MiLAC combiner matches fully digital CRB for DOA estimation of K targets with 2 RF chains per target when row space spans the 2K-dimensional steering-derivative subspace.
Microwave Linear Analog Computer (MiLAC) for Simultaneous Active and Passive Beamforming
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abstract
Microwave linear analog computers (MiLACs) have recently emerged to enable high-performance and efficient beamforming in the analog domain. In this paper, we introduce a dual-functionality framework for MiLAC-aided transceivers. Beyond analog-domain precoding/combining (active beamforming), a MiLAC and its antenna array can simultaneously act as a reconfigurable intelligent surface (RIS) (passive beamforming). This allows the MiLAC to execute beamforming for transmission/reception while reflecting external incident signals. We provide an optimal reconfiguration strategy for this dual-functional MiLAC, and characterize the fundamental limits on the trade-off between active and passive rate, namely the capacity region bounds and the sum-rate capacity.
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cs.IT 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
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How Many RF Chains Does a Microwave Linear Analog Computer (MiLAC) Need to Match the Fully-Digital Cram\'er-Rao Bound?
MiLAC combiner matches fully digital CRB for DOA estimation of K targets with 2 RF chains per target when row space spans the 2K-dimensional steering-derivative subspace.