Real-Time Millimeter-Wave MIMO Channel Sounder for Dynamic Directional Measurements

Bas, C. Umit; Wang, Rui; Sangodoyin, Seun; Psychoudakis, Dimitris; Henige, Thomas; Monroe, R. A.; Park, Jeong-Ho; Zhang, Charlie Jianzhong; Molisch, Andreas F.

doi:10.1109/tvt.2019.2928341

Cited by 63 publications

(47 citation statements)

References 44 publications

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“…Therefore, the required measurement times to acquire the channel characteristics at each transmitter and receiver location have to be reduced. To better temporally analyze the wireless propagation channel Bas & Molisch et al present in [17], [49] a MIMO channel sounder at 28 GHz based on a phased array structure that performs fast beam steering. Compared to channel sounders with rotating horn antennas the measurement time could drastically be reduced down to milliseconds [17].…”

Section: A Channel Measurements Around 28 Ghzmentioning

confidence: 99%

“…To better temporally analyze the wireless propagation channel Bas & Molisch et al present in [17], [49] a MIMO channel sounder at 28 GHz based on a phased array structure that performs fast beam steering. Compared to channel sounders with rotating horn antennas the measurement time could drastically be reduced down to milliseconds [17]. The channel sounder is used to analyze the outdoor to indoor propagation channel in [50], [51] and to estimate the angular spectrum, delay spread, and Doppler spectrum in an outdoor micro cellular scenario in [52].…”

Section: A Channel Measurements Around 28 Ghzmentioning

confidence: 99%

See 1 more Smart Citation

MIMO Communication Measurements in Small Cell Scenarios at 28 GHz

Eisenbeis¹,

Tingulstad²,

Kern³

et al. 2020

Preprint

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<p>Massive multiple-input multiple-output (MIMO) systems operating in the centimeter-wave (cmWave) and millimeter-wave (mmWave) region offer huge spectral efficiencies, which enable to satisfy the urgent need for higher data rates in mobile communication networks. However, the proper design of those massive MIMO systems first requires a deep understanding of the underlying wireless propagation channel. Therefore, we present a fully-digital MIMO measurement system operating around 28 GHz. The system enables to take fast subsequent snapshots of the complex MIMO channel matrix. Based on this method we statistically analyze the time-dependent channel behavior, the achievable signal quality and spectral efficiency, as well as the channel eigenvalue profile. Furthermore, the presented calibration approach for the receiver enables an estimation of the dominant absolute angle of arrival (AoA) and allows us to draw conclusions about the line-of-sight (LOS) dominance of the scenario. In total, 159 uplink communication measurements over 20 seconds are conducted in three different small cell site scenarios to investigate the wireless propagation behavior. The measurements reveal the existence of several spatial propagation paths between the mobile transmitter and the base station. Furthermore, an insight into their likelihood in different propagation scenarios is also given.</p>

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Section: A Channel Measurements Around 28 Ghzmentioning

confidence: 99%

Section: A Channel Measurements Around 28 Ghzmentioning

confidence: 99%

MIMO Communication Measurements in Small Cell Scenarios at 28 GHz

Eisenbeis¹,

Tingulstad²,

Kern³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…These schemes create a plane wave beam that can be electronically steered to point in any specific direction by phasing individual antenna elements; thus, these schemes offer high flexibility in terms of the ASI and HPBW compared with the antenna-switching scheme. [21] presented a real-time D-D channel sounder for the 28 GHz band that could perform horizontal and vertical beam steering with 8 × 2 phased arrays. D-D measurements can be performed in 1.44 ms by switching the beams rapidly.…”

Section: Introductionmentioning

confidence: 99%

Fast Double-Directional Full Azimuth Sweep Channel Sounder Using Low-Cost COTS Beamforming RF Transceivers

2021

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This paper presents a multipath component (MPC) parameter estimator that uses a double-directional (D-D) channel sounding system in WiGig millimeter-wave bands. It employs low-cost commercial-off-the-shelf (COTS) RF transceivers capable of beam steering within an azimuth angle range of ±45 • ; the transmit power is approximately 31 dBm, equivalent isotropic radiated power (EIRP), including a total antenna gain of approximately 19 dBi. The half-power beam widths in the azimuth and elevation planes are 6 • and 45 • , respectively. A fast D-D channel acquisition in 360 • full azimuth range can be achieved by developing a 4 × 4 multiple-input-multiple-output (MIMO) time division-multiplexing (TDM) scheme that enables simultaneous use of four antenna arrays at both sides of the transmitter and receiver. The beam switching for all combinations (48 × 48 = 2304) with 12 beams at each array requires less than 200 ms, excluding optional procedure related to data storage. A high-resolution MPC extraction method was developed from the D-D angular delay power spectra obtained using the sub-grid CLEAN algorithm, which is applicable when phase coherence among multiple snapshots obtained via the beam-switching measurement cannot be guaranteed. Furthermore, the operation of the developed system was validated via a measurement at 58.32 GHz in an office floor of a university laboratory. From the data analysis, the cluster properties and the corresponding scattering processes were identified.

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“…To this end, the channel parameters need to be continuously evolving as the UE moves into and out of regions that are covered by the BS with different propagation mechanisms. The authors of [4] present measured investigations into the dynamic behavior of mmWave channels characterizing the channel's delay and angular parameters. For system-level evaluation of performance, in order to model continuously evolving channels, the inclusion of spatial consistency (SC) is mandatory.…”

Section: Introductionmentioning

confidence: 99%

Impact of Spatially Consistent Channels on Digital Beamforming for Millimeter-Wave Systems : (Invited Paper)

Tataria

Tufvesson

2020

2020 14th European Conference on Antennas and Propagation (EuCAP)

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The premise of massive multiple-input multipleoutput (MIMO) is based around coherent transmission and detection. Majority of the vast literature on massive MIMO presents performance evaluations over simplified statistical propagation models. All such models are drop-based and do not ensure continuity of channel parameters. In this paper, we quantify the impact of spatially consistent (SC) models on beamforming for massive MIMO systems. We focus on the downlink of a 28 GHz multiuser urban microcellular scenario. Using the recently standardized Third Generation Partnership Project 38.901 SC-I procedure, we evaluate the signal-to-interference-plus-noise ratio of a user equipment and the system ergodic sum spectral efficiency with zero-forcing, block diagonalization, and signalto-leakage-plus-noise ratio beamforming. Across different user movement trajectories, our results disclose that SC channels yield a significant performance loss relative to the case without SC due to substantial spatial correlation across the channel parameters.

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Real-Time Millimeter-Wave MIMO Channel Sounder for Dynamic Directional Measurements

Cited by 63 publications

References 44 publications

MIMO Communication Measurements in Small Cell Scenarios at 28 GHz

MIMO Communication Measurements in Small Cell Scenarios at 28 GHz

Fast Double-Directional Full Azimuth Sweep Channel Sounder Using Low-Cost COTS Beamforming RF Transceivers

Impact of Spatially Consistent Channels on Digital Beamforming for Millimeter-Wave Systems : (Invited Paper)

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