Multipath channel characteristics using spectral analysis of the signal power density

This paper introduces a concept to quantify the indirect signals in a multipath environment. By definition multipath occurs when a wave propagates to a point in space via different paths. The multipath is caused by reflection of the direct wave off objects such as buildings, towers, hills, and vehicles. A technique was developed in which the power density from a mobile receiver is recorded over time. By examination of the Fourier transform of the power density the number of indirect fields can be calculated as well as the reflection coefficient for each indirect field. The theory for this technique is developed and the limitations of the technique are noted. A few specific case studies were examined using the theory developed in this technique.