Measured propagation characteristics of 900 MHz mobile radio channels in mountainous terrain

摘要

900 MHz multipath intensity profiles (impulse response estimates) which may be expected in mountainous terrain are described. Using standard propagation models, it is shown that excess delays greater than 100 mu s may be encountered in scenarios with a line-of-sight path to large scatterers and an obstructed direct path. Possible scenarios in which large excess delays may occur are presented, and two models are proposed. These models are used to predict the channel impulse response that may be expected. Calculated results are presented, and a comparison with measured results in the literature is given. The measurement equipment is briefly described. Such long excess delays are consistent with measured results.