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|title: ||Distributed space-time code using precoding for cellular systems|
|authors: ||Teodoro, Sara|
Gil, João M.
|keywords: ||Cooperative diversity|
Ad hoc networks
Communication channels (information theory)
|issue date: ||2010|
|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.|
|publisher version/DOI: ||http://dx.doi.org/10.1109/VETECF.2010.5594294|
|source: ||VTC 2010-Fall: IEEE 72nd Vehicular Technology Conference|
|appears in collections||DETI - Comunicações|
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