E Model Development for Land Mobile Radio System

International Journal of Electrical and Electronics Engineering

© 2023 by SSRG - IJEEE Journal

Volume 10 Issue 2

Year of Publication : 2023

Authors : Vivekanand Krishnaji Joshi, Kavitha

10.14445/23488379/IJEEE-V10I2P109

How to Cite?

Vivekanand Krishnaji Joshi, Kavitha, "E Model Development for Land Mobile Radio System," SSRG International Journal of Electrical and Electronics Engineering, vol. 10,  no. 2, pp. 92-101, 2023. Crossref, https://doi.org/10.14445/23488379/IJEEE-V10I2P109

Abstract:

The Land Mobile Radio System provides a radio voice broadcast system in public and private domains. Public Land Mobile Radio System is used by government departments like police, fire, and ambulance to provide security and safety services to the common man. In these services, radio speech quality is the prime factor for evaluating the performance of radio networks. There are different standards laid for speech quality assessment. ITU-T recommendations G.107, named as E model, is the first step, which provides a unique method to calculate speech quality for telephone networks once all related parameters are known. Later its successive model, G.107.1 and G.107.2 were also developed, but those were focused on wideband and full-band telephone networks. With this background, we have analyzed Land Mobile Radio System used by State Police Department. The study aims to develop a general formula to calculate speech quality based on known radio and its network parameters. E model has developed a formula for speech quality, which relates speech quality to Received RF Signal Strength, Signal Noise Ratio, Signal Interference Ratio, Deviation and Frequency Drift. Our model is successfully implemented on different network architectures used in LMRS System. Results are supported by different statistical methods and have proven successful. They are also tested in the field for different geographical conditions and found 90 to 95 accurate. This model can be used as a Speech Quality Design tool for designing and planning an analogue radio network.

Keywords:

Wireless E model, Objective speech quality, Analogue modulation, Deviation, Link budget, Repeaters, Link repeater, Signal to noise ratio, Signal to interference ration, Channel spacing, Path loss, Frequency drift, Spectrum analyzer, MOS.

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