Millimeter Wave Analog Beamforming Codebooks Robust to Self-Interference
Ian P. Roberts, Hardik B. Jain, Sriram Vishwanath, and Jeffrey G., Andrews

TL;DR
This paper introduces a new methodology for designing analog beamforming codebooks in mmWave full-duplex systems that reduces self-interference while maintaining high beamforming gain, enabling more robust and efficient communication.
Contribution
It presents the first codebook design specifically aimed at minimizing self-interference in mmWave full-duplex systems, with an algorithm that accounts for hardware non-convexities.
Findings
Achieves 20-50 dB increased robustness to self-interference.
Outperforms or matches existing codebooks in spectral efficiency.
Supports beam alignment with reduced self-interference.
Abstract
This paper develops a novel methodology for designing analog beamforming codebooks for full-duplex millimeter wave (mmWave) transceivers, the first such codebooks to the best of our knowledge. Our design reduces the self-interference coupled by transmit-receive beam pairs and simultaneously delivers high beamforming gain over desired coverage regions, allowing mmWave full-duplex systems to support beam alignment while minimizing self-interference. To do so, our methodology allows some variability in beamforming gain to strategically shape beams that reject self-interference while still having substantial gain. We present an algorithm for approximately solving our codebook design problem while accounting for the non-convexity posed by digitally-controlled phase shifters and attenuators. Numerical results suggest that our design can outperform or nearly match existing codebooks in sum…
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