Radio Channel Models

Radio channel models for narrowband and wideband transmissions are commonly used to predict coverage of a wireless link and system performance. In this chapter, the systems channel models are discussed for both narrowband and wideband channels. In a frequency dispersive channel, distortion of narrow pulses and frequency modulated continuous wave (FMCW) or chirp pulses due to phase nonlinearity are outlined to illustrate the effects of deviation from ideal transmission conditions. The various models are first analyzed for time‐invariant conditions followed by time‐variant environments. Small‐scale channel parameters experienced over a few wavelengths or over a short time interval are defined for single input—single output (SISO) systems. Finally, various stochastic and physical channel models that determine the capacity of multiple input‐multiple output (MIMO) systems are outlined.