scholarly journals Effect of Some Meteorological Variables and Conditions on Mobile Phone and 'TV' Satellite Signal

2021 ◽  
Vol 32 (2) ◽  
pp. 71
Author(s):  
Hussain Abodi Nemah ◽  
Mohammed M. Ahmed ◽  
Omar L. Khaleed ◽  
Ghasaq S. Nemat
Keyword(s):  
Mobile Phone ◽  
Radio Wave ◽  
Weather Condition ◽  
Signal Strength ◽  
Wave Band ◽  
Microwave Band ◽  
Noticeable Effect ◽  
Uv Index ◽  
Band Signal ◽  
Signal Band

The study aimed to seek for the effect of meteorological parameters and conditions on wave transport for both radio wave band that used by mobile phone communication and microwave band that used in 'TV' satellites by showing which atmospheric variable and conditions have a positive or negative effect on signal strength. Data of study was recorded perfectly from one selected point by hand using the same devices for all recording to exclude the error caused by changing device types. The results showed that atmospheric conditions had a noticeable effect on microwave signal band that used by 'TV' satellite especially when there was a rainy case, and for atmospheric 'UV' index it had a direct positive effect on radio waveband used by mobile phone because there was an increase in signal strength corresponding with increasing of 'UV' index (from 1 to 5 of UV index range). For temperature, the result showed inverse proportion with radio waveband signal, but relative humidity didn't show up any relations with both study band's signals. Day time variation of signals was recorded for both wavebands, the result of radio waveband signal fluctuated in semi sine wave shape but with decreasing trend along day time, and for 'TV' satellite microwave band signal the result recorded increasing trend along day time, and this may because of solar radiation activity but in general, the satellite band signal was higher affected by weather condition as compared with mobile phone radio wave signal band.

scholarly journals Access Point Placement Recommendation Using Cost-231 Multiwall Propagation

2020 ◽  
Vol 10 (2) ◽  
pp. 103
Author(s):  
Fransiska Sisilia Mukti
Keyword(s):  
Wave Propagation ◽  
Distribution Pattern ◽  
Radio Wave ◽  
Signal Strength ◽  
Access Point ◽  
Propagation Model ◽  
Radio Wave Propagation ◽  
Signal Distribution ◽  
Point Placement

<p class="JGI-AbstractIsi">This study provides an overview of signal distribution pattern using Cost-231 Multi-Wall (MWM) propagation model. The signal distribution pattern is used as a reference in projecting indoor Access Points (AP) placement in Malang Institute of Asia. The MWM approach estimates the actual radio wave propagation value for measurements are made by considering obstacles between APs and user devices. The study recommends 10 optimal points of AP placement for the 1st, 3rd and 4th-floors, and 7 optimal points for the 2nd-floor. Determination of these placement points was based on the estimated signal strength obtained by users, at -50dBM up to - 10dBm, which is the range for good and excellent signal category.</p>

scholarly journals Improving Accuracy and Simplifying Training in Fingerprinting-Based Indoor Location Algorithms at Room Level

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
Mario Muñoz-Organero ◽  
Claudia Brito-Pacheco
Keyword(s):  
Artificial Intelligence ◽  
Radio Wave ◽  
Mobile Devices ◽  
Signal Strength ◽  
Received Signal Strength Indicator ◽  
Access Points ◽  
Indoor Location ◽  
Improving Accuracy ◽  
Indoor Location Systems ◽  
Decision Algorithms

Fingerprinting-based algorithms are popular in indoor location systems based on mobile devices. Comparing the RSSI (Received Signal Strength Indicator) from different radio wave transmitters, such as Wi-Fi access points, with prerecorded fingerprints from located points (using different artificial intelligence algorithms), fingerprinting-based systems can locate unknown points with a few meters resolution. However, training the system with already located fingerprints tends to be an expensive task both in time and in resources, especially if large areas are to be considered. Moreover, the decision algorithms tend to be of high memory and CPU consuming in such cases and so does the required time for obtaining the estimated location for a new fingerprint. In this paper, we study, propose, and validate a way to select the locations for the training fingerprints which reduces the amount of required points while improving the accuracy of the algorithms when locating points at room level resolution. We present a comparison of different artificial intelligence decision algorithms and select those with better results. We do a comparison with other systems in the literature and draw conclusions about the improvements obtained in our proposal. Moreover, some techniques such as filtering nonstable access points for improving accuracy are introduced, studied, and validated.

scholarly journals Verification of the Radio Wave Absorption Effect in the Millimeter Wave Band of SWCNTs and Conventional Carbon-Based Materials

2021 ◽  
Vol 11 (23) ◽  
pp. 11490
Author(s):  
Seiki Chiba ◽  
Mikio Waki
Keyword(s):  
Carbon Black ◽  
Radio Wave ◽  
Millimeter Wave ◽  
Coating Thickness ◽  
Measurement Method ◽  
Wave Band ◽  
Absorption Effect ◽  
Wave Absorption ◽  
Radio Wave Absorption ◽  
Millimeter Wave Band

Using a sample coated with three types of carbon-based paints, namely single-wall carbon nanotube (SWCNTs), carbon black, and graphite, the amount of radio wave absorption for each was measured. SWCNTs proved to have the superior radio wave absorption effect in the millimeter band. Considering the change in the amount of radio wave absorption depending on the coating amount, three different coating thicknesses were prepared for each test material. The measurement frequency was set to two frequency bands of 28 GHz and 75 GHz, and the measurement method was carried out based on Japanese Industrial Standard (JIS) R1679 “Radio wave absorption characteristic measurement method in the millimeter wave band of the radio wave absorber.” As for the amount of radio wave absorption in the 28 GHz band, a maximum amount of radio wave absorption of about 6 dB was obtained when 35 m of CNT spray paint was applied. It was confirmed that the carbon black paint came to about 60% that of the SWCNT, and the graphite paint did not obtain much radio wave absorption even when the coating thickness was changed. Furthermore, even in the 75 GHz band, the radio wave absorption was about 7 dB when 16 μm of CNT spray paint was applied, showing the maximum value. Within these experimental results, the CNT spray paint has a higher amount of radio wave absorption in the millimeter wave band than paints using general carbon materials. Its effectiveness could be confirmed even with a very thin coating thickness of 35 μm or less. It was also confirmed that even with the same paint, the radio wave absorption effect changes depending on the difference in coating thickness and the condition of the coated surface.

scholarly journals Call Your Leader: Does the Mobile Phone Affect Policymaking?

2018 ◽  
Author(s):  
Jahen Fachrul Rezki
Keyword(s):  
Civic Engagement ◽  
Mobile Phone ◽  
Mobile Phones ◽  
Rural Areas ◽  
Signal Strength ◽  
Lightning Strike ◽  
Rural People ◽  
Information And Communication ◽  
The Impact ◽  
The Village

This paper analyses the impact of Information and Communication Technology (ICT) on policymaking on an Indonesian Village level. In this study, I use data from different waves of the Indonesian Village Potential Statistics (Potensi Desa) to determine whether mobile phone signal strength affects village policies and civic engagement activities. The results indicate that villages with a strong signal are statistically more likely to possess the proper infrastructure and economic programs. Furthermore, mobile phones increase civic engagement, which is consistent with previous studies related to collective action or mass mobilisation. Using the plausibly exogenous variation of lightning strike intensity as the instrumental variable, this study suggests that higher mobile phone signal strength is positively associated with the policies implemented by the village head. This study also demonstrates that ICT has a stronger effect in rural areas. One possible explanation is that mobile phones improve the relative ability for rural people to interact with their leaders. Another potential answer is the fact that there are significant differences between rural village and urban village governments, which could also affect policymaking.

scholarly journals Analytical Solution of FSO-Mimo System Peformance Using DWDM Optical Communication

2021 ◽  
Vol 12 (2) ◽  
Author(s):  
J. Shanthini, Et. al.
Keyword(s):  
Quality Factor ◽  
Optical Communication ◽  
Bit Error Rate ◽  
Mimo System ◽  
Weather Condition ◽  
Signal Strength ◽  
Q Factor ◽  
Data Link ◽  
High Quality ◽  
Eye Diagram

Now days, in optical communication network challenge requirement are a high quality factor, good performance in terms of parameters like Bit Error Rate (BER), Eye Diagram. An objective of this paper, to analysis the attenuation value for a haze and normal weather condition respectively, and analysis, performance result of the different optical system has been compared in terms of received signal strength and quality factor of the different haze atmosphere. In this proposed paper used FSO with SISO and FSO-MIMO system for measuring the Q-factor and BER for various data link in different atmosphere. Finally, simulation result shows that the improved FSO link over the existing technique in terms of both the parameter signal power strength and quality factor.  

scholarly journals Millimeter-wave band subsurface sounding module

2021 ◽  
Vol 13 (4) ◽  
pp. 443--448
Author(s):  
Gennady I. Khokhlov ◽  
◽  
Roman N. Denisiuk ◽  
Keyword(s):  
Radio Wave ◽  
Building Materials ◽  
Experimental Testing ◽  
Dielectric Constants ◽  
Material Research ◽  
Wave Band ◽  
Visual Contact ◽  
Terahertz Band ◽  
Millimeter Wave Band ◽  
Electric Cables

Radio-wave devices are used for many environmental and material research tasks. These devices and the development of relatively simple and affordable quasi-optic radio wave receivers and transmitters of millimeter and terahertz bands are important for numerous applications. Results of the design of a terahertz-band quasioptical transmitter-receiver module are presented. The module is intended for the remote detection of various objects and for measuring the depolarized field components backscattered by various long objects hidden behind obstacles (building materials and/or everyday items that prevent visual contact with the objects). These may be interfaces between materials with different dielectric constants, fiber optic cables, electric cables, and otherobjects. Results of full-scale experimental testing of the module on the detection of electric cables buried under plater in the wall of a building are presented.

scholarly journals Experimental Circuit Model for Increasing the Signal Strength level of a Mobile Phone into a Lift

2021 ◽  
Vol 10 (2) ◽  
pp. 1065-1072
Keyword(s):  
Optical Fiber ◽  
Mobile Phone ◽  
Rapid Change ◽  
Path Loss ◽  
Window Size ◽  
Signal Strength ◽  
Optical Signal ◽  
Electrical Signal ◽  
Circuit Model ◽  
Strength Level

Due to rapid change in human lifestyle in recent years, the demand for constructing a building is very high. On the other hand due to the construction of buildings the signal strength level into the lift of that building is very low which is known as the transmission path loss. Path loss may be arising due to reflection, refraction and scattering. Path loss is a function of frequency and time. An innovative circuit model is developed for predicting wireless signal coverage into the lift. In this paper, we propose a simulated circuit model to reduce the penetration loss based on the measurement of window size, temperature, and humidity conditions etc. An outdoor antenna is used to receive the electromagnetic signals from the surrounding environment. The received signals are oscillated by the oscillator circuit. After this, it is amplified and converted into an optical signal. For better performance, this signal is transmitted through the optical fiber. The optical fiber is entered into the wire which is used to move (up-down) the lift. At the last end of the fiber, it is connected to a device which converts this optical signal into an electrical signal. This signal is sent to the indoor model and after amplifying the signal it is transmitted through the indoor antenna. The mobile phone antenna receives that signal and finally it is amplified and sent to the speaker of the mobile phone. This model works on 4G/3G/2G networks. Our model enhanced the signal strength level in the lift, which is the same outside the lift. It also measured that the signal strength level was the same at the top and ground floor. Required transmitting power is lower than previous methods

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