This document presents channel models for fixed wireless applications, focusing on path loss, multipath delay spread, fading characteristics, Doppler spectrum, and antenna gain reduction factors. It discusses the Hata-Okumura model for path loss, which is extended to account for different frequencies and antenna heights. The model also includes correction terms for frequency and receive antenna height. The Cost 231 Walfish-Ikegami model is compared with empirical data and found to be suitable for suburban and urban environments. The document also describes the multipath delay profile, RMS delay spread, fading characteristics, and K-factor, which are essential for modeling wireless channels. The Doppler spectrum is discussed, with a rounded model used for simulations. The coherence distance and co-channel interference are also addressed, along with the antenna gain reduction factor (GRF), which accounts for signal loss due to scattering. The document introduces modified Stanford University Interim (SUI) channel models for fixed broadband wireless applications, which include parameters for different terrain types and antenna configurations. These models are used for simulations, design, and testing of wireless technologies. The paper concludes that the proposed models provide a comprehensive framework for fixed broadband wireless systems, covering diverse terrain types and performance requirements.This document presents channel models for fixed wireless applications, focusing on path loss, multipath delay spread, fading characteristics, Doppler spectrum, and antenna gain reduction factors. It discusses the Hata-Okumura model for path loss, which is extended to account for different frequencies and antenna heights. The model also includes correction terms for frequency and receive antenna height. The Cost 231 Walfish-Ikegami model is compared with empirical data and found to be suitable for suburban and urban environments. The document also describes the multipath delay profile, RMS delay spread, fading characteristics, and K-factor, which are essential for modeling wireless channels. The Doppler spectrum is discussed, with a rounded model used for simulations. The coherence distance and co-channel interference are also addressed, along with the antenna gain reduction factor (GRF), which accounts for signal loss due to scattering. The document introduces modified Stanford University Interim (SUI) channel models for fixed broadband wireless applications, which include parameters for different terrain types and antenna configurations. These models are used for simulations, design, and testing of wireless technologies. The paper concludes that the proposed models provide a comprehensive framework for fixed broadband wireless systems, covering diverse terrain types and performance requirements.