Hybrid Precoding Design for Two-Way Relay-Assisted Terahertz Massive MIMO Systems

Mir, Talha; Waqas, Muhammad; Mir, Usama; Hussain, Syed Mudassir; Elbir, Ahmet M.; Tu, Shanshan

doi:10.1109/access.2020.3044907

Cited by 24 publications

(15 citation statements)

References 32 publications

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“…Relay-assisted communication is a potential technique to deal with channel fading in wireless systems [34]- [36]. The use of relaying at THz frequencies has recently been discussed in [27]- [30]. Relaying for nano-scale THz transmissions was studied in [27], [28].…”

Section: A Related Workmentioning

confidence: 99%

“…The THz link suffers from pointing errors when there is a misalignment between transmitter and receiver antenna beams at higher frequencies besides the signal fading and significantly higher path loss. Recently, the use of THz for wireless communications is gaining research interests [9]- [30]. The authors in [9] proposed a prototype of a wireless local area network at 0.34 THz frequency band.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Dual-Hop Relaying for THz-RF Wireless Link with Asymmetrical Fading

Bhardwaj,

Zafaruddin

2021

Preprint

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Terahertz (THz) frequency bands can be promising for data transmissions between the core network and access points (AP) for next-generation wireless systems. In this paper, we analyze the performance of a dual-hop THz-RF wireless system where an AP facilitates data transmission between a core network and user equipment (UE). We consider a generalized model for the end-to-end channel with independent and not identically distributed (i.ni.d.) fading model for THz and RF links using the α-µ distribution, the THz link with pointing errors, and asymmetrical relay position. We derive a closed-form expression of the cumulative distribution function (CDF) of the end-to-end signal to noise ratio (SNR) for the THz-RF link, which is valid for continuous values of µ for a generalized performance analysis over THz fading channels. Using the derived CDF, we analyze the performance of THz-RF relayed system using decode-andforward (DF) protocol by deriving analytical expressions of diversity order, moments of SNR, ergodic capacity, and average BER in terms of system parameters. We also analyze the considered system with an i.i.d. model, and develop simplified performance to provide insight on the system behavior analytically under various practically relevant scenarios. Simulation and numerical analysis show significant effect of fading parameters of the THz link and a nominal effect of normalized beam-width on the performance of the relay-assisted THz-RF system.

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Section: A Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Dual-Hop Relaying for THz-RF Wireless Link with Asymmetrical Fading

Bhardwaj,

Zafaruddin

2021

Preprint

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“…Recently, dual-hop and multi-hop relaying at THz frequencies have been investigated [8]- [16]. More specifically, the authors in [8] formulated an optimal relaying distance for THzband communication to maximize the network throughput.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the THz link is susceptible to the random pointing errors caused by the misalignment between transmitter and receiver antenna beams and may incur transceiver distortion at higher frequencies in addition to the stochastic multi-path fading [4]- [7]. Alleviating the adverse effects of signal attenuation and fading is desirable for highspeed THz links.Recently, dual-hop and multi-hop relaying at THz frequencies have been investigated [8]- [16]. More specifically, the authors in [8] formulated an optimal relaying distance for THzband communication to maximize the network throughput.…”

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confidence: 99%

Terahertz Wireless Transmissions with Maximal Ratio Combining over Fluctuating Two-Ray Fading

Joshi¹,

Bhardwaj²,

Zafaruddin³

2021

Preprint

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Mitigating channel fading and transceiver impairments are desirable for high-speed terahertz (THz) wireless links. This paper analyzes the performance of a multi-antenna THz wireless system by considering the combined effect of pointing errors and fluctuating two-ray (FTR) fading model. We provide a statistical characterization of the maximal ratio combining (MRC) receiver over independent and nonidentical (i.ni.d.) channel conditions in terms of multi-variate Fox's H by deriving density and distribution functions of the signal-tonoise ratio (SNR) of a single-link THz link using incomplete Gamma function. We develop exact analytical expressions of outage probability, average bit-error-rate (BER), and ergodic capacity for both single-antenna and MRC receivers. We also present the diversity order of the system by deriving asymptotic expressions for outage probability and average BER at high SNR to obtain insights into the system performance. We validate our derived analytical expressions with Monte-Carlo simulations and demonstrate the effect of various system and channel parameters on the performance of single and multi-antenna THz wireless communications.Index Terms-Beyond 5G/6G wireless systems, fluctuating two ray, performance analysis, pointing error, maximal ratio combining, probability distribution function, terahertz communication. I. INTRODUCTIONTerahertz (THz) wireless is an upcoming technology to provide new spectrum resources for future communication systems. The availability of contiguous high bandwidth transmissions in the THz spectrum can be potential for wireless backhaul/fronthaul technology [1]- [3]. The THz spectrum is mostly unlicensed and can support secured terabits per second (Tbps) data transmissions with low latency for various highend applications. The line-of-sight (LOS) THz technology requires high directional antennas with higher gain to compensate for severe path loss due to the molecular absorption of transmitted signals. Nevertheless, the THz link is susceptible to the random pointing errors caused by the misalignment between transmitter and receiver antenna beams and may incur transceiver distortion at higher frequencies in addition to the stochastic multi-path fading [4]- [7]. Alleviating the adverse effects of signal attenuation and fading is desirable for highspeed THz links.Recently, dual-hop and multi-hop relaying at THz frequencies have been investigated [8]- [16]. More specifically, the authors in [8] formulated an optimal relaying distance for THzband communication to maximize the network throughput.

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“…Related Works: The dual-hop relaying for THz and heterogeneous networks has also been discussed in the literature [11]- [16]. In [11], the authors derived a closed-form solution for hybrid precoding in two-way relayed THz multiple input multiple output (MIMO) wireless systems. The sum capacity and energy efficiency of the proposed system were better than existing solutions for the THz MIMO relay system.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Dual-Hop THz Wireless Transmission for Backhaul Applications

Pai¹,

Bhardwaj²,

Zafaruddin

2021

Preprint

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THz transmissions suffer from pointing errors due to antenna misalignment and incur higher path loss because of molecular absorption at such a high frequency. In this paper, we employ an amplify-and-forward (AF) dual-hop relay to mitigate the effect of pointing errors and extend the range of a wireless backhaul network. We provide statistical analysis on the performance of the considered system by deriving analytical expressions for the outage probability, average bit-error-rate (BER), average signal-to-noise ratio (SNR), and a lower bound on the ergodic capacity over independent and identical (i.i.d) αµ fading model and statistical pointing errors. Using computer simulations, we validate the derived analysis of the relay-assisted system. We demonstrate the effect of the system parameters on outage probability and average BER with the help of diversity order. We show that data rates up to several Gbps can be achieved using THz transmissions, which is desirable for next-generation wireless systems, especially for backhaul applications.

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Hybrid Precoding Design for Two-Way Relay-Assisted Terahertz Massive MIMO Systems

Cited by 24 publications

References 32 publications

Performance Analysis of Dual-Hop Relaying for THz-RF Wireless Link with Asymmetrical Fading

Performance Analysis of Dual-Hop Relaying for THz-RF Wireless Link with Asymmetrical Fading

Terahertz Wireless Transmissions with Maximal Ratio Combining over Fluctuating Two-Ray Fading

Performance Analysis of Dual-Hop THz Wireless Transmission for Backhaul Applications

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