Spatial Interpolated Lookup Tables (LUTs) Models for Ergodic Capacity of MIMO FSO Systems

We propose low complexity, adaptive multivariate precomputed B-spline and Barycentric Lagrange interpolation-based lookup table (B
²
LUT) models for the estimation of channel capacity of multiple-input-multiple-output free-space optical communication systems over generalized Málaga (M)-distributed atmospheric turbulence channels. The models require low memory for efficient operation and exploit precomputed weights to achieve fast and stable operation. The models can significantly reduce the size of lookup table, thereby reducing the computational cost. Similarly, the models can enhance the speed by up to 15 orders of magnitude and beyond without loss of fidelity compared with the current analytical models.