Predistortion Techniques — Lesson 3

This lesson covers the concept of pre-distortion techniques in software-defined radios. It delves into the intricacies of power amplifier nonlinearity and the linearization techniques used to counteract its negative effects. The lesson further explores the elements of feed-forward and feedback techniques, and how they are incorporated into pre-distortion techniques. It also discusses the application of these techniques in real-life scenarios, such as in the use of signal generators and spectrum analyzers. The lesson concludes with an introduction to different models used in pre-distortion techniques.

Video Highlights

00:26 - Concept of predistortion based linearization technique
10:10 - Example of characteristics test-bed setup
14:33 - Vector spectrum analyzer
17:26 - Time delay correction
20:11 - PA modelling and DPD modelling
25:07 - Various digital models

Key Takeaways

- Pre-distortion techniques are used to counteract the negative effects of power amplifier nonlinearity in software-defined radios.
- These techniques incorporate elements of feed-forward and feedback techniques.
- Pre-distortion techniques involve placing an element before the power amplifier to correct bandwidth and reduce component usage.
- Different models, such as the Wiener model or the Hammerstein model, can be used for pre-distortion or inverse modeling.
- Practical application of these techniques involves the use of signal generators and spectrum analyzers.