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In this paper, the authors compare different pre-coding techniques and their performance in a cellular MIMO OFDM downlink. The first target is to determine the achievable additional beamforming gain by using a near-optimum pre-coder instead of DFT-based pre-coding. In the second step, they include multi-user selection diversity, which turned out to be advantageous especially for downlink cooperation. An extended score-based scheduler, which is known to asymptotically reach proportional fairness, is used for the user grouping and resource allocation in the cellular downlink. Further, they use minimum mean square error equalization at the terminal side to combat residual co-channel interference.
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