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We propose a MIMO channel estimation method for millimeter-wave (mmWave) andterahertz (THz) systems based on frequency-selective atomic norm minimization(FS-ANM). For the strong line-of-sight property of the channel in suchhigh-frequency bands, prior knowledge on the ranges of angles ofdeparture/arrival (AoD/AoA) can be obtained as the prior knowledge, which canbe exploited by the proposed channel estimator to improve the estimationaccuracy. Simulation results show that the proposed method can achieveconsiderable performance gain when compared with the existing approacheswithout incorporating the the strong line-of-sight property.

mmWave/THz Channel Estimation Using Frequency-Selective Atomic Norm Minimization