Radiosity method: a new propagation model for microcellular communication

We discuss the development of a new three-dimensional model applicable for characterizing the propagation characteristics for microcellular communications. For microcellular communication, the working frequency is about 1.7-2.0 GHz. The wavelength is about 15-18 cm. In essence, these wavelengths are comparable with the dimensions of cavities such as windows, balconies, etc. on buildings. Thus multiple reflection and diffraction might occur inside or on the surface of the cavities, rendering that reflections resemble the diffuse type, in a macroscopic perspective. In such circumstances, employing the diffuse reflection model is more efficient than the specular reflection model. Hence, the radiosity method is employed. The radiosity equations, and hence the radiosity parameters and form factors, are rederived in a style that are suitable for electromagnetic wave application. We then formulate our own model for analysis and derive the path loss expression.