Title page for ETD etd-12132006-142934


Type of Document Dissertation
Author Chembil Palat, Ramesh
Author's Email Address rchembil@vt.edu
URN etd-12132006-142934
Title Performance analysis of cooperative communication for wireless networks
Degree PhD
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Annamalai, Annamalai Jr. Committee Co-Chair
Reed, Jeffrey Hugh Committee Co-Chair
Ellingson, Steven W. Committee Member
Ribbens, Calvin J. Committee Member
Tranter, William H. Committee Member
Keywords
  • diversity
  • MIMO
  • wireless
  • relaying
  • time synchronization error
  • cooperative communication
Date of Defense 2006-12-08
Availability unrestricted
Abstract
The demand for access to information when and where you need has motivated the transition of wireless communications from a fixed infrastructure based cellular communications technology to a more pervasive adhoc wireless networking technology. Challenges still remain in wireless adhoc networks in terms of meeting higher capacity demands, improved reliability and longer connectivity before it becomes a viable widespread commercial technology. Present day wireless mesh networking uses node-to-node serial multi-hop communication to convey information from source to destination in the network. The performance of such a network depends on finding the best possible route between the source and destination nodes. However the end-to-end performance can only be as good as the weakest link within a chosen route. Unlike wired networks, the quality of point-to-point links in a wireless mesh network is subject to random fluctuations. This adversely affects the performance resulting in poor throughput and poor energy efficiency.

In recent years, a new paradigm for communication called cooperative communications has been proposed for which initial information theoretic studies have shown the potential for improvements in capacity over traditional multi-hop wireless networks. Cooperative communication involves exploiting the broadcast nature of the wireless medium to form virtual antenna arrays out of independent single-antenna network nodes for transmission. In this research we explore the fundamental performance limits of cooperative communication under more practical operating scenarios. Specifically we provide a framework for computing the outage and ergodic capacities of non identical distributed MIMO links, study the effect of time synchronization error on system performance, analyze the end-to-end average bit error rate (ABER) performance under imperfect relaying, and study range extension and energy efficiency offered by the system when compared to a traditional system.

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