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Title: Distributed space-frequency block coding for a 2-antenna relay in downlink OFDM systems
Author: Teodoro, Sara
Silva, Adão
Gil, João M.
Gameiro, Atílio
Keywords: Cooperative diversity
Space-frequency code
Virtual MIMO
Antenna terminals
Co-operative diversity
Cooperative systems
Design approaches
OFDM based system
OFDM systems
Realistic scenario
Simulation result
Single antenna
Space frequency codes
Space-frequency block coding
Transmission conditions
User terminals
Virtual MIMO
Antenna arrays
Channel coding
Information technology
Mobile telecommunication systems
Orthogonal frequency division multiplexing
Ad hoc networks
Issue Date: 2009
Publisher: IEEE
Abstract: In this paper we evaluate the coded and uncoded performance of a 2-antenna terminal relaying schem, for downlink OFDM based systems, using efficient space-frequency block coding protocols. We consider that the relay and the base station are equipped with 2 antennas and the user terminal has a single antenna. Two types of relay protocols are accounted for: Equalize-and-Forward and Decode-and-Forward. Signals expressions are derived and the bit error rates obtained for a pratical and preeminent scenario, with LTE parameters and using convolutional channel coding. The performance of the proposed relay-assited scheme is evaluated under realistic scenarios, considering typical pedestrian scenarios based on LTE specifications. Results are compared to those of other relay-assisted design approaches that have been recently proposed for the case of 1-antenna relay and the non-cooperative systems. For this comparison, we implement three propagation scenarios, with different SNR transmission conditions among links. Simulation results show that the availability of a bi-antenna array at the relay significantly improves the cooperative system performance, but improvements are highly dependent on the scenarios and relay protocol as well as of the cooperative second-hop quality.
Peer review: yes
ISBN: 9781424445219
Appears in Collections:DETI - Comunicações

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