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Also, the problem of developing an additional outer bound that considers a noiseless relay destination link remains open for the channel studied here.
Click the "Add Destination" link below the "B" field to create the "C" field.
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where and are the instantaneous of source-to-destination link and relay-to-destination link, respectively.
The relay then can determine the CSI of the relay-destination link assuming that the relay-destination link is symmetric.
However, if the channel quality of the source-to-destination link is less than the relay-to-destination link, the Pr will be less than one.
The corresponding bound with a noiseless relay-destination link remains unknown.
Each source-relay-destination link can thus be seen as a two-hop relay channel.
First, we derive equalization weights for the first stage corresponding to the source-destination link.
In a low SNR regime, the power allocation results in two cases: (A) small channel variance in the source-to-destination link compared with the relay-to-destination link, where variance (0.1, 1, 1) and (B) high channel variance in the source-to-destination link compared with the relay-to-destination link, where variance (1, 1, 0.1).
In the system which has the same channel quality between the source-to-destination link and the relay-to-destination link, the transmission power P1 will be equal to P2, i.e., Pr = 1.
This is because the SNR in the source-to-destination link in (23) and (24) contains a factor of (1 + w) which is higher than factor (w) in the relay-to-destination link.
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