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The multi-user millimeter wave (mmWave) MIMO system has aroused great interest in recent years for future fifth generation (5G) cellular networks. We investigate the problem of uplink channel estimation in mmWave systems, which is challenging due to the strong pathloss and massive antennas deployment. Taking hardware constraints into consideration, we assume that hybrid analog and digital beamforming...
In practical multi-input-multi-output (MIMO) systems, the channel matrices often have reduced rank especially for propagation environments with limited scattering. For this scenario, reliable detection of the channel rank is essential in achieving the high performance provided by the MIMO configuration. In traditional rank detection schemes, a single threshold is used and the channel rank is detected...
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