Practical Null Steering in Millimeter Wave Networks
summary
Nulli‑Fi creates directional nulls on commercial 60 GHz, 16‑element phased arrays (IEEE 802.11ad) using a provably optimal phase‑pair algorithm plus a discrete optimization that models hardware imperfections. It finds an interferer’s direction in under 300 ns with a fast null steering protocol, achieves up to 18 dB interference suppression even with 4‑bit phase control, and in a 10‑link testbed yields about 2.68× higher total throughput by enabling concurrent links.
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chapters (13)
- 0:00Intro
- 0:30Millimeter Wave High Frequency 24 GHz, Huge Bandwidth
- 0:57Millimeter Wave Networks
- 2:12Creating Nulls in Practice is Challenging
- 4:54How to control the beam pattern?
- 5:36Representing Signals as Vectors
- 6:12Nulli-Fi's Algorithm
- 6:53Nulling Example
- 9:10Transmitter Fast Null Steering Protocol
- 10:42Qualitative Results
- 11:12Restoring SINR using Nulli-Fi
- 12:00Throughput Gains
- 12:29Conclusion
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