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We assume that perfect channel information is available at each MS and that this channel information is fed back to the BS using a feedback link.
Since we assumed that the destination of the multi-hop relay channel has CSI for all the channels in the receive mode, this optimization can be done at the destination, and using a feedback link, the source and each relay stage can be informed about the index of antennas to use for transmission.
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In some fading environments, there may not be a feedback link sufficiently fast to convey the full CSI to the MR. The MR may know only the channel distribution information (CDI) and may use the CDI to allocate resource.
It uses a feedback structure.
Using the CSI, the destination performs subset selection, and using a low rate feedback link feedbacks the index of the antennas to be used by the source and each relay stage.
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In order to compare DF with AF, we need to relate the number of feedback bits B per user with SNR fb and the number of channel uses in the feedback link, or equivalently β fb.
For P s, the secondary relays and the primary destination send the local CSIs to the secondary source firstly by using feedback links.
This paper presents a model-based tracking controller design for two-link manipulators using a fuzzy state-feedback gain-scheduling approach.
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