1. International Graduate School on Mobile Communications (MobicoM), Ilmenau University of Technology, Helmholtzplatz 2, 98684 Ilmenau, Germany
2. Fraunhofer Institute for Integrated Circuits IIS, 91058 Erlangen, Germany
3. Institute of Information Technology, Ilmenau University of Technology, Helmholtzplatz 2, 98684 Ilmenau, Germany