Beam Designs for Millimeter-Wave Backhaul With Dual-Polarized Uniform Planar Arrays

Kim, Sucheol; Choi, Junil; Song, Jiho

doi:10.1109/tcomm.2020.2982382

Cited by 6 publications

(4 citation statements)

References 40 publications

(153 reference statements)

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“…In [26], the authors proposed a novel channel estimation framework for dual-polarized MIMO systems operating in frequency division duplexing (FDD) mode. Hybrid beamforming strategies for dual-polarized millimeterwave MIMO systems were proposed in [27] and [28]. The work in [29] investigated the performance of a massive MIMO system with distributed polarized antennas, and dualpolarized MIMO systems assisted by intelligent reflecting surfaces (IRSs) were considered in [5], [6], and [30].…”

Section: A Related Workmentioning

confidence: 99%

Dual-Polarized Massive MIMO-RSMA Networks: Tackling Imperfect SIC

Sena

Nardelli

Costa

et al. 2023

IEEE Trans. Wireless Commun.

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The polarization domain provides an extra degree of freedom (DoF) for improving the performance of multiple-input multiple-output (MIMO) systems. This paper takes advantage of this additional DoF to alleviate practical issues of successive interference cancellation (SIC) in rate-splitting multiple access (RSMA) schemes. Specifically, we propose three dual-polarized downlink transmission approaches for a massive MIMO-RSMA network under the effects of polarization interference and residual errors of imperfect SIC. The first approach implements polarization multiplexing for transmitting the users' data messages, which removes the need to execute SIC in the reception. The second approach transmits replicas of users' messages in the two polarizations, which enables users to exploit diversity through the polarization domain. The third approach, in its turn, employs the original SIC-based RSMA technique per polarization, and this allows the BS to transmit two independent superimposed data streams simultaneously. An in-depth theoretical analysis is carried out, in which we derive tight closed-form approximations for the outage probabilities of the three proposed approaches. Accurate approximations for the ergodic sum-rates of the two first schemes are also derived. Simulation results validate the theoretical analysis and confirm the effectiveness of the proposed schemes. For instance, under low to moderate cross-polar interference, the results show that, even under high levels of residual SIC error, our dual-polarized MIMO-RSMA strategies outperform the conventional single-polarized MIMO-RSMA counterpart. It is also shown that the performance of all RSMA schemes is impressively higher than that of single and dual-polarized massive MIMO systems employing nonorthogonal multiple access (NOMA) and orthogonal multiple access (OMA) techniques.

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Section: A Related Workmentioning

confidence: 99%

Dual-Polarized Massive MIMO-RSMA Networks: Tackling Imperfect SIC

Sena

Nardelli

Costa

et al. 2023

IEEE Trans. Wireless Commun.

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“…Typically, each beamforming codeword covers a certain beam-region in the spatial frequency domain, which maps onto a geographic area. The conventional beamformer is designed to generate a beam pattern (BP) within an equally-spaced beam-region [34]- [36]. Assuming there are…”

Section: Downlink Beamformer Design Algorithmmentioning

confidence: 99%

“…Based on Parseval's theorem [37], the total amount of energy with respect to the BP over the entire beam-region is fixed to the finite value 2π M . In previous studies assuming a uniformly distributed beam direction, the length of each beam-region is evenly divided to uniformly split the energy over the spatial frequency domain [34]- [36]. However, it is not reasonable to assume that the directions of a dominant radio path are uniformly distributed, because wireless coverage in a V2I network is very different from that in conventional cellular networks.…”

Section: Downlink Beamformer Design Algorithmmentioning

confidence: 99%

Adaptive Beam Design for V2I Communications using Vehicle Tracking with Extended Kalman Filter

Hyun,

Song,

Kim

et al. 2021

Preprint

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A vehicle-to-everything communication system is a strong candidate for improving the driving experience and automotive safety by linking vehicles to wireless networks. To guarantee the full benefits of vehicle connectivity, it is essential to ensure a stable network connection between the roadside unit (RSU) and fast-moving vehicles. Based on an extended Kalman filter (EKF), we develop a beam-tracking algorithm to enable reliable radio connections. For the vehicle tracking algorithm, we focus on estimating the rapid changes in the beam direction of a high-mobility vehicle while reducing the feedback overhead. Furthermore, we design a beamforming codebook that considers the road layout and RSU. By leveraging the proposed beamforming codebook, vehicles on the road can expect a service quality similar to that of conventional cellular services. Finally, a beamformer selection algorithm is developed to secure sufficient gain for a link budget. Numerical results verify that the EKFbased vehicle tracking algorithm and the proposed beamforming structure are more suitable for vehicle-to-infrastructure networks compared to existing schemes.

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“…t are the channels of LOS path and NLOS paths, respectively. For dualpolarization UPA [28], they are, respectively, determined as follows:…”

Section: A Channel Modelmentioning

confidence: 99%

Phase Noise Effect on Millimeter-Wave Pre-5G Systems

Kim

2020

IEEE Access

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The introduction of millimeter waves for 5G wireless communication systems enables the use of more bandwidth and higher carrier frequency, surpassing the capacity of current systems by more than one order of magnitude. The leap of millimeter band results from the development of analog frontends that unfortunately induce relatively large phase noise in phase-locked loop synthesizers. Large phase noise may generate considerable random phase error and residual frequency offset, which in turn produces additional phase error. We evaluate phase error from phase noise on an implemented pre-5G system operating in the millimeter band and through a simulation by modeling the characteristics of a radio frequency integrated circuit. We measure and then compare the residual frequency offset, phase error, and error vector magnitude between the experimental and simulation results. We verify that the phase noise model suitably approximates to the real conditions. Moreover, we show that phase error remains at approximately 4 • in the implemented system. By exploiting the implemented phase error compensation, our pre-5G system can overcome a degradation of 1.5 dB in error vector magnitude and achieve an approximate transmission rate of 4 Gbps at gain of 1.49. INDEX TERMS 5G, millimeter-wave (mm-wave), 28GHz, phase noise (PN), carrier frequency offset, implementation

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Beam Designs for Millimeter-Wave Backhaul With Dual-Polarized Uniform Planar Arrays

Cited by 6 publications

References 40 publications

Dual-Polarized Massive MIMO-RSMA Networks: Tackling Imperfect SIC

Dual-Polarized Massive MIMO-RSMA Networks: Tackling Imperfect SIC

Adaptive Beam Design for V2I Communications using Vehicle Tracking with Extended Kalman Filter

Phase Noise Effect on Millimeter-Wave Pre-5G Systems

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