Rain Attenuation at Terahertz

Ishii, Shigeyuki

doi:10.4236/wet.2010.12014

Cited by 26 publications

(10 citation statements)

References 11 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measurements of rain attenuation in [22], [23] indicate that the propagation experiment is in very good agreement with the calculation from the specific attenuation model for use in prediction method by ITU-R P.838-3 [24]. In addition, it can be concluded that the rain attenuation of THz wave is little affected by temperature.…”

Section: A Rain Attenuationsupporting

confidence: 64%

“…In addition, the precipitation attenuation caused by the interaction between the propagating waves and the raindrops and snowflakes has been studied in few experimental studies and limited lectures for the case of outdoor tests in adverse weather conditions which may pose a threat to sensitive measurement equipment. S.Ishii et al in [22], [23] calculated the rain attenuation at 313 GHz under a rainfall rate of up to 12 mm/h and at 355.2 GHz under a rainfall intensities up to 25 mm/h, where it was found that the prediction of ITU-R P.838-3 [24] has a good agreement with the results of these propagation experiment. In [25], the authors concluded that the rain attenuation of the THz wave increases with the increasing rainfall intensity, and the temperature has little effect on the rain attenuation.…”

Section: Introductionmentioning

confidence: 89%

See 1 more Smart Citation

Characterization for the Vehicle-to-Infrastructure Channel in Urban and Highway Scenarios at the Terahertz Band

Guan

et al. 2019

IEEE Access

View full text Add to dashboard Cite

With the challenge to form the networks of the Intelligent Transportation Systems (ITS), both technologies of vehicles and wireless communication are required to be connected tightly. In terms of wireless communication, the communication system in the terahertz (THz) frequency range with ultra-large bandwidth is a potential technology to support very high-data-rate wireless transmission at the age of beyond fifth-generation mobile communications (B5G). In this paper, the carrier frequency of 300 GHz with 8 GHz bandwidth vehicle-to-infrastructure (V2I) channel is characterized for the urban and highway scenario, respectively. The self-developed ray-tracing (RT) simulator is employed with the calibrated electromagnetic (EM) parameters. Since the wavelength of carrier frequency approaches the diameters of raindrops and snowflakes, the significant influence of the precipitation on the channel characterization is studied in our work as well. The large-scale parameters of the THz V2I channel, including path loss, Rician K -factor, root-mean-square (RMS) delay spread, and angular spreads are explored in the target scenarios under sunny, rainy, and snowy conditions, respectively. The channel characteristics studied in this paper can be used to support the link-level and system-level design for the future THz vehicular communications.INDEX TERMS Channel characteristics, ray-tracing simulation, terahertz communication, vehicle-toinfrastructure channel, wave propagation.

show abstract

Section: A Rain Attenuationsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 89%

Characterization for the Vehicle-to-Infrastructure Channel in Urban and Highway Scenarios at the Terahertz Band

Guan

et al. 2019

IEEE Access

View full text Add to dashboard Cite

show abstract

“…Encoding information that used NRZ encoding technique, whose "1" represents a significant bit and "0" for another considerable bit. The yield of the driver is also given to the subsystem of another MZM that has information levers [20]. The laser signal propagates through FSO with transmitter power 35 dBm and the divergence angle was 2 mrad.…”

Section: Design and Simulations Of Mimo Techniquementioning

confidence: 99%

Utilization of MIMO Concept for Optical Communication System under Fog Condition

Shakir¹,

Ali

Ameer³

2019

ECTI-EEC

View full text Add to dashboard Cite

Free-space optical (FSO) communication consider license free, high data rate, wide bandwidth and cost-effective. Multi-input Multi-output (MIMO) systems can be employed to reduce the attenuation by heavy fog and improve FSO channel capacity. In this paper a single-input single-output and multi–input multi-output examined to investigate the performance of these systems under heavy fog. A comparison is made in terms of received optical power, signal to noise ratio, and bit error rate (BER) using OptiSystem version 7.0. The signal reaches to link up to 1.7km, 1.55km, 1.5km, and 1.4km for 4Tx/4Rx, 3Tx/3Rx, 2Tx/2Rx, 1Tx/1Rxrespectively. The results showed that the quality of received power is enhancement by using up to four beams.

show abstract

“…where h 1 , h 2 , and h 3 are defined in (11)- (13), respectively, and σ w is the same as in (14). Parameter B is introduced for the accuracy improvement of the window frequencies and C is for the central frequencies of the rotational and vibrational absorption lines.…”

Section: Modified Model For Water Vapourmentioning

confidence: 99%

“…Experiments for snow and rain attenuation at frequencies of 96, 140, and 225 GHz were carried out by researchers of the Cold Regions Research and Engineering Laboratory in 1988 [13]. Ishii and colleagues measured the rain attenuation for frequencies of 313 and 355 GHz in 2010 [14] and 2011 [15], respectively.…”

Section: Introductionmentioning

confidence: 99%

Modified model of equivalent height for predicting atmospheric attenuation at frequencies below 350 GHz

Zhao

et al. 2018

IET Microwaves, Antennas & Propagation

View full text Add to dashboard Cite

Due to atmospheric absorption, the signal attenuation must be considered when designing communication links in the terahertz (THz) band. The equivalent height described in International Telecommunication Union Recommendation (Rec. ITU)‐R P.676 can be used to evaluate the signal attenuation over satellite links by meteorological parameters of the Earth's surface, which are relatively convenient to obtain. Since both temperature and water vapour content can greatly influence the absorption of THz waves and have temporal and spatial variability, the equivalent height should be a combined value representing the influences of temperature, water vapour, and pressure. However, only pressure is considered in the ITU‐R P.676 model. As a result, it will cause inaccuracies for different regions and seasons. In this study, a modified model of the equivalent height with temperature and water vapour near the Earth's surface is proposed. Compared with the forward equivalent heights, the equivalent heights based on both models are evaluated. Analyses of the window frequencies are performed, and improved results are achieved with the modified model, especially for mid‐ and high‐latitude winter profiles. The accuracy of the modified model for other profiles is also analysed and the results indicate its suitability.

show abstract

Rain Attenuation at Terahertz

Cited by 26 publications

References 11 publications

Characterization for the Vehicle-to-Infrastructure Channel in Urban and Highway Scenarios at the Terahertz Band

Characterization for the Vehicle-to-Infrastructure Channel in Urban and Highway Scenarios at the Terahertz Band

Utilization of MIMO Concept for Optical Communication System under Fog Condition

Modified model of equivalent height for predicting atmospheric attenuation at frequencies below 350 GHz

Contact Info

Product

Resources

About