Achievable rates for full-duplex massive MIMO systems with low-resolution ADCs/DACs under imperfect CSI environment

• Published in: EURASIP journal on wireless communications and networking 2018-09, Vol.2018 (1), p.1-12
• Main Authors: Liu, Juan, Dai, Jianxin, Wang, Jiangzhou, Yin, Xiaohui, Jiang, Zhifang, Wang, Jinyuan
• Format: Article
• Language: English
• Subjects: Achievable rates; Antennas; Communication channels; Communications Engineering; Digital to analog conversion; Digital to analog converters; Engineering; Error analysis; Full-duplex; Imperfect CSI; Information Systems Applications (incl.Internet); Interference; Low-resolution ADCs/DACs; Massive MIMO; Mean square errors; Measurement; MIMO (control systems); Networks; Noise; Scaling laws; Signal,Image and Speech Processing; State (computer science); Ultra-Reliable-and-Available Low-Latency Communications for 5G/B5G-enabled IoT
• ISSN: 1687-1472; 1687-1499
• DOI: 10.1186/s13638-018-1242-y

We investigate the uplink and downlink achievable rates of full-duplex (FD) massive multi-input multi-output (MIMO) systems with low-resolution analog-digital converters/digital-to-analog converters (ADCs/DACs), where maximum ratio combining/maximum ratio transmission (MRC/MRT) processing are adopted and imperfect channel state information (CSI) is assumed. In this paper, the quantization noise is encapsulated as an additive quantization noise model (AQNM). Then, employing the minimum mean-square error (MMSE) channel estimator, approximate expressions of the uplink and downlink achievable rates are derived, based on the analysis of the quantization error, loop interference (LI), and the inter-user interference (IUI). It is shown that the interference and noise can be eliminated by applying power scaling law properly and increasing the number of antennas. Moreover, given the number of antennas, it is found that the uplink and downlink approximate achievable rates will converge to a constant when the number of quantization bit tends to infinity. Therefore, the system performance that can be improved by increasing ADC/DAC resolution is limited, implying that it is reasonable to adopt low-resolution ADCs/DACs in FD massive MIMO systems.