A study of rain attenuation and interference effects on cell planning for LMDS system

In our study of radio propagation characteristics at Ka and Ku band, we first deal with planning aspects for LMDS. In a fixed radio access system, cell planning aims to use as much as possible of the channel bandwidth in each sector to maximize link capacity. To minimize interference, frequency decoupling, polarization decoupling and space decoupling methods are used here. In analyzing the inter-cell interference, we simultaneously consider four types of interference, in which the hubs use the same frequency band and polarization as the terminal station, including interference of front-to-front, front-to-back, back-to-back, and back-to-front antennas. We also discuss the S/(I+N) ratio for subscribers located at the boundary of the cell.