Comparative Analysis of Tropospheric Radio Refractivity during Rainy Season in Calabar, Nigeria

Iloke, J. I.

doi:10.22214/ijraset.2020.1072

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…They found variation of refractive index of atmosphere with temperature and humidity. In same area observation were done by J. I. Iloke et al 15) and found a linear relationship between water vapor pressure & refractivity with R 2 is 0.9902. Relationship between refractivity & temperature with R 2 is 0.8442, for 10 years (2010-2019) during rainy season.…”

Section: Related Workmentioning

confidence: 56%

Use of RSM Technology for the Optimization of Received Signal Strength for LTE Signals Under the Influence of Varying Atmospheric Conditions

Choudhary¹,

Sharma²,

Gupta³

et al. 2020

Evergreen

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In the field of telecommunication, network planning plays an important role to maximize the system performance and it is very much related to received signal strength (RSS). While transmitting signal from the transmitter to the receiver, signal has to face so many obstacles like varying environment conditions, high-rise buildings, dense forests etc. Signal strength gets affected with varying distance between the transmitter and receiver too. So for efficient network planning, information about the effect of all these parameters on received signal strength (RSS) should be known to us. So this study aimed to investigate the variation in Received Signal Strength for LTE signal (RSSLTE) with respect to the variation of four input parameters i.e. Relative humidity (25 % to 75 %), Temperature (12 °C to 48 °C), Air quality index for Particulate Matter 2.5 (50 to 500) and Distance from the base station (98 m to 300 m). Optimization of received signal strength was also carried out by using response surface methodology. Optimum value of received Signal Strength for LTE signal (RSSLTE) was found to be -87.0393 dBm when the input parameters i.e.

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Section: Related Workmentioning

confidence: 56%

Use of RSM Technology for the Optimization of Received Signal Strength for LTE Signals Under the Influence of Varying Atmospheric Conditions

Choudhary¹,

Sharma²,

Gupta³

et al. 2020

Evergreen

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“…Te efect of atmospheric pressure is almost insignifcant since the range of average atmospheric pressure throughout the year is inconsiderable. Oku et al [99] said the average radio refractivity of Calabar for the rainy season is higher than that of the dry season for a better part of the year; however, there are overlapping points in the radio refractivity profle of the two seasons. Tey said this is an indication that the climatic condition of Calabar contributes to just a slight variation in seasonal refractivity as compared to studies in other regions of the country with a clear diference between the rainy and dry season refractivity.…”

Section: Resultsmentioning

confidence: 99%

Radio Refractivity Impact on Signal Strength of Mobile Communication

Amajama,

Asagha,

Ushie

et al. 2023

Journal of Electrical and Computer Engineering

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This research investigated radio refractivity impact on signal strength of mobile communication. The mobile communication signal strengths of two popular networks in Nigeria, 9Mobile and MTN, were considered. In the 2100 MHz-3 G band, 9Mobile transmits in the downlink spectrum of 2130.00–2140.00 MHz, while MTN transmits in the downlink spectrum of 2110.00–2120.00 MHz. Also, 9Mobile transmits in the downlink spectrum of 791–821 MHz in the 800 MHz band and 1805–1880 MHz in the 1800 MHz, while MTN transmits in the downlink spectrums of 2620–2690 MHz in the 2600 MHz band; all in the 4 G band. Using the instrument of a mobile station in each station (location) in some selected cities in southern Nigeria, the signal strengths were measured. A cell signal monitor (version 5.1.1) mobile application installed in an Android (transceiver) device (having two SIM slots) constituted the mobile station. To achieve high accuracy, there was a restriction in measuring transmission from specific cells. Hourly measurement of signal strengths was carried out and instantaneously corresponding weather parameters were recorded. Weather parameters for this investigation; atmospheric temperature and pressure; and relative humidity were excerpted online from the Nigeria Meteorological Agency (NIMET) hourly weather report for the various cities where the stations were situated. The hourly radio refractivity was computed using the 2015 International Telecommunication Union–Radio-communication sector (ITU-R) recommended model. Overall, the results indicate that there was no established linear relationship between signal strength and radio refractivity since the overall average R value is 0.0123691 and the overall average standard deviation of R values is 0.1112165. The inconsistencies in the linear relationships obtained from different locations and cells could be due to variations in topography, antenna properties, seasonal variations, wind and position, and distance of the receiver from the transmitter.

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“…In the management and planning stages of radio communication systems, the areas of the atmosphere that radio signals pass through throughout the transmission process from the radio transmitters to the radio receivers, which is primarily controlled by propagation pattern, are crucial [3]. Any radio signal transmission system's radio connections are inevitably vulnerable to fluctuations in climatic variability, which might cause serious system performance degradation [3,5,6]. In order to manage and take the appropriate actions and adaption choices for its mitigation and management, it is crucial to examine these aspects that affect the radio link quality in these radio signal communication systems [7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of some weather variables' impacts on UHF and VHF receivers in Yenagoa Southern, Nigeria

Chibuzo Emeruwa

2023

World J. Adv. Res. Rev.

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In this study, the effects of some important meteorological variables, such as temperature, relative humidity, and mean sea level pressure, were assessed on the Ultra High Frequency (UHF) radio signals from Niger Delta Television (NDTV), transmitting at 743.25 MHz UHF, and the Very High Frequency (VHF) radio signals from Nigerian Television Authority (NTA), transmitting at 189.25 MHz VHF, both in Yenagoa, Southern Nigeria, within 6°20'17"N and 5°37’32″E. The Digital Community- Access/Cable Television (CATV) analyzer was used to measure the radio signal strength from NDTV and the radio signal strength from NTA Yenagoa, and a self-implemented weather monitoring device was used to measure the weather variables simultaneously at an equal distance within the Metropolis. Throughout the entire year of 2022, measurements were made continuously every six hours (respectively between 12 am and 1 am, 6 am and 7 am, 12 pm and 1 pm, and 6 pm and 7 pm local time). The results showed that the radio signals from both UHF and VHF television stations were directly proportional to temperature, inversely proportional to relative humidity, and did not follow any specific pattern of proportionality with mean sea level pressure. Inferentially, it was seen that these meteorological factors mostly affected the radio signals from the UHF television station, and that these impacts were stronger during the months with high relative humidity compared to the months with lower relative humidity. But based on these findings, a postulation has been put out that has to be verified further. These findings and the proposed postulation, it is thought, would undoubtedly be beneficial in supporting and directing the management of radio communication networks for planning and other reasons.

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Comparative Analysis of Tropospheric Radio Refractivity during Rainy Season in Calabar, Nigeria

Cited by 3 publications

References 3 publications

Use of RSM Technology for the Optimization of Received Signal Strength for LTE Signals Under the Influence of Varying Atmospheric Conditions

Use of RSM Technology for the Optimization of Received Signal Strength for LTE Signals Under the Influence of Varying Atmospheric Conditions

Radio Refractivity Impact on Signal Strength of Mobile Communication

Analysis of some weather variables' impacts on UHF and VHF receivers in Yenagoa Southern, Nigeria

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