Low Power and Reduced Hardware UWB Beamformers for Future 5G Communications

John L. VOLAKIS  Rimon HOKAYEM  Satheesh Bojja VENKATAKRISHNAN  Elias A. ALWAN  

Publication
IEICE TRANSACTIONS on Communications   Vol.E102-B   No.2   pp.166-173
Publication Date: 2019/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018ISI0003
Type of Manuscript: INVITED PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2017)
Category: Antennas
Keyword: 
ultra-wideband,  5G,  beamformer,  arrays,  frequency independent,  self-mixing,  

Full Text: FreePDF


Summary: 
We present a novel hybrid beamforming architecture for high speed 5G technologies. The architecture combines several new concepts to achieve significant hardware and cost reduction for large antenna arrays. Specifically, we employ an on-site code division multiplexing scheme to group several antenna elements into a single analog-to-digital converter (ADC). This approach significantly reduces analog hardware and power requirements by a factor of 8 to 32. Additionally, we employ a novel analog frequency independent beamforming scheme to eliminate phase shifters altogether and allow for coherent combining at the analog front-end. This approach avoids traditional phase-shifter-based approaches typically associated with bulky and inefficient components. Preliminary analysis shows that for an array of 800 elements, as much as 97% reduction in cost and power is achieved using the hybrid beamformer as compared to conventional beamformer systems.