Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/6053
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Teodoro, Sara | pt |
dc.contributor.author | Silva, Adão | pt |
dc.contributor.author | Gil, João M. | pt |
dc.contributor.author | Gameiro, Atílio | pt |
dc.date.accessioned | 2012-02-08T17:21:34Z | - |
dc.date.issued | 2010 | - |
dc.identifier.uri | http://hdl.handle.net/10773/6053 | - |
dc.description.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. | pt |
dc.language.iso | eng | pt |
dc.rights | restrictedAccess | por |
dc.subject | Cooperative diversity | pt |
dc.subject | Relay | pt |
dc.subject | Space-Frequency Block Code | pt |
dc.subject | Viterbi algorithm | pt |
dc.title | Precoded multiple relay-assisted scheme for cellular systems | pt |
dc.type | conferenceObject | pt |
dc.peerreviewed | yes | pt |
ua.publicationstatus | published | pt |
ua.event.date | 3-7 Outubro, 2011 | pt |
ua.event.type | other | pt |
degois.publication.title | WPMC'11: Wireless Personal Multimedia Communications Symposium | - |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | http://www.wpmc2011.org/ | * |
Appears in Collections: | DETI - Comunicações |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
WPMC_2010.pdf | 252.01 kB | Adobe PDF |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.