scholarly journals Office Room Channel Modeling and Object Attenuation at Sub-THz Frequencies

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1725
Author(s):  
Brecht De Beelde ◽  
Emmeric Tanghe ◽  
Claude Desset ◽  
André Bourdoux ◽  
David Plets ◽  
...  
Keyword(s):  
Wireless Communication ◽  
High Throughput ◽  
Communication Systems ◽  
Path Loss ◽  
Channel Modeling ◽  
Single Frequency ◽  
Line Of Sight ◽  
Channel Measurements ◽  
V Band ◽  
Computer Mouse

Large bandwidths are needed to meet the high-throughput requirements of future wireless communication systems. These larger bandwidths are available at mmWave and sub-THz frequencies, such as the V-band ranging from 50 to 75 GHz and the D-band ranging from 110 to 170 GHz. In this paper, we present channel measurements in an office environment, covering the full D-band. Line-of-Sight (LOS) path loss (PL) is modeled as a function of frequency and distance. Both a single-frequency floating-intercept and multi-frequency alpha-beta-gamma model provide a good fit to the measured LOS PL data. Attenuation due to blockage of the LOS path by various desk objects, such as computer peripherals and cables, is determined, as well as attenuation due to plant obstructions. Attenuation due to an obstructed LOS path ranges from 3 dB for a single universal serial bus (USB) cable, and up to 25 dB for a laptop power supply, computer mouse, computer monitor, or plant. Because of a higher diffraction angle, the measured attenuation is higher when the distance between the antennas decreases. We measure diffraction around a computer monitor for dual polarization and verify whether communication via the reflected non Line-of-Sight path makes high-throughput wireless communication possible when the LOS path is blocked.

scholarly journals Measurement of Path Loss Characterization and Prediction Modeling for Swarm UAVs Air-to-Air Wireless Communication Systems

2021 ◽  
pp. 228-235
Author(s):  
Sarun Duangsuwan ◽  
Keyword(s):  
Wireless Communication ◽  
Prediction Model ◽  
Communication Systems ◽  
Channel Model ◽  
Path Loss ◽  
Channel Modeling ◽  
Absolute Error ◽  
Wireless Communication Systems ◽  
Prediction Errors ◽  
Artificial Neural Network Ann

A challenge swarm unmanned aerial vehicles (swarm UAVs)-based wireless communication systems have been focused on channel modeling in various environments. In this paper, we present the characterized path loss air-to-air (A2A) channel modeling-based measurement and prediction model. The channel model was considered using A2A Two-Ray (A2AT-R) extended path loss modeling. The prediction model was considered using an artificial neural network (ANN) algorithm to train the measured dataset. To evaluate the measurement result, path loss models between the A2AT-R model and the prediction model are shown. We show that the prediction model using ANN is optimal to train the measured data for the A2A channel model. To discuss the result, the parametric prediction errors such as mean absolute error (MAE), root mean square error (RMSE), and R-square (R2), are performed.

scholarly journals EMR: A new metric to assess the resilience of directional mmWave channels to blockages

2021 ◽  
Vol 2 (2) ◽  
pp. 47-60
Author(s):  
Fatih Erden ◽  
Ozgur Ozdemir ◽  
Ismail Guvenc ◽  
David W. Matolak
Keyword(s):  
Communication Systems ◽  
Communication Channel ◽  
Path Loss ◽  
Spatial Diversity ◽  
Line Of Sight ◽  
Communication Link ◽  
Weighted Sum ◽  
Channel Measurements ◽  
Angular Domain ◽  
Cosine Distance

Millimeter-wave (mmWave) communication systems require narrow beams to compensate for high path loss and to increase the communication range. If an obstacle blocks the dominant communication direction, alternative paths (directions) should be quickly identified to maintain reliable connectivity. In this paper, we introduce a new metric to quantify the Effective Multipath Richness (EMR) of a directional communication channel in the angular domain. In particular, the proposed metric takes into account the strength and spatial diversity of the resolved Multipath Components (MPCs), while also considering the beamwidth of the communication link and the blockage characteristics. The metric is defined as a weighted sum of the number of distinct MPC clusters in the angular domain, where the clustering of the MPCs is performed based on the cosine-distance between the dominant MPCs. For a given transmitter (TX) and receiver (RX) pair, the EMR is a single scalar value that characterizes the robustness of the communication link against blockages, as it captures the number of unique communication directions that can be utilized. It is also possible to characterize the blockage robustness for the whole environment by evaluating the spatial distribution of the EMR metric considering various different TX/RX locations. Using our proposed metric, one can assess the scattering richness of different environments to achieve a particular service quality. We evaluate the proposed metric using our 28 GHz channel measurements in a library environment for Line-of-Sight (LOS) and NLOS scenarios, and compare it with some other commonly used propagation metrics. We argue that EMR is especially informative at higher frequencies, e.g., mmWave and terahertz (THz), where the propagation attenuation is high, and directional Non-Light-of-Sight (NLOS) communication is critical for the success of the network.

scholarly journals Directive mmWave radio channel modeling in a ship hull

2021 ◽  
pp. 1-12
Author(s):  
Brecht De Beelde ◽  
Andrés Almarcha Lopéz ◽  
David Plets ◽  
Marwan Yusuf ◽  
Emmeric Tanghe ◽  
...  
Keyword(s):  
Radio Channel ◽  
Path Loss ◽  
Channel Modeling ◽  
Ship Hull ◽  
Line Of Sight ◽  
Delay Spread ◽  
60 Ghz ◽  
Channel Measurements ◽  
Channel Sounder ◽  
Path Distance

Abstract Wireless connectivity has been realized for multiple environments and different frequency bands. However, little research exists about mmWave communication in industrial environments. This paper presents the 60 GHz double-directional radio channel for mmWave communication in a ship hull for Line-of-Sight (LOS) and non-Line-of-Sight (NLOS) conditions. We performed channel measurements using the Terragraph channel sounder at different locations in the ship hull and fitted LOS path loss to a one-slope path loss model. Path loss and root-mean-square delay spread of the LOS path is compared to the reflected path with lowest path loss. NLOS communication via this first-order reflected path is modeled by calculating the path distance and determining the reflection loss. The reflection losses have a considerable contribution to the signal attenuation of the reflected path. The channel models are implemented in an indoor coverage prediction tool, which was extended with a ray launching algorithm and validated by comparison with an analytical electromagnetic solver. The results show that the mmWave radio channel allows high-throughput communication within a ship hull compartment, even when no LOS path between the transmitter and receiver is present.

scholarly journals Propagation Channel Measurements in the mm- and Sub-mm Wave Range for Different Indoor Communication Scenarios

2021 ◽  
Vol 42 (4) ◽  
pp. 357-370
Author(s):  
M. A. Salhi ◽  
T. Kleine-Ostmann ◽  
T. Schrader
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Wireless Communication Systems ◽  
Electromagnetic Spectrum ◽  
Channel Measurements ◽  
Frequency Range ◽  
Propagation Channel ◽  
Data Rates ◽  
Indoor Wireless ◽  
Wave Range

AbstractIncreasing data rates in wireless communications are accompanied with the need for new unoccupied and unregulated bandwidth in the electromagnetic spectrum. Higher carrier frequencies in the lower THz frequency range might offer the solution for future indoor wireless communication systems with data rates of 100 Gbit/s and beyond that cannot be located elsewhere. In this review, we discuss propagation channel measurements in an extremely broad frequency range from 50 to 325 GHz in selected indoor communication scenarios including kiosk downloading, office room communication, living rooms, and typical industrial environments.

A Framework for Statistical Channel Modeling in 5G Wireless Communication Systems

2020 ◽  
pp. 31-54
Author(s):  
Caslav Stefanovic ◽  
Danijel Djosic ◽  
Stefan Panic ◽  
Dejan Milic ◽  
Mihajlo Stefanovic
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Channel Modeling ◽  
Wireless Communication Systems ◽  
Statistical Channel Modeling

scholarly journals High Throughput Line-of-Sight MIMO Systems for Next Generation Backhaul Applications

Frequenz ◽  
2017 ◽  
Vol 71 (9-10) ◽  
pp. 389-398
Author(s):  
Xiaohang Song ◽  
Darko Cvetkovski ◽  
Tim Hälsig ◽  
Wolfgang Rave ◽  
Gerhard Fettweis ◽  
...  
Keyword(s):  
High Throughput ◽  
Mimo Systems ◽  
Next Generation Networks ◽  
Line Of Sight ◽  
60 Ghz ◽  
Channel Measurements ◽  
Next Generation ◽  
Wireless Backhaul ◽  
Baseband Processing ◽  
Theoretical Foundations

Abstract The evolution to ultra-dense next generation networks requires a massive increase in throughput and deployment flexibility. Therefore, novel wireless backhaul solutions that can support these demands are needed. In this work we present an approach for a millimeter wave line-of-sight MIMO backhaul design, targeting transmission rates in the order of 100 Gbit/s. We provide theoretical foundations for the concept showcasing its potential, which are confirmed through channel measurements. Furthermore, we provide insights into the system design with respect to antenna array setup, baseband processing, synchronization, and channel equalization. Implementation in a 60 GHz demonstrator setup proves the feasibility of the system concept for high throughput backhauling in next generation networks.

scholarly journals Terahertz Channel Propagation Phenomena, Measurement Techniques and Modeling for 6G Wireless Communication Applications: a Survey, Open Challenges and Future Research Directions

2022 ◽  
Author(s):  
Demos Serghiou ◽  
Mohsen Khalily ◽  
Tim Brown ◽  
Rahim Tafazolli
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Measurement Techniques ◽  
Systems Design ◽  
Channel Modeling ◽  
Use Cases ◽  
Future Research ◽  
Potential Candidate ◽  
High Data ◽  
Wireless Communications Systems

The Terahertz (THz) band (0.1-3.0 THz) spans a great portion of the Radio Frequency (RF) spectrum that is mostly unoccupied and unregulated. It is a potential candidate for application in Sixth-Generation (6G) wireless networks as it has the capabilities of satisfying the high data rate and capacity requirements of future wireless communication systems. Profound knowledge of the propagation channel is crucial in communication systems design which nonetheless, is still at its infancy as channel modeling at THz frequencies has been mostly limited to characterizing fixed Point-to-Point (P2P) scenarios up to 300 GHz. Provided the technology matures enough and models adapt to the distinctive characteristics of the THz wave, future wireless communications systems will enable a plethora of new use cases and applications to be realized in addition to delivering higher spectral efficiencies that would ultimately enhance the Quality-of-Service (QoS) to the end user. In this paper, we provide an insight into THz channel propagation characteristics, measurement capabilities and modeling methods along with recommendations that will aid in the development of future models in the THz band. We survey the most recent and important measurement campaigns and modeling efforts found in literature based on the use cases and system requirements identified. Finally, we discuss the challenges and limitations of measurements and modeling at such high frequencies and contemplate the future research outlook toward realizing the 6G vision.

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