Achievable Rates of Hybrid Architectures with Few-Bit ADC Receivers
Jianhua Mo, Ahmed Alkhateeb, Shadi Abu-Surra Robert W. Heath, Jr.
The 20th International ITG Workshop on Smart Antennas (WSA), Munich, March 2016.
Hybrid analog/digital precoding and combining with low-resolution analog-to-digital converters (ADCs) are two promising solutions that were proposed to reduce the cost and power consumption in millimeter wave (mmWave) systems. In this paper, we consider a new transceiver architecture that combines some elements of hybrid precoding and low-resolution ADCs. For this architecture, we derive lower and upper bounds on the achievable rates. Further, we investigate the interplay between numbers of RF chains and ADC quantization bits, which provide some insights into the energy-rate trade-offs for the adopted architecture. Results illustrate that hybrid architectures can achieve comparable rates to the fully-digital solutions in the low-to-medium SNR ranges, even with few-bit ADC receivers.