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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
computer science
Opportunistic multiple access for cognitive radio networks
IEEE Journal on Selected Areas in Communications, Volume 29, No. 4, Article 5738215, Year 2011
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Description
In this paper, opportunistic multiple access to the under-utilized channel resources is investigated. Exploiting source burstiness, secondary cognitive nodes utilizes primary nodes' periods of silence to access the channel and transmit their packets. Cognitive relays could also make use of these silence periods to offer spatial diversity without incurring bandwidth efficiency losses. First, we consider the cognitive cooperation protocol and propose two different relay assignment schemes. Comparison between the proposed schemes is carried out through a maximum stable throughput analysis of the network. Then, secondary nodes access to the remaining idle channel resources is investigated. Queueing theoretical analysis and numerical results reveal that despite the fact that relays occupy part of the idle resources to provide cooperation, secondary nodes surprisingly achieve higher throughput in the presence of relays. The rationale is that relays help primary nodes empty their queues at faster rates, therefore, secondary nodes observe increased access opportunities to the channel. © 2006 IEEE.
Authors & Co-Authors
El-Sherif, Amr A.
Egypt, Alexandria
Faculty of Engineering
Sadek, Ahmed K.
United States, San Diego
Qualcomm Incorporated
Liu, K. J.Ray
United States, College Park
A. James Clark School of Engineering
Statistics
Citations: 53
Authors: 3
Affiliations: 3
Identifiers
Doi:
10.1109/JSAC.2011.110404
ISSN:
07338716
Research Areas
Health System And Policy