A Robust Matched Filter for Massive MIMO Systems

We present a novel approach for low-complexity receive filter design well-suited for cellular massive MIMO systems. Our robust matched filter design allows to exploit the channel structure in terms of covariance matrices to improve the performance in the face of pilot-contamination, while basically keeping the complexity of a matched filter. The proposed design generalizes several previous approaches to filter design for massive MIMO. We show by asymptotic analysis that with the proposed filter design the achievable rate grows without bound for growing numbers of antennas even in the presence of pilotcontamination. We demonstrate with numerical results that the proposed design is competitive with more complex approaches in a practical cellular setup.