Abstract
The uplink of multi-user massive multi-input-multi-output systems, in which the base station is equipped with a low-resolution analog-to-digital converter architecture, is considered in this letter. All the channels are assumed to undergo independent and nonidentically distributed Nakagami- $m$ fading. By means of moment matching, the signal-to-interference-plus-quantization-noise ratio at the output of maximum ratio combiner is approximated by a gamma random variable. Using this approximate probability density function, tight approximations for metrics, such as outage probability and rate, are derived. The gap between the simulation and the approximate result is negligible. In addition, for a large number of antennas, a decrease in the number of antennas should be accompanied by a proportionate decrease in the threshold to maintain the same outage probability.
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