Article (Scientific journals)
Subchannel Allocation and Hybrid Precoding in Millimeter-Wave OFDMA Systems
Ha, Vu Nguyen; Nguyen, Duy H. N.; Frigon, Jean-François
2018In IEEE Transactions on Wireless Communications
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Keywords :
Hybrid precoding; OFDMA; multi-user
Abstract :
[en] Constrained by the number of transmitted data streams, this paper proposes sub-carrier allocation (SA) and hybrid precoding (HP) designs for sum-rate maximization in mm-wave OFDMA systems. The optimization is first formulated as a computation sparsity-constrained HP design problem, which is non-convex and challenging to solve. Two two-stage solution approaches are proposed. In the first approach, a fully digital precoder (FDP) is optimized considering the computation sparsity constraint in the first stage. In the second approach, the sparsity constraint is only imposed in the second stage. To find the FDP, we employ the minimization of the weighted mean-squared error and the ℓ 1 -reweighted methods to tackle the non-convex objective function and sparsity constraints, respectively. In the second stage of each approach, we exploit an alternating weighted mean-squared error minimization algorithm to reconstruct HP's based on the FDP found in the first stage. Two novel analog precoding designs, namely semi-definite-relaxation-based and projected-gradient-descent-based, are then proposed to optimize the analog part of the obtained HP's. We also study the impacts of various system parameters on the system sum-rate and provide resource provisioning insights for HP systems. Numerical results show the superior performances of the proposed designs over joint SA and HP benchmark algorithms.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Ha, Vu Nguyen  ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Nguyen, Duy H. N.
Frigon, Jean-François
External co-authors :
Language :
Title :
Subchannel Allocation and Hybrid Precoding in Millimeter-Wave OFDMA Systems
Publication date :
01 September 2018
Journal title :
IEEE Transactions on Wireless Communications
Publisher :
Institute of Electrical and Electronics Engineers, New York, United States - New York
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Security, Reliability and Trust
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