Abstract: Sparse linear arrays (SLAs) are becoming increasingly popular due to their superior performance in achieving higher degrees of freedom (DOFs) compared to uniform linear arrays. However, most ...
Abstract: The rotating phase of orbital angular momentum (OAM) waves can bring new degrees of freedom in the wireless communication and microwave imaging realms, and more generally for inverse ...
This paper surveys econometric innovations related to differences-in-differences estimators and to event-study models with time-varying treatment effects. Our discussion highlights tricky ...
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