Performance Analysis of THz Wireless Systems in the Presence of Antenna Misalignment and Phase Noise

Papasotiriou, Evangelos N.; Boulogeorgos, Alexandros–Apostolos A.; Alexiou, Angeliki

doi:10.1109/lcomm.2020.2981336

Cited by 52 publications

(23 citation statements)

References 19 publications

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“…For ultra-high-rate THz communication systems, the impacts of phase noise on transmitted signals are considered to be frequencydependent [11], [30]. On one hand, the lower-frequency components in the power spectral density (PSD) of phase noise contribute to phase errors of the THz signals; On the other hand, the higher-frequency components cause inter-carrier interference (ICI) to the adjacent carriers [10].…”

Section: System Modelmentioning

confidence: 99%

“…Firstly, in comparison with communication systems operating at lower-frequency bands, THz signals suffer from more severe attenuation induced by free-space path loss and molecular absorption effects from atmospheric particles like H 2 O [9]. To address this issue, highgain directional antennas (or antenna arrays with beamforming) are often invoked to maintain both the coverage and the quality of THz signals [8], [10]. Aside from the channel peculiarities, another critical point that limits the performance of THz wireless communications is hardware imperfection, which includes local-oscillator (LO) phase noise, in-phase/quadrature (I/Q) imbalance, and nonlinearity of the power amplifier [11], [12].…”

Section: Introductionmentioning

confidence: 99%

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Terahertz Wireless Communications With Flexible Index Modulation Aided Pilot Design

Mao

Hanzo

2021

IEEE J. Select. Areas Commun.

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Terahertz (THz) wireless communication is envisioned as a promising technology, which is capable of providing ultra-high-rate transmission up to Terabit per second. However, some hardware imperfections, which are generally neglected in the existing literature concerning lower data rates and traditional operating frequencies, cannot be overlooked in the THz systems. Hardware imperfections usually consist of phase noise, in-phase/quadrature imbalance, and nonlinearity of power amplifier. Due to the timevariant characteristic of phase noise, frequent pilot insertion is required, leading to decreased spectral efficiency. In this paper, to address this issue, a novel pilot design strategy is proposed based on index modulation (IM), where the positions of pilots are flexibly changed in the data frame, and additional information bits can be conveyed by indices of pilots. Furthermore, a turbo receiving algorithm is developed, which jointly performs the detection of pilot indices and channel estimation in an iterative manner. It is shown that the proposed turbo receiver works well even under the situation where the prior knowledge of channel state information is outdated. Analytical and simulation results validate that the proposed schemes achieve significant enhancement of bit-error rate performance and channel estimation accuracy, whilst attaining higher spectral efficiency in comparison with its classical counterpart.

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Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Terahertz Wireless Communications With Flexible Index Modulation Aided Pilot Design

Mao

Hanzo

2021

IEEE J. Select. Areas Commun.

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“…Since the THz wave is quasi-optical [59], the study in [26] argued that the misalignment fading can be modeled from a pointing error model in freespace optical communications [60]. After this statistical misalignment fading model is proposed, it has been used in many subsequent studies [47,[61][62][63].…”

Section: Misalignment Fadingmentioning

confidence: 99%

THz channel modeling: Consolidating the road to THz communications

Liu

Guo

et al. 2021

China Commun.

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For the sake of meeting the demand of data rates at terabit (Tbit) per second scale in future networks, the terahertz (THz) band is widely accepted as one of the potential key enabling technologies for next generation wireless communication systems. With the progressive development of THz devices, regrading THz communications at system level is increasing crucial and captured the interest of plenty of researchers. Within this scope, THz channel modeling serves as an indispensable and fundamental element. By surveying the latest literature findings, this paper reviews the problem of channel modeling in the THz band, with an emphasis on molecular absorption loss, misalignment fading and multipath fading, which are major influence factors in the THz channel modeling. Then, we focus on simulators and experiments in the THz band, after which we give a brief introduction on applications of THz channel models with respects to capacity, security, and sensing as examples. Finally, we discuss some key issues in the future THz channel modeling.

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“…The effect of local oscillator hardware impairments, further, can be more severe than misalignment issues. The performance of THz systems is studied under the joint impact of PN and misalignment fading in [134], and under the joint impact of PN and amplifier non-linearities in [135]. The impact of these errors, when lumped into PN at the local oscillator, is further studied under different transceiver architectures in [136].…”

Section: A Performance Analysis Frameworkmentioning

confidence: 99%

An Overview of Signal Processing Techniques for Terahertz Communications

Sarieddeen¹,

Alouini²,

Al-Naffouri³

2020

Preprint

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Terahertz (THz)-band communications are a key enabler for future-generation wireless communication systems that promise to integrate a wide range of data-demanding applications. Recent advancements in photonic, electronic, and plasmonic technologies are closing the gap in THz transceiver design. Consequently, prospect THz signal generation, modulation, and radiation methods are converging, and the corresponding channel model, noise, and hardware-impairment notions are emerging. Such progress paves the way for well-grounded research into THz-specific signal processing techniques for wireless communications. This tutorial overviews these techniques with an emphasis on ultra-massive multiple-input multiple-output (UM-MIMO) systems and reconfigurable intelligent surfaces, which are vital to overcoming the distance problem at very high frequencies. We focus on the classical problems of waveform design and modulation, beamforming and precoding, index modulation, channel estimation, channel coding, and data detection. We also motivate signal processing techniques for THz sensing and localization.

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Performance Analysis of THz Wireless Systems in the Presence of Antenna Misalignment and Phase Noise

Cited by 52 publications

References 19 publications

Terahertz Wireless Communications With Flexible Index Modulation Aided Pilot Design

Terahertz Wireless Communications With Flexible Index Modulation Aided Pilot Design

THz channel modeling: Consolidating the road to THz communications

An Overview of Signal Processing Techniques for Terahertz Communications

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