Low-Cost Superimposed Pilots Based Receiver for Massive MIMO in Multicarrier System

In this paper, we present a low-cost receive algorithm for massive Multiple-Input Multiple-Output (MIMO) system, which exploits 2-dimensional superimposed pilots in time and frequency domain. By introducing the well designed superimposed pilots, the pilot contamination can be systematically suppressed. Even within a small time-frequency allocation, transforming the 2-dimensional superimposed pilots to an equivalent one-dimensional orthogonal pattern, the provided processing gain can be adequate to achieve precise channel estimation on the basis of linear operations. In this paper, we provide the proof-of-concept with link layer simulation for multicarrier system. Additionally, the 2-dimensional trellis-based channel estimation, as a high-cost solution, will be compared to the proposed solution, in order to quantify the reasonability of the trade-off.