Kalendarium
Thesis defence: Frequency Generation and Baseband Filters for mm-Wave 5G and 6G Transceivers
Disputation
From:
2024-05-30 09:15
to
13:00
Place: E-house, E:1406.
Contact: rikard [dot] gannedahl [at] eit [dot] lth [dot] se
Rikard Gannedahl defends his thesis: Frequency Generation and Baseband Filters for mm-Wave 5G and 6G Transceivers.
In order to keep up with the constant demand for higher data rates, the fifth generation of mobile communication (5G) introduced the use of mm-wave carrier frequencies from 24 to 71 GHz. Plenty of new frequency spectrum then became available, which has allowed for channel bandwidths of several hundreds of MHz. 6G is projected to continue this trend with even higher carrier frequencies and wider bandwidths, reaching carrier frequencies above 100 GHz and bandwidths in the multi-GHz range. However, this creates new challenges for circuit designers, as the performance of radio circuits typically degrades with increasing frequency. Two critical components in radio transceivers whose performance are highly affected by the increase in carrier frequency and bandwidth are frequency generators and baseband filters. The former generates a local oscillator (LO) signal required for frequency translating the data signal to/from the baseband from/to the carrier frequency, and the latter is used to separate the desired signal from undesired interference and noise in a receiver and to prevent leakage of undesired spectrum content to nearby channels in a transmitter. The design of the frequency generation is also made much more complicated due to mm-wave 5G and 6G communication relying on beamforming, in which the signals from multiple antennas are combined to overcome the high path loss at these frequencies. The LO signal must then be distributed to multiple frequency converters while retaining a constant relative
phase shift. If the beamforming is done using so-called LO beamforming, this relative phase shift must also be tunable in a very accurate manner.
In this thesis, five research papers are included; two concern mm-wave frequency generation, two concern multi-GHz integrated baseband filters, and one is about system-level simulations of beamforming receivers. The thesis is divided into two parts, with the first part providing an introduction and context to the conducted research, while the second part consists of the included papers.
Link to thesis i LU Research Portal:
Zoom link. Zoom ID: 66635753300.