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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
Viterbi algorithm
Co-operative diversity
Decision feedback
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
DOI: 10.1109/VETECF.2010.5594294
ISSN: 1090-3038
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