Low-Overhead Beam Training Scheme for Extremely Large-Scale RIS in Near Field

Liu, W.; Pan, Cunhua; Ren, Hong; Shu, Feng; Jin, Shi; Wang, Jiangzhou

doi:10.1109/tcomm.2023.3278728

Cited by 27 publications

(1 citation statement)

References 38 publications

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“…Recent efforts to improve connectivity and achieve higher data rates involve increasing the aperture size of the transceivers and using extremely high-frequency band. Therefore, the concept of extremely large-scale RIS has emerged [231], where large-scale reflecting elements are deployed at the RIS to compensate for the severe multiplicative fading effect in the cascaded channel. Nevertheless, by increasing the size of the RIS, near-field signal propagation will become more dominant, leading to a significant transformation in the electromagnetic field structure.…”

Section: Future Research Directionsmentioning

confidence: 99%

Next Generation Multiple Access with Cell-Free Massive MIMO

Mohammadi,

Mobini,

Ngo

et al. 2023

Preprint

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<p>To meet the unprecedented mobile traffic demands of future wireless networks, a paradigm shift from conventional cellular networks to distributed communication systems is imperative. Cell-free massive multiple-input multiple-output (CF-mMIMO) represents a practical and scalable embodiment of distributed/network MIMO systems. It inherits not only the key benefits of co-located massive MIMO systems but also the macro-diversity gains from distributed systems. This innovative architecture has demonstrated significant potential in enhancing network performance from various perspectives, outperforming co-located mMIMO and conventional small-cell systems. Moreover, CF-mMIMO offers flexibility in integration with emerging wireless technologies such as full-duplex (FD), non-orthogonal transmission schemes, millimeter-wave (mmWave) communications, ultra-reliable low-latency communication (URLLC), unmanned aerial vehicle (UAV)-aided communication, and reconfigurable intelligent surfaces (RISs). In this paper, we provide an overview of current research efforts on CF-mMIMO systems and their promising future application scenarios. We then elaborate on new requirements for CF-mMIMO networks in the context of these technological breakthroughs. We also present several current open challenges and outline future research directions aimed at fully realizing the potential of CF mMIMO systems in meeting the evolving demands of future wireless networks.</p>

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Section: Future Research Directionsmentioning

confidence: 99%