1. School of Electronic and Information Engineering, Beihang University, Beijing, China
2. Huawei Technologies Company Ltd., Shenzhen, China
3. Huawei Device Company Ltd., Shenzhen, China
4. University of Michigan–Shanghai Jiao Tong University (UM-SJTU) Joint Institute, Shanghai Jiao Tong University, Shanghai, China
5. Department of Electronic Engineering, Beijing National Research Center for Information Science and Technology, Tsinghua University, Beijing, China
6. Wireless Communications Systems Group (WCSG), Aristotle University of Thessaloniki, Thessaloniki, Greece