wiki:MurphyPhDThesis

Design, Implementation and Characterization of a Cooperative Communications System

Patrick Murphy
PhD Thesis
Rice University Department of Electrical and Computer Engineering
Defended & Submitted December 2010

Abstract

Cooperative communications is a class of techniques which seek to improve reliability and throughput in wireless systems by pooling the resources of distributed nodes. While cooperation can occur at different network layers and time scales, physical layer cooperation at symbol time scales offers the largest benefit. However, symbol level cooperation poses significant implementation challenges, especially in the context of a network of distributed nodes.

We first present the design and implementation of a complete cooperative physical layer transceiver, built from scratch on the Wireless Open-Access Research Platform (WARP). In our implementation fully distributed nodes employ physical layer cooperation at symbol time scales without requiring a central synchronization source. Our design supports per-packet selection of non-cooperative or cooperative communication, with cooperative links utilizing either amplify-and-forward or decode-and-forward relaying. A single design implements transmission, reception and relaying, allowing each node to assume the role of source, destination or relay per packet.

We also present experimental methodologies for evaluating our design and extensive experimental results of our transceiver's performance under a variety of topologies and propagation conditions. Our methods are designed to test both overall performance and to isolate and understand the underlying causes of performance limitations. Our results clearly demonstrate significant performance gains (more than 40x improvement in PER in some topologies) provided by physical layer cooperation even when subject to the constraints of a real-time implementation.

As with all our work on WARP, our transceiver design and experimental framework are available via the open-source WARP repository for use by other wireless researchers.

Thesis

Design, Implementation and Characterization of a Cooperative Communications System (4MB PDF)

Defense Slides

PhD Defense Slides (5MB PDF)

Citation

@phdthesis{murphyPhD,
  Author = {Patrick Murphy},
  School = {Rice University},
  Title = {Design, Implementation and Characterization of a Cooperative Communications System},
  Year = {2010},
  URL = {http://warp.rice.edu/w/MurphyPhDThesis}}

Contact

Patrick is now with Mango Communications (patrick [at] mangocomm.com).

Last modified 14 months ago Last modified on Jun 22, 2013 10:11:28 PM