Uplink Performance of MmWave-Fronthaul Cell-Free Massive MIMO Systems

Elhoushy, Salah; Ibrahim, Mohamed; Hamouda, Walaa

doi:10.1109/tvt.2021.3131426

Cited by 16 publications

(7 citation statements)

References 44 publications

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“…Proof: Applying upper bound log r < −1/K and then lower bound exp(k/K) > 1 + k/K in (25), we get the lower bound in (26). For the upper bound, we use geometric series to sum (25) as…”

Section: Analysis For Energy Consumption Performancementioning

confidence: 99%

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Performance of Dual-Hop Relaying for THz-RF Wireless Link Over Asymmetrical $\alpha$-$\mu$ Fading

Bhardwaj

Zafaruddin

2021

IEEE Trans. Veh. Technol.

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The current body of research on terahertz (THz) wireless communications predominantly focuses on its application for single-user backhaul/fronthaul connectivity at sub-THz frequencies. First, we develop a generalized statistical model for signal propagation at THz frequencies encompassing physical layer impairments, including random path-loss with Gamma distribution for the molecular absorption coefficient, short-term fading characterized by the α-η-κ-µ distribution, antenna misalignment errors, and transceiver hardware impairments. Next, we propose random access protocols for a cell-free wireless network, ensuring successful transmission for multiple users with limited delay and energy loss, exploiting the combined effect of random atmospheric absorption, non-linearity of fading, hardware impairments, and antenna misalignment errors. We consider two schemes: a fixed transmission probability (FTP) scheme where the transmission probability (TP) of each user is updated at the beginning of the data transmission and an adaptive transmission probability (ATP) scheme where the TP is updated with each successful reception of the data. We analyze the performance of both protocols using delay, energy consumption, and outage probability with scaling laws for the transmission of a data frame consisting of a single packet from users at a predefined quality of service (QoS).

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“…Proof: Applying upper bound log r < −1/K and then lower bound exp(k/K) > 1 + k/K in (25), we get the lower bound in (26). For the upper bound, we use geometric series to sum (25) as…”

Section: Analysis For Energy Consumption Performancementioning

confidence: 99%

“…Multiuser interference cancellation has been studied extensively for cell-free wireless network [22]- [26]. The interference cancellation requires complex signal processing at the CPU and significant overheads.…”

Section: Introductionmentioning

confidence: 99%

Performance of Dual-Hop Relaying for THz-RF Wireless Link Over Asymmetrical $\alpha$-$\mu$ Fading

Bhardwaj

Zafaruddin

2021

IEEE Trans. Veh. Technol.

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“…Numerous research findings have been presented from a signal processing perspective in the literatures [26][27][28][29][30][31][32] for CF mMIMO systems with limited capacity links that connects the APs to a central processing unit. Moreover, extensive research has been carried out recently on analyzing various digital beamforming techniques that can be applied to cell-free systems with a view to achieve practical deployments.…”

Section: Related Workmentioning

confidence: 99%

An analytical reliability performance assessment of Cell-Free Massive MIMO systems for 5G and Beyond cellular networks

HOSANY,

Dobee

2023

Preprint

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In today’s realm, the 5G cellular networks offer a new era of fully digital environment by connecting people anywhere anytime. This era requires inspiring demands to the networks in terms of spectral and energy efficiencies, low-latency and ultra-reliable communications. A major development to deal with these unparalleled demands is the introduction of Cell-Free Massive MIMO (CF mMIMO) systems to the cellular network. In recent years, mathematical foundations have been laid for a CF mMIMO communication system to evaluate the spectral and energy efficiencies given the number of access points. Various existing literatures have adopted mathematical models to formulate closed-form expressions for these efficiencies using uncorrelated Rayleigh fading for simple linear processing detectors. In this paper, we try to address a compelling and interesting question which has not received much attention lately. The question is how to evaluate the reliability of a connected user terminal in both a CF mMIMO and conventional mMIMO system? We answer this question by first analyzing the signal models for both systems assuming exact channel estimates and consider an uncorrelated Rayleigh fading channel model. The exact Bit Error Rate, as a reliability assessment, in closed-form are then derived based on strong mathematical foundations, which are simple to numerically evaluate in Matlab R2022, for MPSK and MQAM modulation schemes. The mathematical models presented in this work can be used in 5G and Beyond 5G networks to evaluate the distributions of error rates for a user given the number of Access points or Base Station antennas and modulation scheme. Machine Learning algorithms can be applied to the analytical expressions with a view to predict the error performance of a user terminal given the fading characteristic of the propagation environment.

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“…where m ∆ and Ω ∆ are, respectively, the shape and spread parameters; d ∆ is the distance between the transmitter and receiver; f c ≥ 30 GHz is the carrier frequency; G tx /G rx are the transmitter/receiver antenna gains 1 .…”

Section: System Modelmentioning

confidence: 99%

“…Under the fast developments of wireless networks, especially in the beyond 5G (B5G) of mobile communications, the available frequency bands may not satisfy the high capacity demand in practice. In this circumstance, millimeter-wave (mmWave) communications become a key technology [1], [2]. It is because mmWave communication systems use frequency from 30 GHz to 300 GHz.…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of Millimeter-Wave NOMA System With Intelligent Reflecting Surface

Vinh

Tri

2022

IEEE Access

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This paper analyzes the performance of millimeter-wave (mmWave) non-orthogonal multiple access (NOMA) system with the aid of an intelligent reflecting surface (IRS). We derive the outage probability (OP) expressions at two users D 1 and D 2 of the IRS aided mmWave-NOMA system (the IRS-mmWave-NOMA system in the following). We validate the derived expressions via computer simulations. By considering the Nakagami-m fading channels and the path loss model proposed for 5G standard in the IRS-mmWave-NOMA system, our results are more suitable in practical scenarios. Specifically, numerical results observe that even the carrier frequency is extremely high (f c = 90 GHz) and the transmitter-receiver distances are further than 50 m, the OPs at D 1 and D 2 can achieve 10 −4 when the transmit power of base station (BS) is 30 dBm (dB in the following). Moreover, the OPs at D 1 and D 2 with IRS are greatly lower than OPs without IRS. This result demonstrates the huge benefits of utilizing IRS in mmWave-NOMA system. In addition, we can use an IRS with larger number of reflecting elements to maintain the OP performance at D 1 and D 2 when the distances are increased and f c is higher. On the other hand, we should choose a suitable value of power allocation coefficients to obtain the same performance at D 1 and D 2 .INDEX TERMS Non-orthogonal multiple access, millimeter-wave, intelligent reflecting surface, moment function, outage probability.

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Uplink Performance of MmWave-Fronthaul Cell-Free Massive MIMO Systems

Cited by 16 publications

References 44 publications

Performance of Dual-Hop Relaying for THz-RF Wireless Link Over Asymmetrical $\alpha$-$\mu$ Fading

Performance of Dual-Hop Relaying for THz-RF Wireless Link Over Asymmetrical $\alpha$-$\mu$ Fading

An analytical reliability performance assessment of Cell-Free Massive MIMO systems for 5G and Beyond cellular networks

Performance Assessment of Millimeter-Wave NOMA System With Intelligent Reflecting Surface

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