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Generalized Analysis on Diversity-Multiplexing Trade-off of Relay Protocols |
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PP: 511-517 |
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Author(s) |
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Yafeng Wang,
Lin Qin,
Wei Xiang,
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Abstract |
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| Under the more practical assumption that transmitters have no knowledge of the channel state information (CSI) but the
channel distribution information (CDI), this paper examines the diversity-multiplexing trade-off (DMT) of two classes of cooperative
protocols, namely, the amplify-and-forward (AF) and decode-and-forward (DF) protocols, with a three-node half-duplex relay network
under slow fading. First, analyzing these protocols reveals that each one has its own optimal DMT with a specific time slot ratio,
i.e., the ratio between the durations of the slots assigned to base station transmission and that assigned to relay transmission. We then
demonstrate that under ideal coding, the incremental decode-and-forward protocol approaches the DMT upper bound when the two
slots are of equal length, which outperforms all the other protocols. Furthermore, it is proved that the selective decode-and-forward
protocol achieves its optimal performance with a slot assignment ratio of (
p
5+1)=2. In addition, we also find AF, selective AF and
incremental AF have no difference from the perspective of DMT. |
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