Optimal Power Allocation in Multi-Hop Cognitive Radio Networks
2011 (English)In: 2011 IEEE 22nd International Symposium On Personal Indoor And Mobile Radio Communications (PIMRC), New York: IEEE conference proceedings, 2011, 472-476 p.Conference paper (Refereed)
Optimal power allocation in a multi-hop cognitive radio network is investigated. Information transmitted from the source passes through several wireless relay nodes before reaching the destination. At each hop, the received signal is decoded, re-encoded and retransmitted to the following node. Transmissions at every hop are overheard by nearby nodes and therefore cause interference. We study optimal power allocation strategies that maximize the end-to-end throughput of the network under the constraint of strictly limited interference to external users. We show that for networks that can be modeled as a line topology the optimal solution is achieved when the capacities of every intermediate link are equal and the interference power constraint is satisfied with equality. High-and low-SNR approximations that simplify the problem of finding the optimal power allocation are presented as well. The numerical results show good performance compared to schemes with equal power allocation.
Place, publisher, year, edition, pages
New York: IEEE conference proceedings, 2011. 472-476 p.
IdentifiersURN: urn:nbn:se:kth:diva-49643DOI: 10.1109/PIMRC.2011.6140006ISI: 000300719700091ScopusID: 2-s2.0-84857566616ISBN: 978-1-4577-1348-4OAI: oai:DiVA.org:kth-49643DiVA: diva2:459929
22nd IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Location: Toronto, Canada, Date: SEP 11-14, 2011
QC 201112012011-11-282011-11-282014-06-18Bibliographically approved