Xiaojie Wang 0002 Chulong Liang Li Ping 0001 Stephan ten Brink Achievable Rate Region for Iterative Multi-User Detection via Low-cost Gaussian Approximation. 455-459 2019 ISIT https://doi.org/10.1109/ISIT.2019.8849621 conf/isit/2019 db/conf/isit/isit2019.html#WangLPB19