2017/11/01 by Jin-Seok Choi, Brian L. Evans, Choi, Jinseok +1
Engineering · #Millimeter-Wave Propagation and Modeling #Advanced MIMO Systems Optimization #Microwave Engineering and Waveguides
paper · pdf · doi:10.48550/arxiv.1711.00502
In millimeter wave (mmWave) systems, we investigate uplink user scheduling\nwhen a basestation employs low-resolution analog-to-digital converters (ADCs)\nwith a large number of antennas. To reduce power consumption in the receiver,\nlow-resolution ADCs can be a potential solution for mmWave systems in which\nmany antennas are likely to be deployed to compensate for the large path loss.\nDue to quantization error, we show that the channel structure in the beamspace,\nin addition to the channel magnitude and beamspace orthogonality, plays a key\nrole in maximizing the achievable rates of scheduled users. Consequently, we\nderive the optimal criteria with respect to the channel structure in the\nbeamspace that maximizes the uplink sum rate for multi-user multiple input\nmultiple output (MIMO) systems with a zero-forcing receiver. Leveraging the\nderived criteria, we propose an efficient scheduling algorithm for mmWave\nsystems with low-resolution ADCs. Numerical results validate that the proposed\nalgorithm outperforms conventional user scheduling methods in terms of the sum\nrate.\n