Multiple-User Cooperative Communications Based on Linear Network Coding
2010 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 58, no 12, 3345-3351 p.Article in journal (Refereed) Published
We propose a new scheme for cooperative wireless networking based on linear network codes. The network consists of multiple (M >= 2) users having independent information to be transmitted to a common basestation ( BS), assuming block-fading channels with independent fading for different codewords. The users collaborate in relaying messages. Because of potential transmission errors in links, resulting in erasures, the network topology is dynamic. To efficiently exploit the diversity available by cooperation and time-varying fading, we propose the use of diversity network codes (DNCs) over finite fields. These codes are designed such that the BS is able to rebuild the user information from a minimum possible set of coded blocks conveyed through the dynamic network. We show the existence of deterministic DNCs. We also show that the resulting diversity order using the proposed DNCs is 2M - 1, which is higher than schemes without network coding or with binary network coding. Numerical results from simulations also show substantial improvement by the proposed DNCs over the benchmark schemes. We also propose simplified versions of the DNCs, which have much lower design complexity and still achieve the diversity order 2M - 1.
Place, publisher, year, edition, pages
IEEE Communications Society , 2010. Vol. 58, no 12, 3345-3351 p.
Linear network coding, cooperative communications, source-coding, outage probability, code construction, dynamic topology, field size
IdentifiersURN: urn:nbn:se:kth:diva-39366DOI: 10.1109/TCOMM.2010.092810.100045ISI: 000285357200001ScopusID: 2-s2.0-78650418369OAI: oai:DiVA.org:kth-39366DiVA: diva2:439801
FunderSwedish Research Council
QC 201109092011-09-092011-09-092011-12-28Bibliographically approved