Wireless Communication Networks Explained — Lesson 4

This lesson covers the fundamental aspects of wireless communications. It begins with an introduction to the concept of wireless communication, explaining how it involves transmitting and receiving voice and data using electromagnetic waves in open space. The lesson then delves into the cellular concept, frequency planning, mobile radio propagations, and fading. It also discusses large scale path loss, multipath small scale fading, modulation techniques, channel coding, and multiple access. The lesson concludes with an introduction to wireless networking and wireless communication standards. It uses the example of GSM phones to illustrate various aspects of wireless communications.

Video Highlights

00:21 - Introduction to wireless communications networks and cellular communications.
01:44 - Understanding traffic theory and its impact on quality of service.
03:54 - Explanation of cell radius and reuse factor.
05:06 - Relationship between cell capacity and reuse.
12:15 - Understanding of traffic intensity and load .
14:46 - Discussion on trunking and blocked calls.
39:53 - Understanding of fixed and dynamic channel assignment strategies.
48:33 - Explanation of handoff strategies in cellular networks.

Key Takeaways

- Cell capacity and the reuse factor are interrelated; increasing the value of N (number of cells in a cluster) can reduce interference but also decrease capacity.
- Traffic theory helps determine how many calls can be handled, how many users can be supported, and the likelihood of calls being blocked or delayed.
- Channel assignment strategies, whether fixed or dynamic, significantly impact the performance of a wireless communication system.
- Handoff strategies are crucial in mobile communication to ensure uninterrupted service when a user moves from one cell to another.
- The Erlang B and C formulas are essential tools in estimating the probability of call blocking or delay.