Capacity limits of dense palm-sized MIMO arrays

We address the capacity limits of size-constrained multi-input multi-output (MIMO) arrays. While most work on MIMO focuses on arrays with of a small number of sufficiently spaced, low correlated antenna elements, we look at the case where a fixed small space is being filled up with antenna elements. We obtain a dense MIMO system whose rate performance is analyzed. We establish capacity limits and an equivalence with the capacity of MIMO arrays with unlimited aperture.