Inthispaper,channelestimationinmillimeterwave(mmWave)communicationsystemsisconsidered.IncontrasttoprevailingmmWavechannelestimationmethodsexploitingthesparsitynatureofthechannel,wemoveonestepfurtherbyexploitingthejointAoD-AoAangularspread.Byformulatingthechannelestimationasablock-sparse