Rate Analysis and ADC Bits Allocation for Cell-Free Massive MIMO Systems with Low Resolution ADCs

We study the effects of low resolution analog-to-digital converters (ADCs) on cell-free massive multiple-input multiple-output (MIMO) systems. We first derive a closed-form expression for the achievable rate, which enables efficient evaluation of the impact of key parameters on system performance. Then, we give a simple approximate closed-form expression for the individual user rate, which indicates that the ADC resolution at the user is the main constraining factor for the user rate. Furthermore, we study the allocation of ADC resolution bits among different access points (APs) with fixed total resolution bits. It has been shown that our proposed ADC resolution bits allocation scheme is substantially superior to the equal ADC resolution bits allocation scheme. Finally, we provide simulation results to verify our analytical results.

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