Propagation Modeling for Wireless Communications in the Terahertz Band

Han, Chong; Chen, Yi

doi:10.1109/mcom.2018.1700898

Cited by 228 publications

(166 citation statements)

References 15 publications

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“…Despite the fact that THz band communications can offer an unprecented increase in the bandwidth and support ultra high data rates, yet they suffer from severe path attenuations, transceivers antenna misalignment as well as hardware imperfections [8]. The path attenuation originates from the high frequencies of this band, which cause interaction and energy absorption by the molecules of the propagation medium [9]. As a result, a great amount of effort was put in modeling the THz channel particularities [10], evaluating their impact on the system's performance [11], [12] and proposing countermeasures [13]- [18].…”

Section: Introductionmentioning

confidence: 99%

Analytical Performance Assessment of THz Wireless Systems

2019

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This paper is focused on providing the analytical framework for the quantification and evaluation of the joint effect of misalignment fading and hardware imperfections in the presence of multipath fading at terahertz (THz) wireless fiber extenders. In this context, we present the appropriate system model that incorporates the different operation, design, and environmental parameters. In more detail, it takes into account the transceivers antenna gains, the operation frequency, the distance between the transmitter (TX) and the receiver (RX), the environmental conditions, i.e., temperature, humidity, and pressure, the spatial jitter between the TX and RX antennas that results to antennas misalignment, the level of transceivers' hardware imperfections, and the stochastic characteristics of the wireless channel. Based on this model, we analyze and quantify the joint impact of misalignment and multipath fading by providing novel closedform expressions for the probability and cumulative density functions of the composite channel. Moreover, we derive exact closed-form expressions for the outage probability for both cases of ideal and non-ideal radio frequency (RF) front-end. In addition, in order to quantify the detrimental effect of misalignment fading, we analytically obtain the outage probability in the absence of misalignment cases for both cases of ideal and non-ideal RF front-end. In addition, we extract the novel closed-form expressions for the ergodic capacity for the case of the ideal RF front-end and tight upper bounds for both the cases of ideal and non-ideal RF front-end. Finally, an insightful ergodic capacity ceiling for the non-ideal RF front-end case is provided. INDEX TERMS Beyond 5G systems, ergodic capacity, fiber extender, hardware impairments, high frequency communications, misalignment fading, outage probability, performance analysis, terahertz communications, theoretical framework, α-µ fading.

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Section: Introductionmentioning

confidence: 99%

Analytical Performance Assessment of THz Wireless Systems

2019

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“…THz channel-modeling approaches are deterministic, statistical, or hybrid [10]. Deterministic channel modeling depends on site geometry and is often accomplished via ray-tracing (RT) techniques that are capable of handling site-specific structures.…”

Section: A Thz Channel Modelingmentioning

confidence: 99%

Ultramassive MIMO Systems at Terahertz Bands: Prospects and Challenges

Faisal

Sarieddeen

Dahrouj

et al. 2020

IEEE Veh. Technol. Mag.

124

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Terahertz (THz)-band communications are currently being celebrated as a key technology that could fulfill the increasing demands for wireless data traffic in the upcoming sixth-generation (6G) of wireless communications. Many challenges, such as high propagation losses and power limitations, which result in short communication distances, have yet to be addressed for this technology to be realized. Ultra-massive multiple-input, multiple-output (UM-MIMO) antenna systems have emerged as practical means for combatting this distance problem, thereby increasing system capacity. Towards that end, graphene-based nano-antennas have recently been proposed, as they can be individually tuned and collectively controlled in compact UM-MIMO array-of-sub-arrays architectures. In this paper, we present a holistic overview of THz UM-MIMO systems. We assess recent advancements in transceiver design and channel modeling, and discuss the major challenges and shortcomings of such designs by deriving the relationship between communication range, array dimensions, and system performance. We further highlight several research advances that could enhance resource allocation at the THz band, including waveform designs, multicarrier configurations, and spatial modulations. Based on this discussion, we highlight prospective use cases that can bring THz UM-MIMO into reality in the context of sensing, data centers, cell-free systems, and mid-range wireless communications.

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“…And THz technologies have been widely studied for a range of applications, such as THz radar, THz communication and THz imaging . In these applications, THz wave transmission in the real environment is a key issue that needs to be evaluated carefully. For instance, the atmospherical attenuation contributes considerably to the shading effect of THz transmission.…”

Section: Introductionmentioning

confidence: 99%

Low‐loss frequency selective surface for multi‐band THz transmission measurement

Yang¹,

Zeng²,

Liu

et al. 2020

Micro & Optical Tech Letters

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Frequency selective surface is a key component in a quasi‐optical system enabling multi‐band operation. This work presents the design, fabrication and measurement of a low‐loss frequency selective surface in a quasi‐optical system for terahertz transmission measurement to separate 220 to 260 GHz and 325 to 340 GHz bands. High‐precision milling technique was employed for fabrication. The measurement was conducted using a terahertz time domain spectroscopy and a home‐made quasi‐optical test bench. Good agreement was achieved between the measured results and simulated ones. The design and measurement methods can be applied to frequency selective surfaces working in other millimeter wave bands.

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Propagation Modeling for Wireless Communications in the Terahertz Band

Cited by 228 publications

References 15 publications

Analytical Performance Assessment of THz Wireless Systems

Analytical Performance Assessment of THz Wireless Systems

Ultramassive MIMO Systems at Terahertz Bands: Prospects and Challenges

Low‐loss frequency selective surface for multi‐band THz transmission measurement

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