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In this paper, the authors present first real-time outdoor multi-user multi-antenna measurements based on system parameters close to 3GPP-Long Term Evolution. They demonstrate switching between various transmission modes in the downlink steered by a quantized feedback channel. Real time results show that an OFDMA proportional fair scheduler based on the quantized feedback achieves significant performance gains over a fixed OFDM-TDMA system. However, the proportional fair scheduler results in user starvation periods in the event of correlated feedbacks. To this end, they formulate a downlink scheduling problem with zero-starvation as a short term fairness objective. This is an Integer Programming (IP) problem.
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