Capacity Analysis of Cooperative NOMA-OAM-MIMO Based Full-Duplex Relaying for 6G

Amin, Aziz; Shin, Soo Young

doi:10.1109/lwc.2021.3068654

Cited by 45 publications

(35 citation statements)

References 15 publications

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“…Applying [28, Eq. (6.561.16)], T nl (p) from ( 33) is given in (21). Then, based on the pth moment of T nl , we can represent T nl via Gamma distribution such as (3) and (4) [13].…”

Section: Performance Analysismentioning

confidence: 99%

“…Consequently, the received signal power at the receiver in the case with cooperative communication is significantly enhanced in comparison with the case without cooperative communication. With many great advantages, the cooperative communication is still a main technique that can be used in 5G and 6G systems, especially when this technique is combined with other new techniques such as energy harvesting, full-duplex, and non-orthogonal multiple access [21].…”

Section: Introductionmentioning

confidence: 99%

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Performance of Cooperative Communication System With Multiple Reconfigurable Intelligent Surfaces Over Nakagami-m Fading Channels

et al. 2022

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In this paper, the advantages of multiple reconfigurable intelligent surfaces (RISs) assisted wireless systems and direct link between two terminals are exploited by considering a cooperative communication system where reflecting links created by multiple RISs and the direct link are combined at the receiver. We mathematically analyze the performance of the cooperative multiple RISs -direct link (RIS-D) system over Nakagami-m fading channels by obtaining the symbol error probability (SEP) expression. In addition, the SEP of the single-input single-output (SISO) system without RISs (i.e., there is only direct link between two terminals) is also obtained for convenience in comparison the performance of the cooperative RIS-D and SISO systems. We demonstrate the correctness of the derived expressions via Monte-Carlo simulations. Numerical results show that the SEP of the cooperative RIS-D system significantly lower than that of the SISO system for a certain transmission power of the transmitter. Also, for a certain SEP target, the cooperative RIS-D system can greatly save energy consumption in comparison with the SISO system. Specifically, increasing the number of RISs or the number of reflecting elements (REs) in the RISs can remarkably reduce the SEP of the cooperative RIS-D system. On the other hand, the impacts of the system parameters such as the number of RISs, the number of REs, and the Nakagami-m fading channels are fully investigated to clearly indicate their influences on the SEP of the cooperative RIS-D system.

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“…Applying [28, Eq. (6.561.16)], T nl (p) from ( 33) is given in (21). Then, based on the pth moment of T nl , we can represent T nl via Gamma distribution such as (3) and (4) [13].…”

Section: Performance Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of Cooperative Communication System With Multiple Reconfigurable Intelligent Surfaces Over Nakagami-m Fading Channels

et al. 2022

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“…The theoretical capacity of Rx 1 (C T 1 ) and the theoretical capacity of Rx M (C T M ) are expressed by the equations below in the case of the OAM-MIMO-RASK scheme [32]:…”

Section: Theoretical Capacity Analysis Of Oam-mimo-raskmentioning

confidence: 99%

“…Moreover, the theoretical capacity of SC (C T S ) for the OAM-MIMO-RASK scheme can be expressed by the equations below [32]:…”

Section: Theoretical Capacity Analysis Of Oam-mimo-raskmentioning

confidence: 99%

Orbital Angular Momentum-Based Multiple-Input-Multiple- Output with Receive Antenna Shift Keying for 6G

2021

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Spectral efficiency is a major concern for future 6G wireless communication systems. Thus, an appropriate scheme is needed to provide channel capacity improvement for multiple transmitters and receiver-based wireless communication systems without consuming extra resource for communication (e.g., frequency/time/code) or causing interference. Therefore, to fulfill the mentioned requirements for the future 6G wireless network, orbital angular momentum-based multiple-input-multiple-output (OAM-MIMO) multiplexing technique is incorporated with the receive antenna shift keying (RASK) technique in this study (termed as the OAM-MIMO-RASK scheme). OAM-MIMO-RASK can transfer multiple symbols from multiple transmitters to different receivers simultaneously by using multiple subchannels using the OAM and RASK techniques without any interference or additional resource (frequency/time/code). The numerical results illustrated that the proposed OAM-MIMO-RASK can achieve almost double capacity than the existing OAM-MIMO scheme and significantly higher capacity than the existing RASK-based scheme for different values of signal-to-noise ratio. Moreover, the simulation result is validated by the theoretical result which is also shown by the numerical result. In addition, due to different normalized distances from the transmitters and receivers, the proposed OAM-MIMO-RASK scheme can achieve almost double capacity than the existing OAM-MIMO scheme by using OAM-MIMO and RASK technique effectively which is also depicted by the numerical results.

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“…In [13], the authors proposed that the hardware distortion in massive MIMO has negligible impact on SE compare with the that in single antenna user case. [14] proposed a cooperative non-orthogonal multiple access based MIMO system model for 6G to improve the capacity of cell edge user and sum channel capacity. [15] analyzed the asymptotic performance of multi-user MIMO communications with different linear receivers.…”

Section: Introductionmentioning

confidence: 99%

Multi-User Holographic MIMO Surfaces: Channel Modeling and Spectral Efficiency Analysis

Wei,

Huang,

Alexandropoulos

et al. 2021

Preprint

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The multi-user Holographic Multiple-Input and Multiple-Output Surface (MU-HMIMOS) paradigm, which is capable of realizing large continuous apertures with minimal power consumption, has been recently considered as an energyefficient solution for future wireless networks, offering the increased flexibility in impacting electromagnetic wave propagation according to the desired communication, localization, and sensing objectives. The tractable channel modeling of MU-HMIMOS systems is one of the most critical challenges, mainly due to the coupling effect induced by the excessively large number of closely spaced patch antennas. In this paper, we focus on this challenge for downlink multi-user communications and model the electromagnetic channel in the wavenumber domain using the Fourier plane wave representation. Based on the proposed channel model, we devise the maximum-ratio transmission and Zero-Forcing (ZF) precoding schemes capitalizing on the sampled channel variance that depends on the number and spacing of the patch antennas in MU-HMIMOS, and present their analytical spectral efficiency performance. Moreover, we propose a low computational ZF precoding scheme leveraging Neumann series expansion to replace the matrix inversion, since it is practically impossible to perform direct matrix inversion when the number of patch antennas is extremely large. Our extensive simulation results showcase the impact of the number of patch antennas and their spacing on the spectral efficiency of the considered systems. It is shown that the more patch antennas and larger spacing results in improved performance due to the decreased correlation among the patches. In addition, it is demonstrated that our theoretical performance expressions approximate sufficiently well the simulated spectral efficiency, even for the highly correlated cases, thus verifying the effectiveness and robustness of the presented analytical framework.

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Capacity Analysis of Cooperative NOMA-OAM-MIMO Based Full-Duplex Relaying for 6G

Cited by 45 publications

References 15 publications

Performance of Cooperative Communication System With Multiple Reconfigurable Intelligent Surfaces Over Nakagami-m Fading Channels

Performance of Cooperative Communication System With Multiple Reconfigurable Intelligent Surfaces Over Nakagami-m Fading Channels

Orbital Angular Momentum-Based Multiple-Input-Multiple- Output with Receive Antenna Shift Keying for 6G

Multi-User Holographic MIMO Surfaces: Channel Modeling and Spectral Efficiency Analysis

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