Performance Analysis of Active Large Intelligent Surfaces (LISs): Uplink Spectral Efficiency and Pilot Training
Citations
463 citations
Cites methods from "Performance Analysis of Active Larg..."
...As for using RISs for transmission and reception, researchers focused their attention on outage probability [88], asymptotic data rate [89], and uplink spectral efficiency [90]....
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343 citations
Cites background from "Performance Analysis of Active Larg..."
...Additionally, current research contributions mainly consider the performance optimization for both single-user and multi-user scenarios by optimizing the phase shift and/or pre-coding solutions of the RIS-enhanced system [6], [18], [95], [133], [134]....
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References
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"Performance Analysis of Active Larg..." refers background or result in this paper
...For densely located LISs, all channels will be modeled by device-specific spatially correlated Rician fading depending on the distance between each LIS and device, however, the massive MIMO works in [20]–[22] rely on a Rayleigh fading channel considering far-field communications....
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...In large antenna-array systems such as massive MIMO and LIS, the performance can be dominantly limited by residual interference from pilot contamination as explained in [20]–[22]....
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...Moreover, in LIS, each area of the large surface constitutes one of the key parameters that determine the performance of an LIS system [9]–[11], however, in existing massive MIMO works [20]–[22], this notion of an area is not applicable....
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...Since LISs will be located more densely than BSs, the LIS channels associated with pilot contamination will be significantly different than those of massive MIMO, and hence, prior studies on pilot contamination for massive MIMO [20]–[22] do not directly apply to LIS....
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...In fact, prior studies on massive MIMO [20]–[22] do not directly apply to LIS, because the channel model of LIS is significantly different from the one used in these prior studies....
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4,096 citations
"Performance Analysis of Active Larg..." refers methods in this paper
...Under the imperfect CSI results from an LS estimator, fnk can be obtained from (8) as fnk = h L nnkk + enk where enk is the estimation error vector uncorrelated with nnk [30]....
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3,045 citations