Two Main Types of Fading in Mobile Communication Systems

In mobile communication systems, fading is primarily categorized into two types: large-scale fading and small-scale fading. Large-scale fading refers to the reduction in average signal energy or path loss caused by movement over extensive areas. Small-scale fading encompasses two mechanisms: signal delay spread and time-varying channel characteristics. In wireless applications, time-varying channel properties occur due to changes in transmission paths resulting from relative movement between transmitters and receivers. The rate of change in these propagation conditions directly influences the fading rate. When numerous reflective paths exist without a direct line-of-signal component, this small-scale fading is called Rayleigh fading, where the amplitude of the received signal is statistically described by the Rayleigh probability distribution function. This experiment will investigate this fading phenomenon through MATLAB-based simulations implementing Rayleigh channel models using functions like rayleighchan() for modeling multipath propagation and berfading() for analyzing bit error rate performance under fading conditions.