New Sub-Terahertz Design and Test Techniques for 6G Research
Tuesday, 7 June 2022, 14:00-15:30/16:00-17:30
(Room to be defined)
- Greg Jue (Keysight Technologies, )
Motivation and Background
Sub-Terahertz (sub-THz) frequencies (100-300 GHz) with extreme modulation bandwidths are part of early 6G research. This presents many unknowns. One of those unknowns is exploring the level of system performance that is achievable and reasonable given new frequency bands, extreme modulation bandwidths, and new waveforms. This workshop will provide insight into this by discussing new sub-THz system-level design and test challenges presented by 6G. Next generation communications system modelling will be investigated and explored in simulation using system design software. Case studies will be shown for new waveform types and numerologies, 6G RF simulation test bench, ultra-wideband transceiver architectures, and wireless channel propagation characteristics and models. Important techniques for performing EVM measurements at D-band (110-170 GHz), G-band (140-220 GHz), and H-band (220-330 GHz) will be discussed. EVM measurements will be presented, showing residual EVM performance achievable in each of these frequency bands. Theoretical. A testbed Over-the-Air (OTA) demonstration will be shown for >100 Gb/s theoretical raw calculated data rate. Low Signal-to-Noise (SNR) ratios are a challenge for wide bandwidth waveforms at sub-THz frequencies. Preamble and pilot-aided synchronization and channel estimation will be discussed to achieve more robust demodulation in low SNR environments. Understanding and addressing channel impairments at sub-THz frequencies will be another challenge. Multiple sub-THz channel sounding approaches will be discussed, compared, and contrasted. A channel sounding case study will be presented for 144 GHz. The testbed receiver will be customized with a real-time adaptive equalizer FPGA implementation to address channel impairments. Multiple noise figure measurement techniques will be discussed, using signal analyzers as well as vector network analyzers. A novel approach for component-level wideband modulated signal
analysis using a vector network analyzer will be shown. Comparison to conventional signal source and signal analyzer approaches will be discussed.
This workshop will be comprised of key topics relevant to active 6G research:
Title: Digital Twin- Next Generation Communications System Modelling
Presenter: Greg Jue, Keysight
Abstract: This live software simulation demonstration will provide practical examples of beyond 5G and 6G system design. The examples address following research topics: The new waveform research, ultra-wideband transceiver architecture, physic-based channel parameterization and modelling, and sub-terahertz software testbedTitle: The Move from Scientific to Commercial Applications- 5G, 6G &
Presenter: Jeffrey Hesler, Virginia Diodes Inc. (VDI)
Abstract: The Terahertz field has long been used for a wide variety of scientific applications. Recent technological advances have enabled rapid progress in a variety of applications ranging from basic test & measurement to ultra-wideband communications. The talk will present examples showing the change from custom scientific instrumentation to general THz test and measurement with state-of-the-art performance. The talk will focus in particular on the generation and detection of broadband signals for use in 5G/6G and THz vector network analysis. These modules serve as part of a sub-THz testbed for 6G research to perform channel sounding, evaluate candidate 6G waveforms, and evaluate EVM performance with extremely wide-bandwidth waveforms.
Title: A New Sub-THz Testbed for 6G Research
Presenter: Greg Jue, Keysight
Abstract: One of the unknowns for 6G research is exploring the level of system performance that is achievable and reasonable given new frequency bands, extreme modulation bandwidths, and new waveforms. This paper will provide insight into this by discussing new sub- terahertz system-level design and test challenges presented by 6G. EVM measurement results at 144 GHz and 310 GHz will be shown with varying waveforms and occupied bandwidths from 10-30 GHz. A testbed Over-the-Air (OTA) demonstration will be shown for >100 Gb/s theoretical raw calculated data rate. Low Signal-to-Noise (SNR) ratios are a challenge for wide bandwidth waveforms at sub-THz frequencies. Preamble and pilot-aided synchronization and channel estimation will be discussed to achieve more robust demodulation in low SNR environments. Understanding and addressing channel impairments at sub-THz frequencies will be another challenge. Sub-THz channel sounding will be discussed, and the testbed receiver will be customized with a realtime adaptive equalizer FPGA implementation to address channel impairments.
Title: Measurement challenges and experiences with first 6G radio component prototypes
Presenter: Marko E. Leinonen, University of Oulu, Finland
Abstract: This talk will address some measurements challenges which have been faced during the first 6G radio component measurements. The extreme datarate 6G systems will be deployed significantly higher frequencies than current 5G systems. The 6G frequencies will span from 100 GHz to 300 GHz, and these frequencies will introduce new challenges in RF measurements. The 6G measurements will utilize waveguide connections instead of coaxial cables in 5G measurement leading reduced mechanical flexibility of the setups, and thus new measurement methods are needed. Additionally, repeatability of the measurements, and radio interference tolerance during the 6G measurements will be discussed in the talk Title: Sub-THz Characterization for 6G Devices
Presenter: Suren Singh, Keysight
Abstract: With the adoption of sub-THz frequencies for the design of 6G communication systems there is a growing demand for device characterization at these Frequencies. In this session we will consider the architecture of a measurement solution and challenges as we start to address the sub-THz frequencies. In particular we will consider the application for on-wafer measurement solutions and look at some of the key measurement applications. We will look at different approaches to making sub-THz Noise figure measurements. In addition, we will review the application of the VNA for 6G channel characterization using the built-in time domain capability.
Title: Wideband D-Band Measurements Using VSA with a VNA
Presenter: Joel Dunsmore, Keysight
Abstract: Wideband Modulated Signals at 144 GHz with digital predistortion is used to test the EVM of a 144 GHz D-band amplifier. Here we show that a wideband signal is upconverted using a mm-wave extender, which distorts the signal, and down-converted, using a linear down-converter. The output of
the chain is used to pre-distort the signal before up-conversion resulting a low EVM for the chain. Finally, an amplifier is inserted between up- and down-converters and the gain, phase, delay and EVM of the inserted amplifier is measured. This utilizes a vector network analyzer with built-in DDS sources to generate the wideband signal and measure the response.