In wireless systems, fading may either be due to multipath propagation, referred to as multipath induced fading, or due to shadowing from obstacles affecting the wave propagation, sometimes referred to as shadow fading.
Fading may either be due to multipath propagation or due to shadowing from obstacles. This is in wireless systems. These obstacles are affecting the wave propagation. The wave propagation is sometimes referred to as shadow fading. Propagation is referred to as multipath induced fading.