TY - JOUR
T1 - 1-bit Phase Shifters for Large-Antenna Full-Duplex mmWave Communications
AU - Da Silva, Jose Mairton Barros
AU - Sabharwal, Ashutosh
AU - Fodor, Gabor
AU - Fischione, Carlo
N1 - Funding Information:
Manuscript received March 25, 2019; revised October 2, 2019, March 11, 2020, and June 24, 2020; accepted June 25, 2020. Date of publication July 13, 2020; date of current version October 9, 2020. The work of José Mairton Barros da Silva, Jr. was supported in part by the Brazilian National Council for Scientific and Technological Development (CNPq), in part by the Engblom Foundation, and in part by the Lars Hierta Memorial Foundation. The work of Ashutosh Sabharwal was supported in part by NSF under Grant NSF-1518916 and Grant CNS-1827940. This journal version extends the theoretical analysis, including detailed information about the blocks being optimized, complexity analysis, and convergence proofs. The numerical results section also has three new investigations beyond [1]. The simulations were performed on resources provided by the Swedish National Infrastructure for Computing (SNIC) at PDC Centre for High Performance Computing (PDC-HPC). The work of Carlo Fischione was supported by the Ericsson sponsored project SPECS II. An earlier version of this article was presented at the IEEE ICC’19 [1]. The associate editor coordinating the review of this article and approving it for publication was D. Guo. (Corresponding author: José Mairton Barros Da Silva, Jr.) José Mairton Barros da Silva, Jr., and Carlo Fischione are with the KTH Royal Institute of Technology, 10044 Stockholm, Sweden (e-mail: jmbdsj@kth.se).
Publisher Copyright:
© 2002-2012 IEEE.
PY - 2020/10
Y1 - 2020/10
N2 - Millimeter-wave using large-antenna arrays is a key technological component for the future cellular systems, where it is expected that hybrid beamforming along with quantized phase shifters will be used due to their implementation and cost efficiency. In this paper, we investigate the efficacy of full-duplex mmWave communication with hybrid beamforming using low-resolution phase shifters. We assume that the self-interference can be sufficiently cancelled by a combination of propagation domain and digital self-interference techniques, without any analog self-interference cancellation. We formulate the problem of joint self-interference suppression and downlink beamforming as a mixed-integer nonconvex joint optimization problem. We propose LowRes, a near-to-optimal solution using penalty dual decomposition. Numerical results indicate that LowRes using low-resolution phase shifters perform within 3% of the optimal solution that uses infinite phase shifter resolution. Moreover, even a single quantization bit outperforms half-duplex transmissions, respectively by 29% and 10% for both low and high residual self-interference scenarios, and for a wide range of practical antenna to radio-chain ratios. Thus, we conclude that 1-bit phase shifters suffice for full-duplex millimeter-wave communications, without requiring any additional new analog hardware.
AB - Millimeter-wave using large-antenna arrays is a key technological component for the future cellular systems, where it is expected that hybrid beamforming along with quantized phase shifters will be used due to their implementation and cost efficiency. In this paper, we investigate the efficacy of full-duplex mmWave communication with hybrid beamforming using low-resolution phase shifters. We assume that the self-interference can be sufficiently cancelled by a combination of propagation domain and digital self-interference techniques, without any analog self-interference cancellation. We formulate the problem of joint self-interference suppression and downlink beamforming as a mixed-integer nonconvex joint optimization problem. We propose LowRes, a near-to-optimal solution using penalty dual decomposition. Numerical results indicate that LowRes using low-resolution phase shifters perform within 3% of the optimal solution that uses infinite phase shifter resolution. Moreover, even a single quantization bit outperforms half-duplex transmissions, respectively by 29% and 10% for both low and high residual self-interference scenarios, and for a wide range of practical antenna to radio-chain ratios. Thus, we conclude that 1-bit phase shifters suffice for full-duplex millimeter-wave communications, without requiring any additional new analog hardware.
KW - Full-duplex systems
KW - digital cancellation
KW - hybrid beamforming
KW - massive MIMO
KW - millimeter wave
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U2 - 10.1109/TWC.2020.3006959
DO - 10.1109/TWC.2020.3006959
M3 - Article
AN - SCOPUS:85093704389
SN - 1536-1276
VL - 19
SP - 6916
EP - 6931
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 10
M1 - 9139277
ER -