Research on Massive MIMO Based on Complete Complementary Sequence Precoding

Massive MIMO has become one of the core technologies of 5G mobile communication systems. In this paper, fully complementary sequence precoding is designed to reduce the equivalent channel dimension, thereby greatly reducing the pilot overhead. In the beginning, three design criteria are proposed. Based on the design criteria, this paper uses Gray's complementary sequences to design the precoding matrix and finally optimize it into an omnidirectional precoding matrix with better performance.