Comparison between known propagation models using least squares tuning algorithm on 5.8 GHz in Amazon region cities

this paper presents a performance comparison between known propagation models through least squares tuning algorithm for 5.8 ghz frequency band. the studied environment is based on the 12 cities located in amazon region. after adjustments and simulations, sui model showed the smaller rms error and standard deviation when compared with cost231-hata and ecc-33 models.