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 Novel precoded relay-assisted algorithm for cellular systems
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/5343

title: Novel precoded relay-assisted algorithm for cellular systems
authors: Teodoro, Sara
Silva, Adão
Gil, João M.
Gameiro, Atílio
keywords: Cellular system
Cellular wireless systems
Channel quality
Cooperative schemes
Direct paths
Full diversity
Half-duplex
Higher order
Numerical results
Pair-wise error probability
Performance improvements
Power efficiency
Precoding scheme
Radio access
Reducing power
Single antenna
System fairness
Antenna arrays
Probability
Algorithms
issue date: 2010
publisher: SpringerOpen
abstract: Cooperative schemes are promising solutions for cellular wireless systems to improve system fairness, extend coverage and increase capacity. The use of relays is of significant interest to allow radio access in situations where a direct path is not available or has poor quality. A data precoded relay-assisted scheme is proposed for a system cooperating with 2 relays, each equipped with either a single antenna or 2-antenna array. However, because of the half-duplex constraint at the relays, relaying-assisted transmission would require the use of a higher order constellation than in the case when a continuous link is available from the BS to the UT. This would imply a penalty in the power efficiency. The simple precoding scheme proposed exploits the relation between QPSK and 16-QAM, by alternately transmitting through the 2 relays, achieving full diversity, while significantly reducing power penalty. Analysis of the pairwise error probability of the proposed algorithm with a single antenna in each relay is derived and confirmed with numerical results. We show the performance improvements of the precoded scheme, relatively to equivalent distributed SFBC scheme employing 16-QAM, for several channel quality scenarios. Copyright © 2010 Sara Teodoro, et al.
URI: http://hdl.handle.net/10773/5343
ISSN: 1687-1499
publisher version/DOI: http://dx.doi.org/10.1155/2010/414657
source: EURASIP Journal on Wireless Communications and Networking
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