Tropospheric Influence on Low-band Very High Frequency (VHF) Radio Waves

Ekah, Ukoette Jeremiah; Obi, Emmanuel; Ewona, Igwe

doi:10.9734/ajarr/2022/v16i11436

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…According to [15] increased Handover Failure Rate (HOFR) and inadequate network availability both within the communities and even when relocating were the main causes of the poor QoS. [16] in their studies stated that the Call Setup Success Rate, Call Setup Failure Rate (CSFR) and Handover Failure Rate were the most important Key Performance Indicators (KPIs) used in ascertaining the efficiency of GSM network in terms of the quality of services rendered. One of the most significant KPIs used by all mobile operators is the Call Setup Success Rate; however, since there is no standard way to measure this parameter, different operators may use different approaches.…”

Section: Previous Related Studiesmentioning

confidence: 99%

Statistical analysis of call setup success rate for 4 g networks in yenagoa-southern Nigeria

Chibuzo Emeruwa

2024

GSC Adv. Res. Rev.

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This work attempts to effectively compare Call Setup Success Rate CSSR against industry benchmarks and competitor networks to identify areas for improvement and sets performance targets. Four mobile telecommunication networks operational in Yenagoa – Southern Nigeria were considered. Results obtained shows that MTN and Airtel performed above the regulator’s benchmark of 98% in all cases, while Globacom and 9moblie had instances where their performance fell below the benchmark. The maximum values obtained within the period in view was 99.79% and it was gotten from 9mobile while the minimum value obtained was 94.07% and it was from Globacom. In the years 2017, 2019 and 2020 all the networks had values exceeding the NCC’s benchmark, this affirms that it is possible for the networks to perform optimally if adequate measures are put in place for improved QoS.

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Section: Previous Related Studiesmentioning

confidence: 99%

Statistical analysis of call setup success rate for 4 g networks in yenagoa-southern Nigeria

Chibuzo Emeruwa

2024

GSC Adv. Res. Rev.

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“…In this section, the longitudes and latitudes of each measured route and that of the base station, which serves as the reference point, is used to calculate the LOS distance of each location from the base station. The calculated LOS distance is then substituted into the free space propagation equation, given by [63] as:…”

Section: Analysis Of Free Space Propagation Modelmentioning

confidence: 99%

Tropospheric Influence on Ultra-High Frequency (UHF) Radio Waves

Iloke

Ekah

Ewona

2022

AJR2P

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This research investigates the effects of temperature and relative humidity on UHF signals. A spectrum analyzer was used in measuring UHF signals while a digital thermometer and hygrometer was used in measuring temperature and relative humidity, respectively. From results obtained, relative humidity had no significant effect on measured path loss while a positive correlation coefficient was obtained between temperature and measured path loss. This implies that an increase in temperature will lead to a decrease in received signal strength of UHF signals. Furthermore, a path loss propagation model for Calabar (PL = 37.920 + 2.796T + 0.290R + ) was obtained using multiple regression analysis and we believe that the obtained result will be useful to radio engineers for UHF signal propagation in the study terrain.

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“…Metrological variables refer to the atmospheric conditions that can affect the propagation of electromagnetic waves. Some of the key variables that can impact this include temperature, humidity, pressure, and atmospheric composition [1]. Temperature can affect the speed of electromagnetic waves, as warmer air tends to have a lower refractive index than cooler air.…”

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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Tropospheric Influence on Low-band Very High Frequency (VHF) Radio Waves

Cited by 4 publications

References 12 publications

Statistical analysis of call setup success rate for 4 g networks in yenagoa-southern Nigeria

Statistical analysis of call setup success rate for 4 g networks in yenagoa-southern Nigeria

Tropospheric Influence on Ultra-High Frequency (UHF) Radio Waves

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

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