Non-Linearity - Part I — Lesson 1

This lesson covers the concept of non-linearity in communication systems, particularly in wireless communication. It delves into the issues faced in long-distance wireless communication due to high error probability and delay. The lesson explains the role of power amplifiers in transmitting large power from satellites to the ground and vice versa. It also discusses the non-linear characteristics of practical devices and how they affect the communication system. The lesson further explores the impact of non-linearity on cascaded systems and mitigation techniques. For instance, the lesson uses the example of a non-linear device receiving voltage input and producing voltage output to illustrate the concept of non-linearity.

Video Highlights

00:20 - Introduction and outline
03:54 - Generalized form of non-linear expression and Taylor series
07:11 - concept of gain compression as a major effect of non-linearity
12:21 - Characteristics graph in terms of power
14:54 - What happens with a single carrier input to a non-linear device
20:54 - Output spectrum of w1 and w2

Key Takeaways

- Non-linearity in communication systems can lead to high error probability and delay in long-distance wireless communication.
- Power amplifiers play a crucial role in transmitting large power from satellites to the ground and vice versa.
- Non-linear characteristics are common in practical devices and can significantly impact the communication system.
- Non-linearity can affect cascaded systems, where devices are put one after another.
- Mitigation techniques can help manage the effects of non-linearity.