Exact Analysis of RIS-Aided THz Wireless Systems Over <i>α</i>-<i>μ</i> Fading With Pointing Errors

Chapala, Vinay Kumar; Zafaruddin, S. M.

doi:10.1109/lcomm.2021.3110865

Cited by 40 publications

(16 citation statements)

References 27 publications

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“…We use (14) in (13) and apply the definition of Nmultivariate Fox's H-function in [25, A.1] to get (3). We use similar steps to compute the CDF as…”

Section: Appendix A: Pdf and Cdfmentioning

confidence: 99%

“…Recently, there has been an extensive study exploring the benefits of the RIS approach for variety of wireless communication networks such as radio-frequency (RF) [4]- [10], free-space optics (FSO) [11], [12], and terahertz (THz) [13], [14]. More specifically, the authors analyzed the performance of RIS-assisted RF systems over Rayleigh fading model in [4], Rician fading in [5], Nakagami-m channel model in [6], [7] and fluctuating two rays (FTR) fading model for RISassisted mmWave communications in [10].…”

Section: Introductionmentioning

confidence: 99%

“…In [12], an unified performance analysis for a FSO system was presented considering different atmospheric turbulence models and pointing errors. The authors in [13], [14] analyzed RIS-aided THz communications over different fading channel models combined with antenna misalignment and hardware impairments.…”

Section: Introductionmentioning

confidence: 99%

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RIS-Assisted Vehicular Network with Direct Transmission over Double-Generalized Gamma Fading Channels

Chapala¹,

Malik²,

Zafaruddin³

2022

Preprint

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Reconfigurable intelligent surface (RIS) can provide stable connectivity for vehicular communications when direct transmission becomes significantly weaker with dynamic channel conditions between an access point and a moving vehicle. In this paper, we analyze the performance of a RIS-assisted vehicular network by coherently combining received signals reflected by RIS elements and direct transmissions from the source terminal over double generalized Gamma (dGG) fading channels. We present analytical expressions on the outage probability and average bit-error rate (BER) performance of the considered system by deriving exact density and distribution functions for the end-to-end signal-to-noise ratio (SNR) resulted from the finite sum of the direct link and product of channel coefficients each distributed according to the dGG. We also develop asymptotic analysis on the outage probability and average BER to derive diversity order for a better insight into the system performance at high SNR. We validate the derived analytical expressions through numerical and simulation results and demonstrate scaling of the system performance with RIS elements and a comparison to the conventional relaying techniques and direct transmissions considering various practically relevant scenarios.

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“…We use (14) in (13) and apply the definition of Nmultivariate Fox's H-function in [25, A.1] to get (3). We use similar steps to compute the CDF as…”

Section: Appendix A: Pdf and Cdfmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

RIS-Assisted Vehicular Network with Direct Transmission over Double-Generalized Gamma Fading Channels

Chapala¹,

Malik²,

Zafaruddin³

2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition to the channel fading, there occurs a misalignment error known commonly as pointing errors due to the highly directional nature of THz communication links and the dynamic positional behavior of transceiver antennas [5]. Due to the lack of statistical model for pointing errors specific to THz system, initial research on RIS-THz [6], [7] assumed zero-boresight pointing errors of free-space optics (FSO) [8], which caters to only a special case of THz transmission. It should be mentioned the mathematical representation of the zero-boresight pointing errors facilitates a straightforward analysis when combined with the α-µ fading [9]- [13].…”

Section: Introductionmentioning

confidence: 99%

RIS-THz Wireless Communication with Random Phase Noise and Misaligned Transceiver

Durgada¹,

Chapala²,

Zafaruddin³

2022

Preprint

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Existing research works on reconfigurable intelligent surfaces (RIS) based terahertz (THz) system ignores the effect of phase noise and employ the zero-boresight pointing errors model of the free-space optics channel in performance analysis. In this paper, we analyze the performance of RIS-THz transmission under the combined effect of channel fading, THz pointing error (TPE), and statistical phase noise due to imperfect phase compensation at each RIS element. First, we derive statistical results of the double α-µ fading combined with the TPE and phase noise at individual RIS elements using single-variate Fox's function. Next, we use the multi-variate Fox's H-function representation to develop exact analytical expressions for the density and distribution functions of the resultant signal-to-noise ratio (SNR) of the RIS-THz link considering the accumulating propagation effect from all RIS elements. Using the derived statistical results, we analyze the exact and asymptotic expressions for the considered system's outage probability and average biterror rate (BER). The analytical results show that the diversity order of the system is independent of phase noise, depends on the channel fading parameters α and µ, and depends on the β parameter of the TPE.

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“…There has been an increased research interest to assess the applicability of RIS based wireless systems for intelligent vehicular communications [6]- [15], radio-frequency (RF) [16]- [24], free-space-optics (FSO) [25]- [30], and terahertz (THz) wireless systems [31]- [33]. The authors in [9] applied series expansion and central limit theorem (CLT) to approximate the outage probability performance of the RIS-assisted vehicular communication assuming Rayleigh and Rician fading channels.…”

Section: Introductionmentioning

confidence: 99%

RIS-Assisted Multihop FSO/RF Hybrid System for Vehicular Communications over Generalized Fading

Chapala¹,

Zafaruddin²

2021

Preprint

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Reconfigurable intelligent surface (RIS) is a promising technology to avoid signal blockage by creating line-ofsight (LOS) connectivity for free-space optical (FSO) and radio frequency (RF) wireless systems. There is limited research on the use of multiple RIS between a source and destination for wireless communications. This paper analyzes the performance of a RISassisted multi-hop transmission for vehicular communications by employing multiple RIS to enable LOS communication and reliable connectivity for a hybrid FSO and RF system. We develop an analytical framework to derive statistical results of the signalto-noise ratio (SNR) of a multi-RIS communication system over general fading models. We use decode-and-forward (DF) and fixed-gain (FG) relaying protocols to mix multi-RIS transmissions over RF and FSO technologies, and derive probability density and distribution functions for both the relaying schemes by considering independent and non-identical double generalized gamma (dGG) distribution models for vehicular RF transmissions and atmospheric turbulence for FSO system combined with zeroboresight pointing errors. We analyze the performance of a moving vehicle connected to one of the RIS modules by deriving exact analytical expressions of the outage probability, average bit-error rate (BER), and ergodic capacity in terms of Fox's H-function. We present asymptotic analysis and diversity order of the outage probability in the high SNR regime to provide a better insight into the system performance. We use computer simulations to demonstrate the effect of multiple RIS modules, fading parameters, and pointing errors on the RIS-aided multihop transmissions for the considered vehicular communication system.

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Exact Analysis of RIS-Aided THz Wireless Systems Over α-μ Fading With Pointing Errors

Cited by 40 publications

References 27 publications

RIS-Assisted Vehicular Network with Direct Transmission over Double-Generalized Gamma Fading Channels

RIS-Assisted Vehicular Network with Direct Transmission over Double-Generalized Gamma Fading Channels

RIS-THz Wireless Communication with Random Phase Noise and Misaligned Transceiver

RIS-Assisted Multihop FSO/RF Hybrid System for Vehicular Communications over Generalized Fading

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