Movable antennas improve secret key generation rates in correlated channels
Original title: Movable Antenna-Assisted Secret Key Generation over Temporally Correlated Channels
Position optimization alone yields 51% rate gains at high correlation, with joint optimization adding another 106%.
The paper studies physical-layer key generation using movable antennas over temporally correlated channels. A Gauss-Markov model characterizes multipath gains. Mutual information is characterized and a nonconvex optimization problem is solved for antenna positions and beamforming under power and spacing constraints. Simulations demonstrate substantial rate improvements over fixed-position baselines.
- First-order Gauss-Markov process models temporal correlation
- Finite-horizon MI approximation error bound vanishes with rising SNR
- Alternating optimization combines exact beamforming with SCA position updates
- 51% rate increase from position optimization alone
- 106% further gain from joint position and beamforming optimization
From the original article
1 min read at arxiv.orgPhysical-layer key generation (PLKG) exploits reciprocal channel dynamics to generate symmetric keys, addressing the key distribution problem in wireless communications. However, strong temporal correlation in slow-fading environments limits fresh randomness and results in low key generation rates.
By Zhiyu Huang · arxiv.org
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.