TY - JOUR
T1 - Spacetime Frequency-Multiplexed Digital-RF Array Receivers with Reduced ADC Count
AU - Akram, Najath
AU - Ariyarathna, Viduneth
AU - Mandal, Soumyajit
AU - Belostotski, Leonid
AU - Rappaport, Theodore S.
AU - Madanayake, Arjuna
N1 - Funding Information:
Manuscript received March 15, 2021; accepted April 7, 2021. Date of publication April 14, 2021; date of current version July 30, 2021. This work was supported in part by the U.S. National Science Foundation (NSF) under Grant 800010635. This brief was recommended by Associate Editor J. Goes. (Corresponding author: Najath Akram.) Najath Akram and Arjuna Madanayake are with the Department of Electrical and Computer Engineering, Florida International University, Miami, FL 33172 USA (e-mail: akram.m.n@ieee.org; amadanay@fiu.edu). Viduneth Ariyarathna is with the Department of Electrical and Computer Engineering, Northeastern University, Boston, MA 02115 USA. Soumyajit Mandal is with the Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32511 USA. Leonid Belostotski is with the Department of Electrical and Computer Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada. Theodore S. Rappaport is with NYU Wireless, New York University, Brooklyn, NY 11201 USA. Color versions of one or more figures in this article are available at https://doi.org/10.1109/TCSII.2021.3073059. Digital Object Identifier 10.1109/TCSII.2021.3073059
Publisher Copyright:
© 2004-2012 IEEE.
PY - 2021/8
Y1 - 2021/8
N2 - Wireless systems operating at mm-wave frequencies require dense antenna arrays to achieve directional gain for overcoming high path loss. Digital mm-wave arrays retain spatial degrees of freedom, but require a dedicated analog to data converter (ADC) per spatial channel, leading to undesirably high receiver complexity, large ADC count, and power consumption. This brief exploits directional sparsity to reduce the number of receivers and ADCs with minimal loss in performance. A multidimensional (MD) linear transformation using transmission lines and a K~:~1 combiner is used to reduce the number of ADCs by a factor K. Simulations verify that the proposed method can lead to better than 50% ADC complexity reductions (for K\ge 2) for linear arrays and more than 75% ADC complexity reduction (for K\ge 4) for rectangular arrays when sparsity conditions are met. Unlike in analog-digital hybrid beamforming, where a phased-array combines K channels to a single ADC, the proposed method does not lead to loss of spatial degrees of freedom.
AB - Wireless systems operating at mm-wave frequencies require dense antenna arrays to achieve directional gain for overcoming high path loss. Digital mm-wave arrays retain spatial degrees of freedom, but require a dedicated analog to data converter (ADC) per spatial channel, leading to undesirably high receiver complexity, large ADC count, and power consumption. This brief exploits directional sparsity to reduce the number of receivers and ADCs with minimal loss in performance. A multidimensional (MD) linear transformation using transmission lines and a K~:~1 combiner is used to reduce the number of ADCs by a factor K. Simulations verify that the proposed method can lead to better than 50% ADC complexity reductions (for K\ge 2) for linear arrays and more than 75% ADC complexity reduction (for K\ge 4) for rectangular arrays when sparsity conditions are met. Unlike in analog-digital hybrid beamforming, where a phased-array combines K channels to a single ADC, the proposed method does not lead to loss of spatial degrees of freedom.
KW - Multidimensional signal processing
KW - analog-digital conversion
KW - phased arrays
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U2 - 10.1109/TCSII.2021.3073059
DO - 10.1109/TCSII.2021.3073059
M3 - Article
AN - SCOPUS:85104241859
SN - 1549-7747
VL - 68
SP - 2840
EP - 2844
JO - IEEE Transactions on Circuits and Systems II: Express Briefs
JF - IEEE Transactions on Circuits and Systems II: Express Briefs
IS - 8
M1 - 9404265
ER -