Dynamic resource allocation in OFDMA systems
Authors: Einhaus, Michael
Chair of Communication Networks (ComNets), Faculty 6, RWTH Aachen University
Contact: publications@comnets.rwth-aachen.de
Ph. D. Dissertation Wissenschaftsverlag Mainz, ABMT 61, p. 219, ISBN:3-86130-941-3, 2009.
Publication Date: , 2009
On page(s):219
ISBN: 3-86130-941-3
Abstract Orthogonal Frequency Division Multiple Access (OFDMA) refers to a radio transmission technique based on dividing the frequency channel into narrowband subchannels. Compared to single carrier systems with multiple access in the time domain, OFDMA systems are less prone to inter-symbol interference (ISI), can exploit frequency diversity, and provide fine granularity for the dynamic resource allocation. Due to these advantages, OFDMA has been chosen to be the basis for the standards IEEE 802.16e (MobileWimax) and 3GPP Long Term Evolution (LTE), and it remains a strong candidate for future standards addressing challenging quality of service (QoS) demands in multi-service environments. This thesis addresses the dynamic resource allocation in the medium access control (MAC) layer. This is one of the challenges in OFDMA based system design, since efficiently exploited physical layer (PHY) capabilities significantly increase the overall system performance in terms of providing QoS under various traffic characteristics; the keyword in this context is cross-layer optimization. A comprehensive performance evaluation of the dynamic resource allocation in broadband OFDMA systems with focus on the MAC layer is presented in this work. Different OFDMA subchannel structures in combination with various scheduling strategies are compared in terms of throughput, delay and fairness. Realistic scenarios are evaluated under consideration of uncertainty in resource quality estimation. The performance evaluations are done by means of both analytical models and stochastic event-driven simulation. The presented results provide design guidelines for the development of future broadband OFDMA systems.
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@PHDTHESIS{DISS_Einhaus_2009,
AUTHOR = {Einhaus, M.},
TITLE = {Dynamic resource allocation in OFDMA systems},
YEAR = {2009},
VOLUME = {61},
PAGES = {219},
ADDRESS = {Lehrstuhl für Kommunikationsnetze},
SCHOOL = {Wissenschaftsverlag Mainz},
SERIES = {ABMT},
AFFILIATION = {Chair of Communication Networks (ComNets), Faculty 6, RWTH Aachen University},
ISBN = {3-86130-941-3},
URL = {https://www.comnets.rwth-aachen.de}
}
Signature in CN-Library = {Qa 061}