Massive MIMO is a promising technology and a strong candidate for future-generation wireless systems. This paper describes some aspects of realistic algorithm design of a 128-antenna prototype, including low-complexity algorithms and feasible designs such as equivalent channel acquisition at the BS by SRS, SINR estimation at the BS, CQI estimation at the UE, DMRS design and IRC receiver implementation, etc. Finally, the link-level simulation shows the effectiveness and benefits of the proposed algorithms and designs.