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http://hdl.handle.net/10773/5361
Title: | Distributed space-time code using precoding for cellular systems |
Author: | Teodoro, Sara Silva, Adão Gil, João M. Gameiro, Atílio |
Keywords: | Cooperative diversity Decision feedback Precoding Relay Viterbi algorithm Co-operative diversity Decision feedback Precoding Relay Viterbi Ad hoc networks Communication channels (information theory) Viterbi algorithm |
Issue Date: | 2010 |
Publisher: | IEEE |
Abstract: | We propose a data precoded relay-assisted scheme, for a system cooperating with 2 relays. We assume that all the terminals are 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 equivalent to that of a modulation technique with m bits per symbol in the case a continuous link would be available from the BS to the UT requires the use of a constellation with 2m bits per symbol. This implies a penalty in power efficiency. The proposed simple precoding scheme exploits the relation between QPSK and 16-QAM, by alternately transmitting through the 2 relays, keeping the diversity of order 2. Numerical results show significant performance improvements relatively to the case of a relay-based distributed Alamouti employing 16-QAM, and a performance very close to the non-cooperative system employing 2x1 QPSK Alamouti coding with a continuous link available, when all the links have the same SNR. ©2010 IEEE. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/5361 |
DOI: | 10.1109/VETECF.2010.5594294 |
ISSN: | 1090-3038 978-1-4244-3574-6 |
Appears in Collections: | DETI - Comunicações |
Files in This Item:
File | Description | Size | Format | |
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Sara_vtc_fall_2010.pdf | 166.22 kB | Adobe PDF |
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