Chapter 5 of 'Wireless Communications Principles and Practice' discusses mobile radio propagation, focusing on small-scale fading, multipath effects, and their implications for modulation techniques. The chapter covers topics such as Doppler shift, channel sounders, power delay profiles, and various fading mechanisms including Rayleigh and Ricean fading. It also introduces simulation tools like SIRCIM and SMRCIM for indoor and outdoor propagation characteristics.