Robust massive MIMO Equilization for mmWave systems with low resolution ADCs

摘要

Leveraging the available millimeter wave spectrum will be important for 5G.In this work, we investigate the performance of digital beamforming with lowresolution ADCs based on link level simulations including channel estimation,MIMO equalization and channel decoding. We consider the recently agreed 3GPP NRtype 1 OFDM reference signals. The comparison shows sequential DCD outperformsMMSE-based MIMO equalization both in terms of detection performance andcomplexity. We also show that the DCD based algorithm is more robust to channelestimation errors. In contrast to the common believe we also show that thecomplexity of MMSE equalization for a massive MIMO system is not dominated bythe matrix inversion but by the computation of the Gram matrix.