Examensarbeten för masterexamen // Master Theses
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- PostDigital Linearization of a Receiver Optimized for Radar(2022) Laurenius, Rickard; Chalmers tekniska högskola / Institutionen för elektroteknik; Eriksson, ThomasLinearity is an important property of radio frequency amplifiers that has implications for performance in a wide range of applications, from communications to radar. As digital hardware grows ever cheaper and more power efficient, digital techniques for improving the linearity of amplifiers have emerged as an effective replacement for older more power-hungry analogue methods. This thesis seeks to investigate the effectiveness of digital linearization techniques for post-distortion on the receiver side, and in the context of digital radar systems. The investigation has been performed by testing linearization algorithms on recorded signals using hardware typical of modern radio receiver systems. Triangular chirp signals and combined two-tone signals using frequency pairs based on coprime integers are shown to be effective calibration signals. Post-distortion techniques using either memoryless polynomials, memory polynomials or generalized memory polynomials are shown to suppress intermodulation distortion by up to 20dB, and to remain stable for a temperature drift of about 10C. The coefficient estimation algorithm is shown to find inverse models that can improve linearity using only a small number of samples, indicating the possibility of implementations using a low amount of digital resources and model complexities. Ways of compensating for temperature drift have been investigated but to inconclusive results.
- PostMap representation and LIDAR-based vehicle localization(2016) Hägg, Eiliv; Ning, Yingzhi; Chalmers tekniska högskola / Institutionen för signaler och system; Chalmers University of Technology / Department of Signals and Systems
- PostRobotized test setup for autonomous driving - Virtual objects injection(2019) Bodduluri, Preethi; Jagadeepan, Shiva Ajay; Chalmers tekniska högskola / Institutionen för elektroteknik; Chalmers University of Technology / Department of Electrical Engineering
- PostTorque estimation algorithms for stepper motor(2018) Jansson, Julia; Rådahl, Charlotte; Chalmers tekniska högskola / Institutionen för elektroteknik; Chalmers University of Technology / Department of Electrical Engineering