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Early Multiple-Input Multiple-Output with Orthogonal Frequency Division Multiplexing (MIMO-OFDM) channel estimation techniques treat channels as spatially uncorrelated. However, in many situations, MIMO-OFDM channels tend to be spatially correlated, for example, due to limited scattering. For such channels, estimation performance can be improved through exploitation of prior knowledge of the channel spatial correlation, for example, by means of the linear Multiple Mean Square Error (MMSE) technique. This knowledge is, however, not always available. As an alternative, the authors investigate techniques in the angle domain, where the MIMO-OFDM channel model lends itself to a physical interpretation.
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