On-off division multiple access (ODMA) has emerged as a state-of-the-art unsourced random access (URA) scheme for massive machine-type communications. However, its performance is constrained by equal power allocation, which lacks a natural decoding order for successive interference cancellation, and by the elementary s...
J. Dang, Zai-Chen Zhang, Bin Zhu et al.· International Symposium on W...· 0 citations
Fluid antenna systems obtain spatial degrees of freedom by reconfiguring antenna positions within a confined region, a principle that extends to beamforming: shaped beams can be synthesized using far fewer radio-frequency feeds than candidate antenna positions. When the candidates are densely arranged, however, electro...
Jing-Yuan Xu, Hao-Yu Liang, Zai-Chen Zhang et al.· 0 citations
This paper develops fluid antenna array (FAA)-inspired subarray sizing and transmit-power design for a two-hop amplify-and-forward (AF) unmanned aerial vehicle (UAV) relay using progressively contracting user-location posteriors. A contiguous reconfigurable subarray is shared by first-hop reception and second-hop forwa...
Xuan-Yi Zhu, J. Dang, Chengqiang Zhao et al.· 0 citations
Reconstructing the full-aperture channel of a fluid antenna system (FAS) from a few activated ports requires inferring unobserved responses from limited spatial samples. This paper proposes a covariance-domain FAS channel-reconstruction method based on nonnegative least squares (NNLS). A nonuniform port arrangement con...
A fluid-antenna-assisted distributed joint decoder for cell-free massive MIMO URA and the framework provides a feasible integration of fluid antennas and cell-free URA and motivates end-to-end evaluation under pilot collisions and switching overhead.
The unprecedented growth of machine-type devices has underscored the need for fundamental solutions to support emerging massive connectivity. In particular, unsourced random access (URA) has emerged as a promising paradigm, reframing the massive connectivity problem as a coding-theoretic challenge with favorable energy...
Zhen-Tian Zhang, Mohammad Javad Ahmadi, Kai-Kit Wong et al.· IEEE Transactions on Wireles...· 5 citations
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