Opportunistic Scheduling, Cooperative Relaying and Multicast in Wireless Networks

abstract: This dissertation builds a clear understanding of the role of information in wireless networks, and devises adaptive strategies to optimize the overall performance. The meaning of information ranges from channel/network states to the structure of the signal itself. Under the common thread...

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Other Authors: Paataguppe Suryanarayan Bhat, Chandrashekhar Thejaswi (Author)
Format: Doctoral Thesis
Language:English
Published: 2011
Subjects:
Online Access:http://hdl.handle.net/2286/R.I.8840
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spelling ndltd-asu.edu-item-88402018-06-22T03:01:21Z Opportunistic Scheduling, Cooperative Relaying and Multicast in Wireless Networks abstract: This dissertation builds a clear understanding of the role of information in wireless networks, and devises adaptive strategies to optimize the overall performance. The meaning of information ranges from channel/network states to the structure of the signal itself. Under the common thread of characterizing the role of information, this dissertation investigates opportunistic scheduling, relaying and multicast in wireless networks. To assess the role of channel state information, the problem of opportunistic distributed opportunistic scheduling (DOS) with incomplete information is considered for ad-hoc networks in which many links contend for the same channel using random access. The objective is to maximize the system throughput. In practice, link state information is noisy, and may result in throughput degradation. Therefore, refining the state information by additional probing can improve the throughput, but at the cost of further probing. Capitalizing on optimal stopping theory, the optimal scheduling policy is shown to be threshold-based and is characterized by either one or two thresholds, depending on network settings. To understand the benefits of side information in cooperative relaying scenarios, a basic model is explored for two-hop transmissions of two information flows which interfere with each other. While the first hop is a classical interference channel, the second hop can be treated as an interference channel with transmitter side information. Various cooperative relaying strategies are developed to enhance the achievable rate. In another context, a simple sensor network is considered, where a sensor node acts as a relay, and aids fusion center in detecting an event. Two relaying schemes are considered: analog relaying and digital relaying. Sufficient conditions are provided for the optimality of analog relaying over digital relaying in this network. To illustrate the role of information about the signal structure in joint source-channel coding, multicast of compressible signals over lossy channels is studied. The focus is on the network outage from the perspective of signal distortion across all receivers. Based on extreme value theory, the network outage is characterized in terms of key parameters. A new method using subblock network coding is devised, which prioritizes resource allocation based on the signal information structure. Dissertation/Thesis Paataguppe Suryanarayan Bhat, Chandrashekhar Thejaswi (Author) Zhang, Junshan (Advisor) Cochran, Douglas (Committee member) Duman, Tolga (Committee member) Hui, Yu (Committee member) Taylor, Thomas (Committee member) Arizona State University (Publisher) Electrical Engineering channel state informatoin cooperative relaying interference multicast opportunistic scheduling side information eng 140 pages Ph.D. Electrical Engineering 2011 Doctoral Dissertation http://hdl.handle.net/2286/R.I.8840 http://rightsstatements.org/vocab/InC/1.0/ All Rights Reserved 2011
collection NDLTD
language English
format Doctoral Thesis
sources NDLTD
topic Electrical Engineering
channel state informatoin
cooperative relaying
interference
multicast
opportunistic scheduling
side information
spellingShingle Electrical Engineering
channel state informatoin
cooperative relaying
interference
multicast
opportunistic scheduling
side information
Opportunistic Scheduling, Cooperative Relaying and Multicast in Wireless Networks
description abstract: This dissertation builds a clear understanding of the role of information in wireless networks, and devises adaptive strategies to optimize the overall performance. The meaning of information ranges from channel/network states to the structure of the signal itself. Under the common thread of characterizing the role of information, this dissertation investigates opportunistic scheduling, relaying and multicast in wireless networks. To assess the role of channel state information, the problem of opportunistic distributed opportunistic scheduling (DOS) with incomplete information is considered for ad-hoc networks in which many links contend for the same channel using random access. The objective is to maximize the system throughput. In practice, link state information is noisy, and may result in throughput degradation. Therefore, refining the state information by additional probing can improve the throughput, but at the cost of further probing. Capitalizing on optimal stopping theory, the optimal scheduling policy is shown to be threshold-based and is characterized by either one or two thresholds, depending on network settings. To understand the benefits of side information in cooperative relaying scenarios, a basic model is explored for two-hop transmissions of two information flows which interfere with each other. While the first hop is a classical interference channel, the second hop can be treated as an interference channel with transmitter side information. Various cooperative relaying strategies are developed to enhance the achievable rate. In another context, a simple sensor network is considered, where a sensor node acts as a relay, and aids fusion center in detecting an event. Two relaying schemes are considered: analog relaying and digital relaying. Sufficient conditions are provided for the optimality of analog relaying over digital relaying in this network. To illustrate the role of information about the signal structure in joint source-channel coding, multicast of compressible signals over lossy channels is studied. The focus is on the network outage from the perspective of signal distortion across all receivers. Based on extreme value theory, the network outage is characterized in terms of key parameters. A new method using subblock network coding is devised, which prioritizes resource allocation based on the signal information structure. === Dissertation/Thesis === Ph.D. Electrical Engineering 2011
author2 Paataguppe Suryanarayan Bhat, Chandrashekhar Thejaswi (Author)
author_facet Paataguppe Suryanarayan Bhat, Chandrashekhar Thejaswi (Author)
title Opportunistic Scheduling, Cooperative Relaying and Multicast in Wireless Networks
title_short Opportunistic Scheduling, Cooperative Relaying and Multicast in Wireless Networks
title_full Opportunistic Scheduling, Cooperative Relaying and Multicast in Wireless Networks
title_fullStr Opportunistic Scheduling, Cooperative Relaying and Multicast in Wireless Networks
title_full_unstemmed Opportunistic Scheduling, Cooperative Relaying and Multicast in Wireless Networks
title_sort opportunistic scheduling, cooperative relaying and multicast in wireless networks
publishDate 2011
url http://hdl.handle.net/2286/R.I.8840
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