The aim of this thesis is to study different digital communication protocols used in wired and wireless communications and the use of modeling, calibration and compensation to increase the performance of the system.
The system under study is the NI USRP, a user programmable software defined radio (SDR) of National Instruments (NI). Its hardware contains IQ modulators and demodulators to convert the signals from the high speed ADCs and DACs to the GHz range. Furthermore, the digital signals can be processed directly using an FPGA-based DSP system that can be programmed through the LabView runtime environment of NI.
The first step will be to study different wireless protocols and to implement them in the NI USRP environment. Starting from simple PSK and QAM modulation, the target is to finally develop a complete OFDM-based system similar to a WiFi protocol.
The compensation of non-idealities, such as the channel characteristics, non-linear distortions in the electronics, frequency and timing deviations ..., is crucial for the high performance of modern communication. These modeling and calibration techniques will be studied and implemented using the NI USRP system.
What will you have learned?
- Expertise in a lot of different telecommunication protocols
- Hardware and software experience for measurement and compensation on non-idealities, including linear and nonlinear distortions, time jitter and phase noise, …
- Possibility to design and make your own hardware setups to demonstrate particular communication problems (e.g multipath, interference, fading, …)