Understanding Mobile Radio Propogation-6 — Lesson 6

This lesson covers the concept of mobile radio propagation, focusing on small scale fading. It delves into the causes of fading and the integral role of multipath in mobile communication systems. The lesson also explores the effects of multipath fading, Doppler shift, delay spread, and how inter symbol interference is caused due to multipath. It further discusses the factors influencing small scale fading, such as the presence of reflecting objects and scatterers, the speed of the mobile, and the transmission bandwidth of the signal. The lesson concludes with an examination of the Doppler Effect and delay spread in the context of a mobile scenario.

Video Highlights

00:24 - Introduction to the lecture on mobile radio propagation and small scale fading
03:14 - Explanation of outage probability and coverage area in mobile communication
09:47 - Explanation of the concept of delay spread and its impact on signal reception
16:44 - Discussion on the factors influencing small scale fading, including multipath propagation, speed of the mobile, and transmission bandwidth of the signal
31:10 - Explanation of the Doppler Effect in a mobile scenario
40:19 - Discussion on the impact of delay spread on signal reception and inter symbol interference
53:30 - Conclusion of the lecture with a summary of the topics covered

Key Takeaways

- Small scale fading is a crucial aspect of mobile radio propagation, caused by the destructive interference of two or more versions of the transmitted cell signal arriving at the receiver at slightly different times.
- Multipath is an integral part of most mobile communication systems, causing rapid fluctuations of signal amplitude known as small scale fading.
- Doppler shift occurs in a mobile scenario where the mobile changes its location with respect to the base station, causing a shift in frequency.
- Delay spread, a direct consequence of multipath propagation, leads to an increase in the signal bandwidth and can cause inter symbol interference.
- Factors such as the presence of reflecting objects and scatterers, the speed of the mobile, and the transmission bandwidth of the signal significantly influence small scale fading.