Wideband massive MIMO OFDM uplink channel estimation with specific partial-DFT transform

摘要

We propose a new approach to apply the specific partial discrete Fourier transform (SPDFT) technique for channel estimation in wideband massive multiple-input multiple-output (MIMO) systems employing orthogonal frequency division multiplexing (OFDM) to reduce the pilot overhead and to enhance the estimation accuracy. Based on a physically motivated channel model, our approach verify that some parts of the frequency domain information on subcarriers are enough to obtain the nonzero part of channel state information on delay domain during a coherence time period. Then the channel state information on delay-domain are constructed and the whole channel state information on frequency domain are recovered. The simulation results demonstrate the proposed SPDFT scheme can provide a better spectral efficiency or a better estimation accuracy with different strategies of pilot scheduling than the conventional DFT scheme.