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In this study, a channel estimator for millimeter wave (mmWave) systems isproposed. By considering the sparse nature of channels in millimeter wave band,the channel estimation problem formulated as an atomic norm minimizationproblem. Previous studies on mmWave channel estimation have focused onfrequency flat channels. However, in this study the work is based on afrequency selective channel and adopted atomic norm minimization and reweighedatomic norm minimization technique for channel estimation in the frequencydomain. Simulation results verify the accuracy of the atomic and reweightedatomic norm minimization techniques.

A Frequency Domain Channel Estimation Based on Atomic Norm Minimization for Frequency Selective MmWave MIMO Systems