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In this letter, we investigate time-domain channel estimation for widebandmillimeter wave (mmWave) MIMO OFDM system. By transmitting frequency-domainpilot symbols as well as different beamforming vectors, we observe that thetime-domain mmWave MIMO channels exhibit channel delay sparsity and especiallyblock sparsity among different spatial directions. Then we propose atime-domain channel estimation exploiting block sparsity (TDCEBS) scheme, whichalways aims at finding the best nonzero block achieving the largest projectionof the residue at each iterations. In particular, we evaluate the systemperformance using the QuaDRiGa which is recommended by 5G New Radio to generatewideband mmWave MIMO channels. The effectiveness of the proposed TDCEBS schemeis verified by the simulation results, as the proposed scheme outperforms theexisting schemes.

Channel Estimation for Wideband MmWave MIMO OFDM System Exploiting Block Sparsity