IEEE Transactions on Wireless Communications,
vol. 18, no. 4, Apr. 2019, pp. 2401-2414, DOI 10.1109/TWC.2019.2904030.
User Scheduling for Millimeter Wave Hybrid Beamforming Systems with Low-Resolution ADCs
Gilwon Lee, and
Brian L. Evans
Department of Electrical and Computer Engineering,
Wireless Networking and Communications Group,
The University of Texas at Austin,
Austin, TX 78712 USA
Paper draft on
Related conference paper:
"User Scheduling for Millimeter Wave MIMO Communications with Low-Resolution ADCs" (2018)
Multiantenna Communications Project
We investigate uplink user scheduling for millimeter wave (mmWave) hybrid
analog/digital beamforming systems with low-resolution analog-to-digital
Deriving new scheduling criteria for the mmWave systems, we show that the
channel structure in the beamspace, in addition to the channel magnitude
and orthogonality, plays a key role in maximizing the achievable rates of
scheduled users due to quantization error.
The criteria show that to maximize the achievable rate for a given channel
gain, the channels of the scheduled users need to have
Leveraging the derived criteria, we propose an efficient scheduling
algorithm for mmWave zero-forcing receivers with low-resolution ADCs.
We further propose a chordal distance-based scheduling algorithm that
exploits only the AoA knowledge and analyze the performance by deriving
ergodic rates in closed form.
Based on the derived rates, we show that the beamspace channel leakage
resulting from phase offsets between AoAs and quantized angles of
analog combiners can lead to sum rate gain by reducing quantization
error compared to the channel without leakage.
Simulation results validate the sum rate performance of the proposed
algorithms and derived ergodic rates expressions.
- as many propagation paths as possible with unique angle-of-arrivals (AoAs)
- even power distribution in the beamspace.
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