Toward Mobile Integrated Electronic Systems at THz Frequencies

Hillger, Philipp; Delden, Marcel van; Thanthrige, Udaya Sampath Miriya; Ahmed, Aya Mostafa; Wittemeier, Jonathan; Arzi, Khaled; Andree, Marcel; Sievert, Benedikt; Prost, W.; Rennings, Andreas; Erni, Daniel; Musch, Thomas; Weimann, Nils; Sezgin, Aydin; Pohl, Nils; Pfeiffer, Ullrich R.

doi:10.1007/s10762-020-00699-x

Cited by 44 publications

(26 citation statements)

References 107 publications

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“…A KEY component of millimeter-wave (mm-wave) and THz sensing is the antenna used to transmit the front-end signal into free-space [1]. While voltage-controlled oscillators can offer over 30% relative tuning range in the mm-wave spectrum [2], the system's resolution is often limited to the antenna's bandwidth when using on-chip antennas [3].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Group Delay Dispersion on Radar Imaging With Multiresonant Antennas

Wittemeier

Sievert

Dedic

et al. 2022

IEEE Microw. Wireless Compon. Lett.

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Radar sensing has become very popular over the last two decades, and research has focused on high-bandwidth and high-resolution systems. Due to the steadily increasing center frequency of front-end circuits, on-chip antennas are the preferred choice over PCB antennas and horn antennas when frequencies get close to THz. However, conventional on-chip antennas are severely limited in bandwidth, leading to increased use of wideband and multiresonant on-chip antennas. Besides a more complex design process of multiresonant antennas, they have the disadvantage of a nonconstant dispersive group delay (GD). This reduces the resolution of sensing systems, such as the range resolution and angular resolution of a radar system. In this work, we show how GD affects the imaging properties of a radar system. The measured S-parameter data from a 240-GHz multiresonant antenna are used to generate synthetic intermediate frequency (IF) signals of a rectangular array. Subsequently, simulated 3-D radar images are generated using the backprojection algorithm. These images are compared with those of a nondispersive imaging system. Finally, two compensation methods using a phase correction method and an all-pass filter are explained, and their performance is compared.

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Section: Introductionmentioning

confidence: 99%

The Impact of Group Delay Dispersion on Radar Imaging With Multiresonant Antennas

Wittemeier

Sievert

Dedic

et al. 2022

IEEE Microw. Wireless Compon. Lett.

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“…One key feature anticipated in beyond 5G wireless networks is the migration towards higher frequency bands, namely the terahertz (THz) freqency band (0.1-10 THz). Wireless services at the THz frequency bands benefit from an abundant bandwidth which enables extremely high data rates needed for, e.g., virtual and augmented reality [1], digital twins [2] or radar applications [3]. However, unleashing the potential of THz frequency bands necessitates overcoming key THz challenges, stemming from the channel's uncertainty.…”

Section: Introductionmentioning

confidence: 99%

Reliable Beam Tracking with Dynamic Beamwidth Adaptation in Terahertz (THz) Communications

Karacora¹,

Chaccour²,

Sezgin³

et al. 2022

Preprint

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THz communication is regarded as one of the potential key enablers for next-generation wireless systems. While THz frequency bands provide abundant bandwidths and extremely high data rates, the operation at THz bands is mandated by short communication ranges and narrow pencil beams, which are highly susceptible to user mobility and beam misalignment as well as channel blockages. This raises the need for novel beam tracking methods that take into account the tradeoff between enhancing the received signal strength by increasing beam directivity, and increasing the coverage probability by widening the beam. To address these challenges, a multi-objective optimization problem is formulated with the goal of jointly maximizing the ergodic rate and minimizing the outage probability subject to transmit power and average overhead constraints. Then, a novel parameterized beamformer with dynamic beamwidth adaptation is proposed. In addition to the precoder, an event-based beam tracking approach is introduced that enables reacting to outages caused by beam misalignment and dynamic blockage while maintaining a low pilot overhead. Simulation results show that our proposed beamforming scheme improves average rate performance and reduces the amount of communication outages caused by beam misalignment.Moreover, the proposed event-triggered channel estimation approach enables low-overhead yet reliable communication.

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“…Phase noise is the main distorsion experienced by the signal in the sub-THz bands, which makes its recovery impossible. Therefore, its impact has been widely studied [3]- [7]. Indeed, in [3], Bicais et al compared two models of PN: correlated Wiener plus Gaussian PN, and uncorrelated Gaussian PN (GPN).…”

Section: Introductionmentioning

confidence: 99%

“…In the review of the THz communications advances drawn in [2], the author explained that publications have been numerous since early 2000. Communication systems using all-electronics (such as [7]) or photonics are using carrier frequencies in the range 100 GHz -700 GHz, though the most studied frequency bands lies between 200 GHz and 400 GHz. From this review, researchers have reached over 100 Gbps.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of Digital Modulations in the Presence of Gaussian Phase Noise in the Sub-THz Context

Desombre

Farès

Louët

2021

2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)

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Driven by the need of more available frequency bands, an increasing attention has been paid to the use of sub-THz bands. In such high frequency bands, the signal is expected to be impaired by phase noise, I/Q mismatch, power amplifier non linearities, etc. It has been shown that at such frequencies, with possibly large bandwidth (∼ 50 GHz), Gaussian phase noise models accurately the phase noise. This paper studies the effect of Gaussian phase noise on several waveforms. Here, five performance metrics are used to compare them: Bit Error Rate (BER), Peak-to-Average Power Ratio (PAPR), Adjacent Channel Power Ratio (ACPR), spectral efficiency (SE) and Error Vector Magnitude (EVM). The aim of this comparison is to give recommandations on which waveform to use in this context, depending on the impact of the phase noise on the performance of such transmissions.

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Toward Mobile Integrated Electronic Systems at THz Frequencies

Cited by 44 publications

References 107 publications

The Impact of Group Delay Dispersion on Radar Imaging With Multiresonant Antennas

The Impact of Group Delay Dispersion on Radar Imaging With Multiresonant Antennas

Reliable Beam Tracking with Dynamic Beamwidth Adaptation in Terahertz (THz) Communications

Performance Comparison of Digital Modulations in the Presence of Gaussian Phase Noise in the Sub-THz Context

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