Mr. Anouar Jerbi from the Mathematical and Electrical Engineering department (MEE) and the Lab-STICC laboratory, will present his research about :
"Non-Coherent Detection of Continuous Phase Modulation for Low Earth Orbit Satellite IoT Communications Affected by Doppler Shift"
The Internet of Things (IoT) is a concept in which many objects are equipped with transmission or communication capabilities via an Internet network connection. The IoT market continues to grow in recent years. In this context, IoT applications can also concern satellite operators, especially in poorly covered areas, and thus open up interesting issues in terms of the physical layer of these communicating objects. Continuous phase modulations (CPM) make it possible to meet certain challenges of this application, including for instance the use of nonlinear amplifiers thanks to their constant envelope. Their continuous phase also gives them interesting spectral properties.
In this context, we are mainly interested in this thesis in the reception of CPM signals in the presence of the Doppler effect, a problem characteristic of satellite links in low orbit. We start by presenting two detectors that are robust against different Doppler shift orders based on the non-coherent reception criterion as well as the per survivor processing (PSP) technique which allow detection in presence of Doppler in a blind way. Then, in order to further reduce the complexity, we present our multiple symbol differential detector and we give a method to optimize the delay used which leads to a performance improvement and we show that it can withstand certain order of the Doppler effect through performance simulations.
Thesis acreditation from IMT Atlantique with the Doctoral School SPIN
Keywords: Continuous Phase Modulation, Doppler effect , Internet of Things, Satellite communications, Non-coherent sequence detection, Differential detection