This lesson covers the basics of software-defined radio techniques and practical applications, focusing on the linearization techniques of power amplifiers. It discusses different models such as the Saleh model, Rapp model, and Ghorbani model, and how they can be implemented in MATLAB or other tools. The lesson also delves into the details of linearization techniques to remove the unwanted effect of power amplifier non-linearity. It explains three types of techniques found in literature: feed forward technique, feedback technique, and pre-distortion technique. The lesson also discusses the pros and cons of each technique, providing a comprehensive understanding of power amplifier linearization techniques.
00:18 - Feed forward technique
04:43 - Adjacent channel spectrum leakage and signal distortion
08:22 - Coupler drop and gain
15:08 - Aim of the second path
21:48 - Limitations of using components
25:36 - Feedback technique
- Software defined radio techniques are crucial in understanding and mitigating the impact of power amplifier non-linearity on signal quality..
- Linearization techniques such as feed forward, feedback, and pre-distortion are used to mitigate the unwanted effects of power amplifier non-linearity.
- The feed forward technique uses two power amplifiers to linearize one amplifier, making it a complex and costly solution.
- The feedback technique uses a feedback circuit for error correction, providing a more portable and less costly solution.
- The pre-distortion technique combines the feed forward and feedback techniques, offering a compromise between the two.