Understanding Mobile Radio Propogation-8 — Lesson 8

This lesson covers the concept of mobile radio propagation, focusing on the discrete time impulse response of the wireless mobile fading channel. It discusses the power delay profile and the relationship between bandwidth and received power. The lesson also explores the behavior of wideband and narrowband signals in multipath fading environments. It emphasizes the importance of understanding the channel used and how it treats wideband and narrowband signals differently. The lesson also provides a detailed explanation of the impulse response model of the multipath channel and how it can be used to predict the received signal. It further explains the concept of 'excess delay bins' and how they affect the received signal.

Video Highlights

1:17 - Introduction to mobile radio propagation and the outline of the lecture
3:29 - Explanation of the discrete time impulse response model of a multipath channel
5:30 - Discussion on the relationship between the resolution of the bins and the bandwidth of the signal
15:03 - Explanation of the power delay profile
18:20 - Relationship between bandwidth and the received power
26:56 - Analysis of the received power of wideband signals
34:35 - Examination of the received power of narrowband signals
41:09 - Comparison between the average received power for a CW signal and a wideband signal

Key Takeaways

- The wireless channel is a multipath channel that causes delay spread and fading.
- The impulse response model of the multipath channel can be used to predict the received signal.
- The 'excess delay bins' concept is crucial in understanding how the multipath channel works.
- The same multipath channel treats wideband signals and narrowband signals differently.
- The power delay profile is a crucial factor in understanding the behavior of signals in a multipath channel.
- The bandwidth of the signal has a direct relationship with the received power.