On the Performance of Multihop THz Wireless System Over Mixed Channel Fading with Shadowing and Antenna Misalignment

Bhardwaj, Pranay; Zafaruddin, S. M.

doi:10.48550/arxiv.2110.15952

“…Further, using the relation πCsc(πa) = Γ(a)Γ(1 − a), we denote the denominator in terms of compatible Gamma functions, and applying the definition of Fox's H-function, we get the ergodic capacity in (17).…”

Section: Ergodic Capacitymentioning

confidence: 99%

“…. Finally, we can approximate the ergodic capacity of the hybrid system consisting of RF-MRC and THz using (25) in (15), and apply the similar procedure used for driving (17) to get…”

Section: Performance Of Mrc-rf and Thzmentioning

confidence: 99%

“…Recent works investigate the performance of relay-assisted THz transmissions [8]- [17] and mixed RF-THz systems [18]- [20]. The outage probability for a decode-and-forward (DF) based dual-hop THz-THz system was analyzed in [8], [9].…”

Section: Introductionmentioning

confidence: 99%

“…The authors in [16] proposed a deep reinforcement learning (DRL) based multi-hop reconfigurable intelligent surface (RIS) assisted THz transmissions to extend the coverage range. Recently, we presented the performance of a multihop THz communication system under various channel impairments in [17].…”

Section: Introductionmentioning

confidence: 99%

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Performance of Hybrid THz and Multi-Antenna RF System with Diversity Combining

Bhardwaj¹,

Zafaruddin²

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Recent studies investigate single-antenna radio frequency (RF) systems mixed with terahertz (THz) wireless communications. This paper considers a two-tier system of THz for backhaul and multiple-antenna assisted RF for the access network. We analyze the system performance by employing both selection combining (SC) and maximal ratio combining (MRC) receivers for the RF link integrated with the THz using the fixed-gain amplify and forward (AF) protocol. We develop the probability density function (PDF) and cumulative distribution function (CDF) of the end-to-end signal-to-noise (SNR) of the dual-hop system over independent and non-identically distributed (i.ni.d.) α-µ fading channels with a statistical model for misalignment errors in the THz wireless link. We use the derived statistical results to develop analytical expressions of the outage probability, average bit error rate (BER), and ergodic capacity for the performance assessment of the considered system. We develop diversity order of the system using asymptotic analysis in the high SNR region, demonstrating the scaling of system performance with the number of antennas. We use computer simulations to show the effect of system and channel parameters on the performance of the hybrid THz-RF link with multiantenna diversity schemes.

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“…For ease of presentation, we denote φ i = N + 1 − i and 4), and use the method described in [43] for terahertz (THz) multihop system to develop the PDF of SNR for N -hop OWC system:…”

Section: Long-range Owc Systemmentioning

confidence: 99%

Multihop Optical Wireless Communication Over ${\cal{F}}$-Turbulence Channels and Generalized Pointing Errors with Fog-Induced Fading

Rahman¹,

Zafaruddin²,

Chaubey³

2022

Preprint

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Multihop relaying is a potential technique to mitigate channel impairments in optical wireless communications (OWC). In this paper, multiple fixed-gain amplify-and-forward (AF) relays are employed to enhance the OWC performance under the combined effect of atmospheric turbulence, pointing errors, and fog. We consider a long-range OWC link by modeling the atmospheric turbulence by the Fisher-Snedecor F distribution, pointing errors by the generalized non-zero boresight model, and random path loss due to fog. We also consider a short-range OWC system by ignoring the impact of atmospheric turbulence. We derive novel upper bounds on the probability density function (PDF) and cumulative distribution function (CDF) of the end-toend signal-to-noise ratio (SNR) for both short and long-range multihop OWC systems by developing exact statistical results for a single-hop OWC system under the combined effect of Fturbulence channels, non-zero boresight pointing errors, and foginduced fading. Based on these expressions, we present analytical expressions of outage probability (OP) and average bit-error-rate (ABER) performance for the considered OWC systems involving single-variate Fox's H and Meijer's G functions. Moreover, asymptotic expressions of the outage probability in high SNR region are developed using simpler Gamma functions to provide insights on the effect of channel and system parameters. The derived analytical expressions are validated through Monte-Carlo simulations, and the scaling of the OWC performance with the number of relay nodes is demonstrated with a comparison to the single-hop transmission.

show abstract

Multihop Optical Wireless Communication Over ${\mathcal {F}}$-Turbulence Channels and Generalized Pointing Errors With Fog-Induced Fading

Rahman

¹

,

Zafaruddin

²

,

Chaubey

³

2022

Self Cite

View full text Add to dashboard Cite

Multihop relaying is a potential technique to mitigate channel impairments in optical wireless communications (OWC). In this paper, multiple fixed-gain amplify-and-forward (AF) relays are employed to enhance the OWC performance under the combined effect of atmospheric turbulence, pointing errors, and fog. We consider a long-range OWC link by modeling the atmospheric turbulence by the Fisher-Snedecor F distribution, pointing errors by the generalized non-zero boresight model, and random path loss due to fog. We also consider a short-range OWC system by ignoring the impact of atmospheric turbulence. We derive novel upper bounds on the probability density function (PDF) and cumulative distribution function (CDF) of the end-toend signal-to-noise ratio (SNR) for both short and long-range multihop OWC systems by developing exact statistical results for a single-hop OWC system under the combined effect of Fturbulence channels, non-zero boresight pointing errors, and foginduced fading. Based on these expressions, we present analytical expressions of outage probability (OP) and average bit-error-rate (ABER) performance for the considered OWC systems involving single-variate Fox's H and Meijer's G functions. Moreover, asymptotic expressions of the outage probability in high SNR region are developed using simpler Gamma functions to provide insights on the effect of channel and system parameters. The derived analytical expressions are validated through Monte-Carlo simulations, and the scaling of the OWC performance with the number of relay nodes is demonstrated with a comparison to the single-hop transmission.

show abstract

On the Performance of Multihop THz Wireless System Over Mixed Channel Fading with Shadowing and Antenna Misalignment

Cited by 3 publications

References 44 publications

Performance of Hybrid THz and Multi-Antenna RF System with Diversity Combining

Performance of Hybrid THz and Multi-Antenna RF System with Diversity Combining

Multihop Optical Wireless Communication Over ${\cal{F}}$-Turbulence Channels and Generalized Pointing Errors with Fog-Induced Fading

Multihop Optical Wireless Communication Over ${\mathcal {F}}$-Turbulence Channels and Generalized Pointing Errors With Fog-Induced Fading

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