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However, the benefit from removing the feedback requirement can be seen in the throughput performance.
This can greatly reduce the burden on the feedback requirement, but then a decentralized transmission method is necessary.
Therefore, we can see how the elimination of the feedback requirement can benefit the performance of the system.
Here, the goal is to develop a simple cooperation scheme for low-mobility CoMP networks which leads to minimum feedback requirement, acceptable backhauling resources, and affordable implementation complexity.
We focus on the time-domain (TD BFF due to the lower implementation complexity and lower feedback requirement from the destination.
(Although TAS can be used at the relay for the second time slot, it provides diversity gains only when despite the additional CSI feedback requirement (see Remark 1 in Section 3).
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Robust opportunistic beamforming, which only requires partial channel state information for user selection, further reduces feedback requirements.
Higher feedback requirements.
Differential feedback is a flexible approach for reducing feedback requirements and providing high resolution [37, 38].
As mentioned in Section 2.3, there is a synergy between the used subchannelization, MU-MIMO operation, and MS feedback requirements.
The proposed algorithm obtains a trade-off among complexity, reduced feedback requirements, and performance, which makes it suitable for practical implementation.
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