Adaptive Protocols for Frequency-Hop Packet Radio Networks
Russell, Harlan Blair
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https://hdl.handle.net/2142/72023
Description
Title
Adaptive Protocols for Frequency-Hop Packet Radio Networks
Author(s)
Russell, Harlan Blair
Issue Date
1993
Doctoral Committee Chair(s)
Pursley, Michael B.
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Abstract
Reliable data distribution within spread-spectrum packet radio networks requires good performance from the network protocols. This thesis describes research in transmission, forwarding, and routing protocols that are adaptive and decentralized. The protocols are designed specifically for frequency-hop (FH) packet radio networks in which some of the radios are subjected to excessive interference. Forwarding protocols are developed that can react to local sources of interference, and improvements in the network performance are made when information about the interference environment and acknowledgments is incorporated into the protocols. Least-resistance routing (LRR) is improved through the use of new metrics that give a quantitative assessment of the interference environment experienced by the receiver in a FH radio, and the key information needed for these metrics is extracted from the decoder. The metrics that are introduced permit LRR to react to interference in the network, especially mobile partial-band interference. Additional contributions are made by modifying the LRR metrics to include other network parameters that measure certain conditions that impede a packet's progress to its destination. These parameters are incorporated into the metrics through the use of the conditional probability that a radio can receive and forward a packet given the state of the radio. Two new transmission protocols are developed that allow multiple packets per transmission, and they provide large improvements in the network throughput. The transmission protocols exploit the capture property of FH signaling and reduce the overhead due to acknowledgments and acquisitions.
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