In this letter, we introduce five different strategies of linear transmit signal processing for multi-user MIMO systems and provide performance comparisons in terms of maximum throughput in both uncorrelated and correlated channels when the number of transmit antennas is much larger than the number of receive antennas. It is shown that the multi-user MIMO schemes are preferable to TDMA based MIMO schemes, hence demonstrating the power of multi-user MIMO signal processing. Our work also indicates possibilities for future research in finding efficient sub-optimal algorithms. As an example, we show that our Multi-user MIMO Decomposition scheme can improve the maximum throughput compared to TDMA based MIMO schemes for large number of transmit antennas or high transmit power.
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