Communication Laboratory, Samsung Advanced Institute of Technology, Samsung Electronics, Yongin-Si, South Korea;Department of Information and Communication Technologies, Universitat Pompeu Fabra, Barcelona, Spain;ST-NXPWireless - SW/FW/Algorithm Group, European Telecommunications Standard Institute, Sophia Antipolis Cedex, France;Wireless R&D Laboratory, Huawei Technologies, Plano, TX;Broadband Wireless and Sensor Networks, Athens Information Technology, Athens, Greece