Waveforms Beyond 5G - Part III — Lesson 3

This lesson covers the concept of OFDM with offset QAM, the conditions for channel transmission signalling rate, and the role of frequency displacement. It further delves into the universal filtered multi-carrier structure, a compromise between OFDM and FBMC, and its advantages and disadvantages. For instance, the lesson explains how UFMC reduces complexity and improves out-of-band performance compared to OFDM.

Video Highlights

00:18 - Introduction
01:52 - OFDM with offset QAM
07:30 - Effect of carrier phase offset and effect of delay distortion
11:34 - Universal filtered multi-carrier
17:39 - Output of the receiver for UFMC
26:29 - Spectrum comparison of OFDM and UFMC

Key Takeaways

- Waveforms that go beyond 5G are expected to be in the next generation standards.
- Designing filters for sub-carriers requires specific conditions to be met.
- OFDM with offset QAM is a method of transmitting digital data at speeds very close to the Nyquist data rate of band-limited channels without using sharp cut-off filters.
- Universal filtered multi-carrier (UFMC) structure is a compromise between OFDM and FBMC, reducing complexity and improving out-of-band performance compared to OFDM.
- The complexity of UFMC is not very high as compared to OFDM and the performance is going closer towards FBMC.