Comparing Duplexing, Multiplexing, and Multiple Access Techniques in Ad Hoc Networks

Wireless ad-hoc networks have seen much attention in recent years, and are still a topic of much interest, especially as a result of an increasing need for ubiquitous connectivity. Ad-hoc networks have applications in tactical military systems as well as in commercial systems because of the numerous benefits they offer. There are still a number of open research questions regarding these networks, and this dissertation work addresses the question of which duplexing, multiplexing, and multiple access (D/M/MA) techniques are preferable in ad hoc networks. These techniques have substantial impact on network performance, yet surprisingly this particular topic has seen little attention. Moreover, most of the existing literature is focused on higher layers such as medium access control (MAC) and network layers, while our work concentrates on the physical (PHY) layer, which plays an important and fundamental role in network design. In this dissertation, we investigate D/M/MA techniques in ad-hoc networks and more generally, how to allocate time/frequency resources to achieve better network performance. We provide a comparison of time, frequency, and time-frequency schemes in terms of a number of features, including duty cycles, required data rate per transmission, required transmit power per link, throughput, relative range and capacity. To keep the analyses tractable, topologies we study are full mesh networks, relay networks, and several special cases of ad-hoc networks. The main results show that for a peak power constraint, in terms of data rate, range, or capacity, continuous single-carrier waveforms are superior to bursted multi-carrier waveforms, and these schemes are attained with appropriate application of “hybrid” time-frequency division. Latency and throughput simulation results are provided for mesh networks, and analytical signal-to-noise-plus-interference ratio, multi-hop gain and simulation results for relay networks are also presented, to support our theoretically-based claims and aid in the network design.

Name thesis:degree_name

Doctor of Philosophy (PhD)

Level thesis:degree_level

doctoral

Discipline thesis:degree_discipline

Electrical Engineering (Engineering and Technology)

Grantor dc:publisher

Ohio University

Year dc:date

2013

Author dc:creator

• Zhang, Qian

Contributors dc:contributor

• Dill, Jeffrey
• Matolak, David

• Electrical Engineering
• Wireless ad hoc networks
• multi-hop relay
• mesh networks
• resource allocation
• multiple access

Statement dc:rights

• unrestricted
• This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.

Language dc:language

English

Repository record dc:identifier

http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1364041898

OAI identifier oai:identifier

oai:etd.ohiolink.edu:ohiou1364041898