Centralized Hybrid Equalization for Cell Free mMIMO mmWave based Systems

Kassam, Joumana; Castanheira, Daniel; Silva, Adão; Dinis, Rui; Gameiro, A.

doi:10.1109/csndsp54353.2022.9907988

Cited by 1 publication

(2 citation statements)

References 17 publications

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“…As an example, Figure 4 compares the bit error rate (BER) performance of both centralized and distributed coordinated beamforming, where C-SC, C-CF, and D-CF refer to the centralized SCs, centralized CF, and distributed CF, respectively. In both figures, the main simulation parameters can be seen in [64,65], where the CF system considers 4 APs, 2 UEs, and 2 receiving RF chains, with the same number of antennas-16 antennas in the transmitter and 16 in the receiver. In the case of SCs, we considered 2 SCs-each one has an AP that can serve a UE.…”

Section: User-centric Cell-freementioning

confidence: 99%

“…In the case of SCs, we considered 2 SCs-each one has an AP that can serve a UE. The left-hand side figure (Figure 4a) evaluated the hybrid analog-digital receiver under a narrow-band channel [64], while the right-hand side figure (Figure 4b) adopted the wide-band channel [65]. In Figure 4a, the performance of the CF hybrid system is quite close to that of the full-digital one, meaning CF systems where channels are sparse hybrid architectures are more energy-efficient than full-digital counterparts achieving similar performance.…”

Section: User-centric Cell-freementioning

confidence: 99%

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A Review on Cell-Free Massive MIMO Systems

et al. 2023

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Cell-free massive multiple-input multiple-output (CF mMIMO) can be considered as a potential physical layer technology for future wireless networks since it can benefit from all the advantages of distributed antenna systems (DASs) and network MIMOs, such as macro-diversity gain, high channel capacity, and link reliability. CF mMIMO systems offer remarkable spatial degrees of freedom and array gains to mitigate the inherent inter-cell interference (ICI) of cellular networks. In such networks, several distributed access points (APs) together with precoding/detection processing can serve many users while sharing the same time-frequency resources. Each AP can be equipped with single or multiple antennas, and hence, can provide a consistently adequate service to all users regardless of their locations in the network. This paper presents a detailed overview of the current state-of-the-art on CF systems. First, it performs a literature review of the conventional CF and scalable user-centric (UC) CF mMIMO systems in terms of the limited capacity of the fronthaul links and the connection between APs and user equipments (UEs). As beyond networks will rely on higher frequency bands, it is of paramount importance to discuss the impact of beamforming techniques that are being investigated. Finally, some of the CF promising enabling technologies are presented to emphasize the main applications in these networks.

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Section: User-centric Cell-freementioning

confidence: 99%

Section: User-centric Cell-freementioning

confidence: 99%