Prediction of multipath delay profiles in mountainous terrain

摘要

Measurements of the complex impulse response of 900 MHz radionchannels in mountainous terrain in British Columbia, Canada, are used tonquantify values for the normalized scattering cross sectionnΣ0 for mountains covered with evergreen trees. Thenbistatic radar equation is then used in a propagation model to predictncharacteristics of the impulse response in similar terrain fromntopographical data. Three-dimensional (3-D) propagation models fornmountainous areas are important, because such areas stress to the limitnthe multipath handling capabilities of most air interfaces.nΣ0 is related to a more fundamental characteristicnΓ of the surface via Lambert's law. The measured value of Γnis -21.1 ±2.9 dB, which is similar to some of the very few othernvalues found in the literature. Using this value of Γ, thenpredicted multipath delay profiles correspond well with measurements.nThe results can be used to predict complex impulse responses innmountainous terrain which may be convolved with a simulated data streamnto predict error rate, outage or other aspects of wireless systemnperformance