Experimental Characterization of Millimeter-Wave Indoor Propagation Channels at 28 GHz

Zhang, Guojin; Saito, Kentaro; Fan, Wei; Cai, Xuesong; Hanpinitsak, Panawit; Takada, Jun‐ichi

doi:10.1109/access.2018.2882644

Cited by 31 publications

(27 citation statements)

References 24 publications

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“…after each measurement sweep. The measurements were conducted in a hall environment [49], which is a large room with few scattering objects. The floor plan as well as 20 Tx snapshots and major objects along with their corresponding PO models are depicted in Fig.…”

Section: Shf Band Channel Measurement and Po Object Modelmentioning

confidence: 99%

Frequency Characteristics of Geometry-Based Clusters in Indoor Hall Environment at SHF Bands

et al. 2019

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This paper presents an analysis of geometry-based cluster frequency dependency at super-highfrequency bands, including 3, 10, and 28 GHz. First, multipath components were extracted from the measured data by using the space-alternating generalized expectation-maximization algorithm. Then, geometry-based clusters were estimated by using the enhanced scattering point-based KPowerMeans (SPKPM) algorithm. Finally, the frequency dependencies of their scattering intensities were discussed with the assistance of physical optics. The analysis results showed that the SPKPM could also be applied to obtain reasonable scattering locations at multiple frequencies in most cases. In addition, reflection on smooth surfaces was the dominant mechanism of clustering where there was no frequency dependence, whereas diffraction, scattering, and shadowing were significant causes of frequency dependence. Assuming that the line-of-sight is obstructed, diffraction, scattering, and shadowing accounted for 30-40% of the entire channel in terms of power, which was not negligible and thus the channel was largely frequency-dependent. The analysis results are expected to provide crucial insights for multiple-frequency channel modeling for fifth-generation wireless systems. INDEX TERMS Radio propagation, SHF bands, indoor, MPC clustering, channel models, physical optics. I. INTRODUCTION Owing to the large available bandwidth and the possibility to construct a compact antenna array with a large number of elements, millimeter wave (mmWave) bands have been suggested as the primary enabler of fifth-generation (5G) communication systems [1], [2], in order to accommodate a dramatic increase in data traffic. However, the transmitted signals suffer from larger free space path loss in these bands. Furthermore, the performance is more susceptible to shadowing and mobile station movement. Thus, to compensate for these effects as well as to ensure compliance with strict regulations, it is possible that a very large bandwidth or several subbands from the microwave to mmWave bands may be The associate editor coordinating the review of this manuscript and approving it for publication was Jose Saldana.

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Section: Shf Band Channel Measurement and Po Object Modelmentioning

confidence: 99%

Frequency Characteristics of Geometry-Based Clusters in Indoor Hall Environment at SHF Bands

et al. 2019

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“…In order to meet the great requirements of wireless communication, mmWave communication has recently gained considerable interest in both academia and industry as a promising candidate in the future cellular network [1], [2]. Due to mmWave has the large band of spectrum resource with 30GHz to 300GHz, it can provide higher data rate in wireless communication and be widely applied in the communication fields such as radar, backhaul, satellite communications, wireless local area network (WLAN), and…”

Section: Introductionmentioning

confidence: 99%

Optimal Hybrid Beamforming Design for Millimeter-Wave Massive Multi-User MIMO Relay Systems

Zhang

Yuan-zhi

et al. 2019

IEEE Access

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As a promising technology in the next generation mobile network, millimeter-wave (mmWave) communication can mitigate the spectrum crunch of improving the network capacity by exploiting the large underutilized spectrum bands of the mmWave frequencies. The hybrid (analog/digital) beamforming of multi-data streams are widely used to further the spectrum efficiency of mmWave relay system when faced with the complex environment or long distance communication. This paper investigates the hybrid beamforming scheme for the decode-and-forward (DF) mmWave massive multiple-input multiple-output (MIMO) relay system with mixed structure and full-connected structure. We optimize hybrid beamforming of relay system by maximizing the sum rate of the overall system as an objective function. To reduce the computational complexity, we reformulate the original problem as two single-hop mmWave MIMO sum-rate maximization subproblems. Then, the piecewise successive approximation method is proposed based on the criterion which jointly designs the analog and digital beamforming stages by trying to avoid the loss of information at each stage. The hybrid beamforming of the two subproblems can be solved by the proposed scheme united with the idea of successive interference cancelation (SIC), the baseband block diagonalization (BD) scheme, and waterfilling power allocation method. Finally, simulation results confirm that the proposed optimal method can achieve good performance in hybrid beamforming design of relay system with both mixed and full-connected structures.

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“…The analysis of the computational complexity of the proposed LrHPC algorithm is premised on the number of multiplications of several matrix operations. We can observe that the complexity of Algorithm 3 for the hybrid transmit precoder (since the hybrid receive combiner experiences the same complexity), is mainly due to steps 2, 4, 19 3 complex multiplications and the matrix inversion has a computational complexity of O (N RF t ) 3 . Therefore, this totally requires a computational complexity 3 .…”

Section: B Discussion On Computational Complexitymentioning

confidence: 99%

On the Spectral-Efficiency of Low-Complexity and Resolution Hybrid Precoding and Combining Transceivers for mmWave MIMO Systems

et al. 2019

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Millimeter wave (mmWave) multiple-input-multiple-output (MIMO) systems will almost certainly use hybrid precoding to realize beamforming with few numbers of RF chains to reduce energy consumption, but require low complexity technique to improve spectral efficiency. While energy-efficient hybrid analog/digital precoders and combiners designs can subdue the high pathloss inherent in mmWave channels, they assume the use of infinite-(or high-) resolution phase shifters to realize the analog precoder and combiner pair which results in high hardware cost and power consumption. One promising solution is to employ the use of low-resolution phase shifters. In this paper, we first diverse the exploration of multiple candidates of array response vectors, to propose low-complexity hybrid precoder and combiner (LcHPC) design via stage-determined matching pursuit (SdMP) namely, LcHPC-SdMP for pursuing better achievable rate for mmWave MIMO systems. We initially decouple the joint optimization over hybrid precoders and combiners into two separate sparse recovery problems. Specifically, LcHPC-SdMP algorithm revises the identification step of orthogonal matching pursuit (OMP) to the selection of multiple ''correct'' column indices of the matrix of array response vectors, per iteration. Then adds a pruning step −after satisfying a sparsity level condition, to iteratively refine the sparse solution which aids in further accelerating the algorithm, by requiring fewer iterations. We then propose an algorithm which iteratively designs low-resolution (two-bit) hybrid analog-digital precoder and combiner (LrHPC), for pursuing efficiency while maximizing spectral efficiency. Simulation results demonstrate that the proposed LcHPC-SdMP algorithm performs very close to its full-digital precoding and achieves better spectral efficiency over state-of-the-art algorithms with a substantially reduced number of iteration than the recently proposed schemes. In addition, simulation results also reveal that the achievable rate of the proposed LrHPC algorithm is higher than those of the existing algorithms under consideration.

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Experimental Characterization of Millimeter-Wave Indoor Propagation Channels at 28 GHz

Cited by 31 publications

References 24 publications

Frequency Characteristics of Geometry-Based Clusters in Indoor Hall Environment at SHF Bands

Frequency Characteristics of Geometry-Based Clusters in Indoor Hall Environment at SHF Bands

Optimal Hybrid Beamforming Design for Millimeter-Wave Massive Multi-User MIMO Relay Systems

On the Spectral-Efficiency of Low-Complexity and Resolution Hybrid Precoding and Combining Transceivers for mmWave MIMO Systems

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