Quantitative analyses of complexity and nonlinear trend of radio refractivity gradient in the troposphere

Adelakun, A. O.; Ojo, J. S.; Edward, O.V.

doi:10.1016/j.asr.2019.09.055

Cited by 7 publications

(4 citation statements)

References 17 publications

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“…In addition, a chaotic system can also occur if one of the Lyapunov exponent is positive and hyperchaotic if two of the Lyapunov exponents is positive. The largest Lyapunov exponent λ1 can be used to determine the rate of divergence [18][19][20] as:…”

Section: Chaotic Dynamics Analysismentioning

confidence: 99%

Chaotic assessment of the key performance indicators for a GSM Network congestion in an election period in Nigeria

Adelakun¹,

Lawal²,

Adekoya³

et al. 2020

njpap

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This paper investigates the chaos-based assessment of the Key performance Indicators (KPIs) for the Cellular network congestion during and after 2011 People Democratic Party (PDP) presidential primary election in Eagle Square within Abuja and its environs. Chaotic quantifiers such as average mutual information, Lyapunov exponents and specific attenuation were employed to study the congestion rate or dynamical state of the network. The chaotic assessment of the Wideband Code Division Multiplexing Access (WCDMA) data services provided by MTN network using KPIs are reported. The data retrieved from the three Base Transceiver Stations (BTSs) were used to analyse the performance of the network. The results revealed the state of dynamical behaviour of the congestion during the study period. Keywords: Key performance Indicators (KPIs); Wideband Code Division Multiplexing Access (WCDMA); Global System of Mobile communication (GSM); Base Transceiver Station (BTS); Chaotic Quantifiers

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Section: Chaotic Dynamics Analysismentioning

confidence: 99%

Chaotic assessment of the key performance indicators for a GSM Network congestion in an election period in Nigeria

Adelakun¹,

Lawal²,

Adekoya³

et al. 2020

njpap

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“…Researchers in Nigeria, such as [1], [3], [13], [15]- [22] have worked on the effect of atmospheric factors on radio propagation, but latitudinal variations of some specific locations considered in this work have not been dealt with extensively considering the two major seasons usually experience in Nigeria.…”

Section: Introductionmentioning

confidence: 99%

Seasonal and latitudinal variations of surface radio refractivity over Nigeria

Sanyaolu

Olufemi

2022

IJEECS

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Refractivity is a significant challenge of radio signal propagation. As it often distorts or leads to loss of signals. The seasonal and latitudinal variations of surface refractivity at three Nigerian tropospheric Observatory stations in Nigeria, namely Port-Harcourt, Lagos, and Makurdi, are presented in this paper. Values of monthly averages of pressure, temperature, relative humidity, and water vapour from the stations were used to compute surface refractivity at each station. The results show that the values of surface refractivity increase from the arid region in the north to the coastal area in the south. There was an increase in the values of surface radio refractivity from the minimum value of about 332.83 N-units at Makurdi station to a maximum value of 386.69 N-units at Lagos station. Seasonal variations are seen to be caused by weather conditions. The values of the surface refractivity increased significantly in the wet season and reduced in the dry season. It also shows that the values of surface radio refractivity are affected by the meteorological components mentioned above. The result of this study is needed for effective planning of good signal reception in these stations.

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“…Ogunjo et al (2016) investigated chaos in surface radio refractivity in eleven locations over Nigeria using Brock-Dechert-Scheinkmen (BDS) test and reported that the BDS values in the dry season for surface radio refractivity are in a state of chaos while surface radio refractivity in rainy seasons was found to be regular. The degree of the complexity and nonlinear trends of Radio Refractivity Gradient (RRG) in the troposphere over selected locations in Nigeria were investigated (Adelakun et al, 2019;Ojo et al, 2019). Fuwape and Ogunjo (2016), also considered different quantification parameters including the Hurst exponents, LLE correlation dimension, recurrence quantification analysis (RQA) for the analysis of the forecast data from (ECMWF) and (ERA-interim) project.…”

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confidence: 99%

Characterization and Investigation of Nonlinear Behaviour of Radio Refractivity during the Rainy and Dry Seasons in the Coastal Region of Nigeria

Adeniji¹,

Ajeigbe²,

Ojo³

2021

jasem

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The transmission and receiving of good quality of signals globally has been impaired due to the internal activities of the troposphere linked to the nonlinear behaviour of the meteorological parameters. This paper focusses on characterizing and investigating the nonlinear behaviour of radio refractivity during the rainy and dry seasons in the coastal region of Nigeria using temperature, pressure and relative humidity data collected over a period of two years by the Centre for Atmospheric Research, National Space Research and Development Agency (NASRDA) from Lagos state. Data obtained were analyzed by False Nearest Neighbour (FNN) and Recurrence Quantification Analysis (RQA). The results show that recurrence techniques are able to identify the periods where there are high predictability and low predictability. The investigation of nonlinear effects of meteorological parameters and the hydrometeors on the troposphere help to avoid fading of radio signals along with the radio communication links.

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Quantitative analyses of complexity and nonlinear trend of radio refractivity gradient in the troposphere

Cited by 7 publications

References 17 publications

Chaotic assessment of the key performance indicators for a GSM Network congestion in an election period in Nigeria

Chaotic assessment of the key performance indicators for a GSM Network congestion in an election period in Nigeria

Seasonal and latitudinal variations of surface radio refractivity over Nigeria

Characterization and Investigation of Nonlinear Behaviour of Radio Refractivity during the Rainy and Dry Seasons in the Coastal Region of Nigeria

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