Article (Scientific journals)
Efficient Algorithms for Constant-Modulus Analog Beamforming
Arora, Aakash; Tsinos, Christos; Mysore Rama Rao, Bhavani Shankar et al.
2021In IEEE Transactions on Signal Processing
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Keywords :
Analog beamforming; Majorization- Minimization; MM; Alternating MM; AMM; Cyclic Coordinate Descent; CCD; Large-Scale Antenna Arrays; Unit-Modulus Constraints; Nonconvex Optimization; Block Cyclic Coordinate Descent; BCCD
Abstract :
[en] The use of a large-scale antenna array (LSAA) has become an important characteristic of multi-antenna communication systems to achieve beamforming gains. For example, in millimeter wave (mmWave) systems, an LSAA is employed at the transmitter/receiver end to combat severe propagation losses. In such applications, each antenna element has to be driven by a radio frequency (RF) chain for the implementation of fully-digital beamformers. This strict requirement significantly increases the hardware cost, complexity, and power consumption. Therefore, constant-modulus analog beamforming (CMAB) becomes a viable solution. In this paper, we consider the scaled analog beamforming (SAB) or CMAB architecture and design the system parameters by solving the beampattern matching problem. We consider two beampattern matching problems. In the first case, both the magnitude and phase of the beampattern are matched to the given desired beampattern whereas in the second case, only the magnitude of the beampattern is matched. Both the beampattern matching problems are cast as a variant of the constant-modulus least-squares problem. We provide efficient algorithms based on the alternating majorization-minimization (AMM) framework that combines the alternating minimization and the MM frameworks and the conventional-cyclic coordinate descent (C-CCD) framework to solve the problem in each case. We also propose algorithms based on a new modified-CCD (M-CCD) based approach. For all the developed algorithms we prove convergence to a Karush-Kuhn-Tucker (KKT) point (or a stationary point). Numerical results demonstrate that the proposed algorithms converge faster than state-of-the-art solutions. Among all the algorithms, the M-CCD-based algorithms have faster convergence when evaluated in terms of the number of iterations and the AMM-based algorithms offer lower complexity.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Arora, Aakash ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Tsinos, Christos
Mysore Rama Rao, Bhavani Shankar  ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Chatzinotas, Symeon  ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Ottersten, Björn ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT)
External co-authors :
no
Language :
English
Title :
Efficient Algorithms for Constant-Modulus Analog Beamforming
Publication date :
2021
Journal title :
IEEE Transactions on Signal Processing
ISSN :
1053-587X
Publisher :
Institute of Electrical and Electronics Engineers, Luxembourg
Peer reviewed :
Peer Reviewed verified by ORBi
FnR Project :
FNR11607283 - Power Efficient Sparse Signal Processing For Digital Wideband On-board Techniques, 2017 (01/07/2017-30/06/2021) - Aakash Arora
Available on ORBilu :
since 30 August 2021

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