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A method for channel estimation in wideband massive Multiple-InputMultiple-Output (MIMO) systems using covariance identification is developed.The method is useful for Frequency-Division Duplex (FDD) at either sub-6GHz ormillimeter wave (mmWave) frequency bands and takes into account the beam squinteffect caused by the large bandwidth of the signals. The method relies on theslow time variation of the channel covariance matrix and allows for theutilization of very short training sequences thanks to the exploitation of thechannel structure, both in the covariance matrix identification and the channelestimation stages. As a consequence of significantly reducing the trainingoverhead, the proposed channel estimator has a computational complexity lowerthan other existing approaches.

FDD Channel Estimation via Covariance Identification in Wideband Massive MIMO Systems