1. Instituto de Telecomunicações, Department of Electronics, Telecommunications, and Informatics, Universidade de Aveiro, Aveiro, Portugal
2. Signal Theory and Communications Department, Universitat Politecnica de Catalunya, Barcelona, Spain
3. Huawei Technologies Sweden AB, Stockholm Research Centre, Kista, Sweden
4. Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd, U.K.
5. IS-Wireless, Piaseczno, Poland
6. Dipartimento di Elettronica e Telecomunicazioni (DET), Politecnico di Torino, Turin, Italy