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By adopting a particular controller design methodology, it was found that only the process delay and the time-constant of the feedback transmitter affect closed-loop perfonnances.
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The performance of typical AMLs is comparable in noise and distortion to links constructed using directly modulated distributed feedback laser transmitters, but it suffers from occasional outages due to atmospheric conditions.
Furthermore, if the channel varies rapidly, it is not reasonable to acquire the instantaneous feedback at the transmitter, because the optimal transmitter designed on the basis of previously acquired information becomes outdated quickly (see [18] and the references therein).
It follows that the capacity between transmitters is given as Fig. 1 Virtual-MIMO feedback scheme with transmitter cooperation.
The second new design eliminates completely the feedback to the transmitter.
LTE radio resource management is based on time frequency scheduling, fast feedback between the transmitter and receiver, and nearly optimal adaptation of transport formats.
(2) The estimated invariant parameters of the channel are quantized and feedback to the transmitter side.
Now we assume that the C S I is outdated, because of a delay in the feedback to the transmitter.
By setting the phase of one of the N t wireless links as a reference, denoted as ϕref, the receiver needs to feedback to the transmitter N t - 1 phase differences.
In practical scenario, due to the limited capacity of feedback links, the transmitter can only obtain the quantized values of the channel states, i.e., the imperfect channel state information.
While the Section 3 focused on the optimality of bandwidth between data link and feedback link between transmitter and the receivers, we studied further effects on the local data exchange for constructing V-MIMO transmitters and the analysis on the optimal node clustering to maximize the spectral efficiency throughout this section.
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