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The rapid development of wireless communication in today's society is facing the development bottleneck of increasingly tense spectrum resources. As the key technology of 5G technology, Massive Multiple Input Multiple Output (MMIMO) technology has been widely studied and applied in recent years. It is expected to bring progress to wireless communication systems. The key characteristic of MMIMO is its large antenna array that results in a high dimension of the wireless system channel. This article examines the use of precoding technology in large-scale multi-antenna MIMO systems to address the issue of Common Channel Interference (CCI). The study starts by introducing the concept of linear digital precoding and provides mathematical demonstrations of three linear digital precoding schemes. The performance of these schemes is then simulated and analyzed using MATLAB, with the results showing a significant improvement in the bit error performance and combining rate of the MIMO system. [ABSTRACT FROM AUTHOR]