Policy-Based Radio Resource Management in Multicast OFDMA Systems

Postgraduate Thesis uoadl:1321335 599 Read counter

Unit:
Κατεύθυνση / ειδίκευση Διαχείριση Πληροφορίας και Δεδομένων (ΔΕΔ)
Library of the School of Science
Deposit date:
2013-02-01
Year:
2013
Author:
Παπουτσής Βασίλειος
Supervisors info:
Αθανασία Αλωνιστιώτη Λέκτορας
Original Title:
Policy-Based Radio Resource Management in Multicast OFDMA Systems
Languages:
English
Summary:
Wireless spectral efficiency is increasingly important due to the rapid growth
of demand for high data rate wideband wireless services. The design of a
multi-carrier system, such as an OFDMA system, enables high system capacity
suited for these wideband wireless services. This system capacity can be
further optimized with a resource allocation scheme by exploiting the
characteristics of the wireless fading channels. The fundamental idea of a
resource allocation scheme is to efficiently distribute the available wireless
resources, such as the subcarriers and transmission power, among all admitted
users in the system.
Regarding the problems of resource allocation in OFDMA-based wireless
communicationsystems, much of the research effort mainly focuses on finding
efficient power controland subcarrier assignment policies. With systems
employing multicast transmission,the available schemes in literature are not
always applicable. Moreover, the existing approachesare particularly
inaccessible in practical systems in which there are a large numberof OFDM
subcarriers being utilized, as the required computational burden is
prohibitivelyhigh.
The ultimate goal of this Thesis is therefore to propose affordable mechanisms
toflexibly and effectively share out the available resources in multicast
wireless systems deployingOFDMA technology. Specifically, according to
multicast system, it is assumed thatboth the BS and each user are equipped
witha single antenna and the allocation unit is not the subcarrier,as in
conventional OFDMA systems, but a set of contiguoussubcarriers, which is called
chunk, in order to alleviate the heavy computational burden.
An efficient algorithmis proposed whose aim is to maximize the total throughput
subject to constraints on totalavailable power,BER over a chunk, and
proportional data rates constraints among multicast groups. Simulation and
complexity analysis are provided to support thebenefits of chunk-based resource
allocation to multicast OFDMA systems with targeting proportional data rates
among multicast groups.
Keywords:
Wireless telecommunications, Multicast systems, Fairness constraints, Resource allocation, Chunk
Index:
Yes
Number of index pages:
9-13, 52-55
Contains images:
Yes
Number of references:
117
Number of pages:
62
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