Waveforms Beyond 5G - Part IV — Lesson 4

This lesson covers the structures of FBMC and UFMC, and the generalized frequency division multiplexing. The lesson also discusses the initial DFT block and group of subcarriers in UFMC, the notations carried forward, and the number of resource blocks to be used. It further explains the output in UFMC, the concept of filtering, and the IDFT operation. The lesson also touches on the complexity and performance of UFMC, and the concept of Gabor theory in understanding the system. Lastly, it explores the generalized frequency division multiplexing architecture and its advantages and disadvantages.

Video Highlights

00:19 - Introduction and recap of previous lesson
04:43 - Generalized frequency division multiplexing and its structure
06:04 - Gabor theory and Gabor expansion
13:20 - Balian-Low theorem
18:02 - Explanation of generalized frequency division multiplexing
25:02 - GFDM matrix

Key Takeaways

- The evolution of air interface towards 5G involves exploring various waveforms like FBMC, UFMC, and GFDM.
- UFMC is a compromise between FBMC and OFDM, offering filtering operation and lower complexity.
- The Gabor theory allows a function to be expanded into a series of elementary functions, aiding in understanding the system.
- GFDM offers flexibility in terms of time and frequency resources and is resilient to synchronization requirements. However, it has high complexity and out of band leakage.
- The Balian-Low theorem states that a signal cannot be well contained in time and frequency if the product of time and frequency shift equals to 1.