Partial beamforming to reduce ADC power consumption in antenna array systems

Abstract

In this paper, we consider a receiver setup with fewer analog to digital convertors (ADC's) than antennas. An analog preprocessing network (APN) is placed before the ADC's to reduce power consumption in the receiver. A set of low resolution beamformers is used to design the APN and cancel contributions of interfering users. Simulation results show that introduction of such APN design algorithms for a narrowband channel with 3 to 4 interfering users, 6 antennas and 3 ADCs results in a reduction of the total consumed receiver power by 15%.Index Terms-analog beamforming, reduced rank processing, cross-spectral projections, passive weighing structures.

Joint DL and UL Channel Estimation for Millimeter Wave MIMO Systems Using Tensor Modeling

“…However, due to the severe path loss over the mmWave frequency bands, large antenna arrays should be deployed at the base station (BS) and mobile stations (MSs) to provide su cient beamforming gain in mmWave MIMO scenarios [1]. In this context, the implementation of fully digital beamforming architectures becomes prohibitive due its expensive cost, hardware constraints, and power consumption of high-resolution analog-to-digital converters (ADC) and digital-to-analog converters (DAC) per antenna port [2,3]. To overcome these practical limitations, hybrid analog-digital beamforming (HB) architectures that split the signal processing between analog and digital domains using a reduced number of radio frequency (RF) chains (assumed to be smaller than the number of antennas) have been investigated [4,5].…”