RIS-enabled mmWave Channel Sounding Based on Electronically Reconfigurable Transmitarrays

Mudonhi, Alfred; Lotti, Marina; Clemente, Antonio; D’Errico, Raffaele; Oestges, Claude

doi:10.23919/eucap51087.2021.9411218

Cited by 10 publications

(7 citation statements)

References 11 publications

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“…For the receiver positions RX1, RX2, RX5 and RX6, the steering angle φ s,max , corresponding to the main lobe direction where the maximum power is received, is φ s,max = 0 • , while for the receiver positions RX3, RX4, RX7 and RX8, the main beams are in the steering directions φ s,max = 15 • , −15 • , 10 • , and −10 • respectively. In [9], the T-RIS was found to decrease both the path loss and delay spread (DS) for all receiver positions in the main lobe direction. As an example we consider here RX5 position.…”

Section: A Measured Channel Vs Synthesized Channelsmentioning

confidence: 96%

“…The T-RIS based measurement setup (Fig. 1 (a)) is based on 20 × 20 surface elements implementing a circularly polarized transmitarray [9], [10], presenting 18.7 dBic in the main steering direction, φ s = 0 • , while at maximum steering angle investigated, i.e. φ s = ±60 • the gain drops to 11.94 dBic, because of the array factor effect.…”

Section: Channel Measurement Campaign and Setupmentioning

confidence: 99%

“…In the past, fixed beam transmitarrays have already been used for channel characterization in the V-band for backscattering measurements [8], and preliminary results of T-RIS based antenna in the Ka band have been presented in [9] and have shown the impact of surface based beamforming.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we extend the results of [9] to evaluate how the structure of the channel is geometrically modified when a Transmitting-Reconfigurable Intelligent Surface (T-RIS) is employed. To this purpose, the one-plane omnidirectional channel is characterized in the same environment by using a Virtual Cubic Array (VCA) in Sec.…”

Section: Introductionmentioning

confidence: 99%

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Impact of a Transmitting-RIS on the Geometrical Structure of Indoor mmWave Channels

Mudonhi

Lotti

Clemente

et al. 2022

2022 16th European Conference on Antennas and Propagation (EuCAP)

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In this paper we investigate the impact of the use of Transmitting Reconfigurable Intelligent Surfaces (T-RISs) on the indoor millimeter wave (mmWave) radio channel characteristics. To this purpose, two measurement campaigns were conducted by employing a T-RIS array and a virtual cubic array (VCA). The multipath component extraction was performed to embed the T-RIS based antenna pattern and evaluate the effect on large-scale parameters such as the path loss, delay and angular spreads.

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Section: A Measured Channel Vs Synthesized Channelsmentioning

confidence: 96%

Section: Channel Measurement Campaign and Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impact of a Transmitting-RIS on the Geometrical Structure of Indoor mmWave Channels

Mudonhi

Lotti

Clemente

et al. 2022

2022 16th European Conference on Antennas and Propagation (EuCAP)

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“…In [47], RIS-assisted mmWave channel measurements were conducted in indoor laboratory and office environments. Different from the conventional case where the RIS is between the Tx and Rx, the RIS was utilized as Tx.…”

Section: Ris Channel Measurements and Experimentsmentioning

confidence: 99%

Reconfigurable Intelligent Surfaces: Channel Characterization and Modeling

et al. 2022

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Reconfigurable intelligent surfaces (RISs) are two dimensional (2D) metasurfaces which can intelligently manipulate electromagnetic waves by low-cost near passive reflecting elements. RIS is viewed as a potential key technology for the sixth generation (6G) wireless communication systems mainly due to its advantages in tuning wireless signals, thus smartly controlling propagation environments. In this paper, we aim at addressing channel characterization and modeling issues of RISassisted wireless communication systems. At first, the concept, principle, and potential applications of RIS are given. An overview of RIS based channel measurements and experiments is presented by classifying frequency bands, scenarios, system configurations, RIS constructions, experiment purposes, and channel observations. Then, RIS based channel characteristics are studied, including reflection and transmission, Doppler effect and multipath fading mitigation, channel reciprocity, channel hardening, rank improvement, far field and near field, etc. RIS based channel modeling works are investigated, including largescale path loss models and small-scale multipath fading models. At last, future research directions related to RIS-assisted channels are also discussed.Index Terms-6G wireless communications, reconfigurable intelligent surface (RIS), channel measurements, channel characteristics, channel modeling.

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