1. Corporate Research and Development; Qualcomm Technologies Inc.; 5775 Morehouse Drive San Diego CA 92121 USA
2. Mathematical and Algorithmic Sciences Lab; France Research Center Huawei Technologies Co., Ltd.; 20 Quai du Point du Jour Boulogne-Billancourt 92100 France
3. Signal Theory and Communications Department; Universidade de Vigo, EE Telecomunicacion, Campus Universitario; Vigo 36310 Spain