This paper proposes a new channel estimation scheme for the multiuser massivemultiple-input multiple-output (MIMO) systems in time-varying environment. Weintroduce a discrete Fourier transform (DFT) aided spatial-temporal basisexpansion model (ST-BEM) to reduce the effective dimensions of uplink/downlinkchannels, such that training overhead and feedback cost could be greatlydecreased. The newly proposed ST-BEM is suitable for both time division duplex(TDD) systems and frequency division duplex (FDD) systems thanks to the anglereciprocity, and can be efficiently deployed by fast Fourier transform (FFT).Various numerical results have corroborated the proposed studies.
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