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Packet-by-packet Radio Resource Management by means of Dynamic Single Frequency Networks
KTH, Superseded Departments, Signals, Sensors and Systems.
Mid Sweden University.
2000 (English)Conference paper (Refereed)
Abstract [en]

By combining a cellular system with the terrestrial digital video broadcasting system (DVB-T), wide-area asymmetric Internet access can be achieved, with a downlink peak bit rate of 10-20Mbps. In this paper, we study dynamic resource management on a packet-by-packet basis for this broadband downlink. A model for best-effort traffic is proposed, which simplifies the evaluation of maximum throughput and fairness. Dynamic Single Frequency Networks (DSFN) are evaluated, which exploits the macrodiversity capability of the OFDM modulation scheme. The transmitters are divided into single frequency networks (SFNs), i.e. groups of transmitters that send the same information at the same channel frequency simultaneously. An algorithm changes the SFN grouping from timeslot to timeslot, and schedules the packets. DSFN is a way of introducing timeslots and Dynamic Channel Allocation into DVB-T, without keying of the transmitter power. Thus, receiver and transmitter circuits existing on the market today can be used, and only software modifications are required. A spectrum efficiency of 0.45 bit/s/Hz/site is achieved with omni-directional antennas under certain conditions. This is a capacity improvement of 170% in comparison to a Fixed Channel Allocation solution with static handover.

Place, publisher, year, edition, pages
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Computer and Information Science
Research subject
URN: urn:nbn:se:kth:diva-28043OAI: diva2:383835
International Conference on Broadband Wireless Access Systems
QC 20110113Available from: 2011-01-06 Created: 2011-01-06 Last updated: 2011-01-13Bibliographically approved

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ReferencesLink to record
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