Robust receiver design based on FEC code diversity in pilot-contaminated multi-user massive MIMO systems

摘要

This work investigates robust receiver design against pilot-contaminated channel estimation in large multi-antenna systems. Given bounded channel estimate errors, we tackle the multi-user detection problem by presenting a novel idea of exploiting the forward error correction (FEC) code diversity. Unlike the traditional approach based on worst-case or probabilistic channel error, we distribute different channel codes among pilot-interfering users. We then develop a quadratic-programming receiver to utilize the special FEC signature of target user through a set of linear code constraints. Numerical results demonstrate substantial performance gain over existing robust detectors.