Dinh, V.-K. ., T.-B. . Chu, M.-T. . Le, and V.-D. . Ngo. “Design of Group Precoding for MU-MIMO Systems With Exponential Spatial Correlation Channel”. EAI Endorsed Transactions on Industrial Networks and Intelligent Systems, vol. 8, no. 26, Jan. 2021, p. e2, doi:10.4108/eai.26-1-2021.168228.