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Array Geometry-Invariant Space-Time Opportunistic Null-Space Communications
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DOI：10.1109/ACCESS.2024.3395168.png)
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Abstract
En 中文
This work studies the impact of the array geometry on a space-time extension of a generalized class of null-space precoding format denoted as pi -waveforms (Projection-Invariant waveforms), which exhibit subspace invariance and robustness to subspace leakage in the single-antenna case. In feedforward opportunistic communications, subspace leakage decreases the interference mitigation capability and the energy efficiency of conventional null-space precoding schemes. These effects are more notorious in multi-antenna scenarios, where miscalibrated sensors alter the array geometry. The study, which is carried out at both time-frequency non-asymptotic and asymptotic regimes, concludes that pi -waveforms are independent of the array geometry, allowing their use in general unstructured or uncalibrated arrays. The array-geometry invariance is fundamental to enabling calibration-less coherent opportunistic communication.
Keywords:
Null space
Antenna arrays
Interference
Geometry
Time-frequency analysis
Precoding
Wireless communication
Feedforward systems
Opportunistic communications
null-space precoding
interference mitigation
feedforward communications
multi-antenna
opportunistic interference alignment
array-geometry uncertainties
cognitive interference management