Channel estimation errors impact on the sum rate maximisation in a JP-CoMP transmission systems

Cooperation between multicell base stations BSs is a promising technique that has the potential to mitigate inter-cell interference ICI and increase data rates without sacrificing additional frequency spectrum. Classical beamforming techniques have been used to eliminate the existing ICI and improve the sum rate of downlink cooperative multiple input multiple output transmission systems. However, a perfect knowledge of the channel state information at the transmitter is needed to perform adequate beamforming such as block diagonalisation or zero-forcing preprocessing. In practice, this is not the case due to the presence of channel estimation errors.

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