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Coordinated beamforming in multipoint MIMO networks has been introduced to increase the overall capacity of wireless networks. In coordinated beamforming, the channel state information between the different MIMO access points/base stations in one hand, and the mobile stations on the other hand, needs to be shared among the MIMO nodes. A "Backhaul" between different MIMO access points is used to transfer the channel state information. The channel state information of different links is quantized with different quantization steps according to a specific optimization criteria. This information is then shared through the backhaul.
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