Hybrid Beamforming — Lesson 5

This lesson covers the concept of increasing the number of antennas to large numbers, also known as Massive MIMO (Multiple Input Multiple Output). It discusses the benefits and challenges of implementing Massive MIMO, including the increase in capacity, the reduction in channel variability, and the complexity of signal processing. The lesson also explores the potential of millimeter wave bands for enabling Massive MIMO, given their smaller wavelength and antenna dimensions. It further delves into the concept of hybrid beamforming, which combines analog and digital beamforming, and the proposal of lens MIMO, which resolves different paths based on the physical mechanism of the antenna design.

Video Highlights

00:18 - Capacity of Hw channels for large M
08:33 - Aspects of millimeter wave band
12:17 - Power angular spectrum and K factor
15:49 - Impact of directional antennas on the K factor
18:26 - Spatial correlation in 3GPP MIMO systems
27:36 - Challenges with massive MIMO and beam forming
32:58 - Beamspace MIMO using LENS antenna array

Key Takeaways

- Massive MIMO increases capacity and reduces channel variability, but it also increases signal processing complexity.
- Millimeter wave bands can potentially enable Massive MIMO due to their smaller wavelength and antenna dimensions.
- Hybrid beamforming, which combines analog and digital beamforming, is a potential solution for implementing Massive MIMO.
- Lens MIMO, which resolves different paths based on the physical mechanism of the antenna design, is another proposed solution.