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PHYSICAL LAYER MULTICASTING WITH
OPPORTUNISTIC MULTICAST SCHEDULING
by
Tze-Ping Low
A Dissertation Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Ful llment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(ELECTRICAL ENGINEERING)
August 2011
Copyright 2011 Tze-Ping Low
Object Description
| Title | Physical layer multicasting with opportunistic multicast scheduling |
| Author | Low, Tze-Ping |
| Author email | tlow@usc.edu;tzeping.low@gmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2011-05-10 |
| Date submitted | 2011-07-07 |
| Date approved | 2011-07-08 |
| Restricted until | 2011-07-08 |
| Date published | 2011-07-08 |
| Advisor (committee chair) | Kuo, C.-C. Jay |
| Advisor (committee member) |
Mendel, Jerry M. Molisch, Andreas F. Dimakis, Alexandros G. Proskurowski, Wlodek |
| Abstract | Physical layer multicasting with optimized opportunistic scheduling is studied for cellular networks, where the problem of efficiently transmitting a common set of fountain-encoded data from a single base station to multiple users over quasi-static fading channels is examined. The proposed opportunistic multicast scheduling (OMS) scheme attempts to achieve a better tradeoff between multiuser diversity and multicast gain by transmitting to a subset of users in each time slot using the maximal data rate that ensures successful decoding by these users. The research work consists of three major parts. ❧ In the first part, we consider OMS in the single-antenna downlink scenario. We analyze the system delay in homogeneous networks by capitalizing on extreme value theory and derive the optimal selection ratio ({\em i.e.,} the portion of users selected in each time slot) that minimizes the delay. Then, we extend results to heterogeneous networks where users are subject to different channel statistics. By partitioning users into multiple approximately homogeneous rings, we turn a heterogeneous network into a composite of smaller homogeneous networks and derive the optimal selection ratio for heterogeneous networks. Computer simulations confirm theoretical results and illustrate that the proposed OMS can achieve significant performance gains in both homogeneous and heterogeneous networks as compared with the conventional unicast and broadcast scheduling. ❧ In the second part, we extend the results to the multi-antenna downlink scenario where a multi-antenna base-station transmits a common message to a set of users, each with a single receive antenna. First, we propose the use of OMS for two of the most popular conventional multi-antenna multicast solutions - the spatial multiplexing and the transmit beamforming schemes. Capitalizing on extreme value theory, we derive analytical expressions for the average system throughput and utilize this result to compute the optimal user selection ratio for both spatial multiplexing and transmit beamforming scenarios. To improve upon these conventional schemes furthermore, we propose an optimized space-time transmission (OST) scheme, where an arbitrary number of signal dimensions can be used and the statistics of the space-time codeword can be chosen to maximize the rate of the worst user in the selected group. An iterative user selection (IUS) algorithm is also proposed to improve the multicast group selection in each time slot. The proposed OST with IUS is a generalization of transmit beamforming and spatial multiplexing and, thus, outperforms both conventional schemes. ❧ In the third part, we investigate the use of OMS for systems with multiple multicast groups. Here, we consider a general downlink scenario where a single base-station transmits independent data streams to multiple groups of users. Within each group, the common information is transmitted, yet the source information is independent between groups. To achieve this goal, the use of OMS is extended to systems with multiple multicast groups and the so-called multicast throughput region is defined to characterize the performance of the multigroup OMS scheme. The analytical results based on extreme value theory are utilized to accurately predict the optimal multicast group-sizes and the optimal power allocation policy when maximizing the weighted sum throughput. By choosing the weights appropriately, the method can be further utilized to ensure proportional fairness among the multiple multicast groups. The efficacy of the proposed OMS schemes is shown through numerical simulations. |
| Keyword | wireless multicast; opportunistic scheduling; physical layer multicasting; order statistics; extreme value theory |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m |
| Rights | Low, Tze-Ping |
| Access conditions | The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given. |
| Repository name | University of Southern California Digital Library |
| Repository address | USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA |
| Repository email | cisadmin@usc.edu |
| Archival file | uscthesesreloadpub_Volume71/etd-LowTzePing-63.pdf |
Description
| Title | Page 1 |
| Full text | PHYSICAL LAYER MULTICASTING WITH OPPORTUNISTIC MULTICAST SCHEDULING by Tze-Ping Low A Dissertation Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Ful llment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (ELECTRICAL ENGINEERING) August 2011 Copyright 2011 Tze-Ping Low |
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