Stable Throughput in a Cognitive Wireless Network
Anthony Fanous, Anthony Ephremides

TL;DR
This paper analyzes how secondary cognitive wireless networks can coexist with primary users, focusing on stable throughput, the impact of sensing errors, and relaying protocols to enhance primary stability and secondary access.
Contribution
It introduces a relaying protocol using distributed space-time coding and characterizes conditions for stable throughput in imperfect sensing scenarios.
Findings
Secondary nodes can increase throughput with more sensing errors due to more opportunities.
Relaying improves primary stability when secondary nodes assist in traffic forwarding.
Perfect sensing allows secondary nodes to operate without affecting primary throughput.
Abstract
We study, from a network layer perspective, the effect of an Ad-Hoc secondary network with N nodes randomly accessing the spectrum licensed to a primary node during the idle slots of the primary user. If the sensing is perfect, then the secondary nodes do not interfere with the primary node and hence do not affect its stable throughput. In case of imperfect sensing, it is shown that if the primary user's arrival rate is less than some calculated finite value, cognitive nodes can employ any transmission power or probabilities without affecting the primary user's stability; otherwise, the secondary nodes should control their transmission parameters to reduce the interference on the primary. It is also shown that in contrast with the primary's maximum stable throughput which strictly decreases with increased sensing errors, the throughput of the secondary nodes might increase with sensing…
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Taxonomy
TopicsCognitive Radio Networks and Spectrum Sensing · Cooperative Communication and Network Coding · Advanced MIMO Systems Optimization
