This lesson covers the intricate details of mobile radio propagation mechanisms. It delves into the free space propagation model, small scale propagation model, and large scale propagation model. The lesson also explores the Log-Distance Path Loss Model, which is crucial in urban areas, and the Log-Normal Shadowing model, a more realistic model. The lesson further explains the impact of various factors such as reflection, diffraction, and scattering on signal strength and propagation. It also discusses the importance of propagation models in determining the coverage area of a transmitter, optimizing cell life, and predicting appropriate modulation and coding schemes.

- Free space propagation model is valid in many applications and forms the basis for other models.
- Small scale propagation model is used when the mobile moves over small distances, causing the instantaneous received signal to fluctuate rapidly.
- Large scale propagation model is used when the mobile moves away from the transmitter over a large distance, causing the local average of the received signal to gradually decrease.
- Log-Distance Path Loss Model is important in urban areas where the received signal power decreases logarithmically with distance.
- Log-Normal Shadowing model is a more realistic model that takes into account the shadowing effects due to cluttering on the propagation path.

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