Non-Linearity - Part III — Lesson 3

This lesson introduces the term 'noise power ratio' used for multiple carriers and explains its significance. It further discusses the impact of non-linearity on the system's linearity and introduces terms like 'passive intermodulation product'. It also covers the effects of non-linearity on spectrum spreading and adjacent channel interference. The lesson concludes with a discussion on the mitigation of non-linearity through pre-distortion and equalization.

Video Highlights

00:20 - Noise power ratio for multiple carriers
04:33 - Introduction to passive intermodulation product
06:04 - Linear range of operation and spurious free dynamic range
15:20 - Example problem
20:33 - AM to AM conversion and AM to PM conversion
22:25 - Effects of non-linearity on spectrum spreading and adjacent channel interference
24:47 - Constellation diagram
27:06 - Constellation tilt due to interaction and its effect on BER
27:45 - Mitigation of non-linearity through predistortion and equalization

Key Takeaways

- Non-linearity in devices can generate intermodulation products, affecting the operation of these devices.
- Manufacturers define intermodulation products in terms of third order intermodulation.
- The term 'noise power ratio' is used for multiple carriers and is defined as noise power density outside desired bandwidth divided by noise power density within desired bandwidth.
- Non-linearity can affect the system's linearity, with higher noise power ratio indicating better linearity.
- Passive intermodulation product is a term used to describe intermodulation generated due to metal to metal contact.
- Mitigation of non-linearity can be achieved through pre-distortion and equalization.