stretch thin the capabilities of the technology used, calibration techniques to increase the yield of such a complicated sub-system are presented, an important step towards first-pass success.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. xviii, 182 p.
Series
Trita-ICT-ECS AVH, ISSN 1653-6363 ; 08:07
Keyword
wireless, transceiver, Bluetooth, DECT, GSM, 3G, LTE, WLAN, WiMAX, multi-standard, vertical handover, Sniffer, frequency synthesizer, phase-locked loop, PLL, sigma-delta, calibration
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-9486 (URN)978-91-7415-142-8 (ISBN)
Public defence
2008-11-20, sal D, Forum, KTH, Isafjordsgatan 39, Kista, 14:00 (English)
Opponent
Supervisors
Note
QC 20100706Available from: 2008-11-10 Created: 2008-11-07 Last updated: 2010-07-06Bibliographically approved

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