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 Precoded multiple relay-assisted scheme for cellular systems
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/6053

title: Precoded multiple relay-assisted scheme for cellular systems
authors: Teodoro, Sara
Silva, Adão
Gil, João M.
Gameiro, Atílio
keywords: Cooperative diversity
Relay
Space-Frequency Block Code
Viterbi algorithm
issue date: 2010
abstract: We propose a precoded relay-assisted scheme, for a system cooperating with several relays, all the terminals equipped with a single antenna. The use of relays is of significant interest to allow radio access in situations where a direct path is not available. However because of the half duplex constraint at the relays, transmission of a data rate that would be possible using a modulation technique with m bits per symbol in the case a continuous link was available from the base station to the user terminal, requires the use of a constellation with 2m bits per symbol. This implies a penalty in the power efficiency. In this communication we propose a simple precoding scheme that exploits the relation between QPSK and M-QAM, by alternately transmitting through the various relays, keeping the diversity of order L where L is the number of relays. Numerical results with L=3 show significant performance improvements relatively to the case of a relay based scheme with distributed QO-SFBC employing 16-QAM and a performance very close to the non-cooperative system employing 3x1 QPSK QO-SFBC coding with a continuous link available.
URI: http://hdl.handle.net/10773/6053
publisher version/DOI: http://www.wpmc2011.org/
source: WPMC'11: Wireless Personal Multimedia Communications Symposium
appears in collectionsDETI - Comunicações

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