Millimeter-wave Communication and Radar Sensing — Opportunities, Challenges, and Solutions
Doctoral thesis, 2021
High data rate millimeter-wave transmission experiments have been demonstrated with the help of advanced instrumentations. These demonstrations show the potential of transceiver chipsets. On the other hand, the real-time communication demonstrations are limited to either low modulation order signals or low symbol rate transmissions. The reason for that is the lack of commercially available high-speed analog-to-digital converters (ADCs); therefore, conventional digital synchronization methods are difficult to implement in real-time systems at very high data rates. In this thesis, two synchronous baseband receivers are proposed with carrier recovery subsystems which only require low-speed ADCs [A][B].
Besides synchronization, high-frequency signal generation is also a challenge in millimeter-wave communications. The frequency divider is a critical component of a millimeter-wave frequency synthesizer. Having both wide locking range and high working frequencies is a challenge. In this thesis, a tunable delay gated ring oscillator topology is proposed for dual-mode operation and bandwidth extension [C].
Millimeter-wave radar offers advantages for high accuracy sensing. Traditional millimeter-wave radar with frequency-modulated continuous-wave (FMCW), or continuous-wave (CW), all have their disadvantages. Typically, the FMCW radar cannot share the spectrum with other FMCW radars. With limited bandwidth, the number of FMCW radars that could coexist in the same area is limited. CW radars have a limited ambiguous distance of a wavelength. In this thesis, a phase-modulated radar with micrometer accuracy is presented [D]. It is applicable in a multi-radar scenario without occupying more bandwidth, and its ambiguous distance is also much larger than the CW radar. Orthogonal frequency-division multiplexing (OFDM) radar has similar properties. However, its traditional fast calculation method, fast Fourier transform (FFT), limits its measurement accuracy. In this thesis, an accuracy enhancement technique is introduced to increase the measurement accuracy up to the micrometer level [E].
high data rate
fast Fourier transformation (FFT).
Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics
A Synchronous Baseband Receiver for High-Data-Rate Millimeter-Wave Communication Systems
IEEE Microwave and Wireless Components Letters,; Vol. 29(2019)p. 412-414
Coded Pilot Assisted Baseband Receiver for High Data Rate Millimeter-Wave Communications
IEEE Transactions on Microwave Theory and Techniques,; Vol. 68(2020)p. 4719-4727
A D-band Dual-Mode Dynamic Frequency Divider in 130nm SiGe Technology
IEEE Microwave and Wireless Components Letters,; Vol. 30(2020)p. 1169-1172
Micrometer Accuracy Phase Modulated Radar for Distance Measurement and Monitoring
IEEE Sensors Journal,; Vol. 20(2020)p. 2919-2927
OFDM Radar Range Accuracy Enhancement Using Fractional Fourier Transformation and Phase Analysis Techniques
IEEE Sensors Journal,; Vol. 20(2020)p. 1011-1018
Electrical Engineering, Electronic Engineering, Information Engineering
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 4946
To be admitted, please enter the numbers: 464754 for zoom meeting
Opponent: Prof. Izzat Darwazeh, University College London, England