Downlink Performance of Massive MIMO Two-Way AF Relay Systems with low-resolution ADCs in Rician Fading Channels

Inhalt:
In this paper, we investigated a massive multiuser, multiple-input, multiple-output (MIMO) relay network, equipped with low-resolution analog-to-digital converters (ADCs). Considering a strong LOS component in most real-life communication environment, we performed analysis under the Rician fading channels with maximum ratio transmitting (MRT) precoding on the downlink. To acquire the perfect channel state information (CSI), we derived the closed-form expression of downlink for the sum rate by utilizing the additive quantization noise model (AQNM). In addition, considering the different communication scenarios, we obtained the tractable expressions of downlink for other scenarios. Simulation results indicate that with the increasing number of antennas, transmit power, quantization bits, and Ricianfactor, the available sum rates converge to fixed values under finite number of antennas. The result demonstrates that configuring a low-resolution ADC at the relay enables a fairly high performance in a cost-effective and energy-efficient manner.