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Title:
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Half-Duplex Estimate-and-Forward Relaying:Bounds and Code Design |
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Author:
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Chakrabarti, Arnab; de Baynast, Alexandre; Sabharwal, Ashutosh; Aazhang, Behnaam
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Type:
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Conference Paper |
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Keywords:
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Relay; LDPC; coding; estimate-and-forward; information theory |
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Citation:
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A. Chakrabarti, A. de Baynast, A. Sabharwal and B. Aazhang,"Half-Duplex Estimate-and-Forward Relaying:Bounds and Code Design," in IEEE International Symposium on Informatin Theory (ISIT), |
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Abstract:
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We propose a coding scheme for half-duplex
estimate-and-forward relaying. Our first contribution is to
present an achievable rate for the estimate-and-forward protocol.
We also derive the achievable rate for the special case of a
Gaussian half-duplex relay channel. Guided by the information
theoretic coding scheme for the aforementioned achievable rate,
we propose a practical coding scheme. The proposed coding
scheme incorporates several design choices to reduce receiver
complexity without compromising performance. Binary LDPC
codes are used in the source broadcast phase. Estimation is
performed by scalar quantization of the received signal at the
relay. Finally, a procedure similar to maximal ratio combining is
used to aggregate direct and relayed signals at the destination.
An important practical advantage of our scheme is that it does
not require symbol level source-relay synchronization. The codes
outperform direct and two-hop channel capacities, as well as
decode-and-forward relaying when the relay-destination link is
strong. |
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Date Published:
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2006-01-01 |
