Ergodic Capacity Analysis of MISO/SIMO-OFDM With Arbitrary Antenna and Channel Tap Correlation

We analyze the ergodic capacity of multiple-input–single-output/single-input–multiple-output orthogonal frequency-division multiplexing (MISO/SIMO-OFDM) systems with arbitrary antenna and channel tap correlations. Existing works in literature consider the Kronecker model of antenna and channel tap correlations for capacity analysis. However, the applicability of such a model does not hold for all practical scenarios. Here, we assume a generalized correlation model, and the Kronecker model is a special case of our model. We analyze additional conditions beyond that needed by the Kronecker model to maximize capacity and conditions that reduce capacity and derive a closed-form capacity expression. Our results are validated using Monte Carlo simulations.