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C-RAN Zero-Forcing with Imperfect CSI: Analysis and Precode&Quantize Feedback
[article]
2021
arXiv
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The first is a new upper bound on the rate loss, which implies a lower bound on the achievable rate, obtained by a cluster of RRHs that employ joint zero-forcing (ZF) with incomplete CSI. ...
This method requires global channel state information (CSI) at the processing unit that designs the joint precoder. To this end, a large amount of CSI must be shared between the RRHs and that unit. ...
DOWNLINK CRAN-JT: PERFORMANCE ANALYSIS FOR ZF WITH IMPERFECT CSI This section introduces a new upper bound on the throughput degradation under limited CSI compared to perfect CSI. ...
arXiv:2012.12551v2
fatcat:6deehjqiorhdfesqrs47atagu4
Optimized Precoding for MU-MIMO With Fronthaul Quantization
[article]
2022
arXiv
pre-print
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We consider both perfect and imperfect channel state information. ...
We study optimized linear precoding for AAS with a limited-capacity fronthaul, which requires the precoding matrix to be quantized. ...
Imperfect CSI The BBU uses its available CSI to select the downlink precoding matrix. The CSI can be represented by the channel matrix estimate Ĥ ∈ C K×M with entries ĥk,m . ...
arXiv:2209.01868v1
fatcat:zp4zfd2vqrd35ohppvzuht6ayy
Recent Advances in Cloud Radio Access Networks: System Architectures, Key Techniques, and Open Issues
[article]
2016
arXiv
pre-print
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Motivated by its significant theoretical performance gains and potential advantages, C-RANs have been advocated by both the industry and research community. ...
This paper comprehensively surveys the recent advances of C-RANs, including system architectures, key techniques, and open issues. ...
In downnlink, the zero-forcing beamforming strategy with scalar fixed quantization can be first used. ...
arXiv:1604.00607v1
fatcat:ioc5tcuddncxnpign2ifzezyn4
Achieving Vanishing Rate Loss in Decentralized Network MIMO
[article]
2019
arXiv
pre-print
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In this paper, we considerably strengthen the previous intriguing DoF result by showing that it is possible to achieve asymptotically the same sum rate as that attained by Zero-Forcing (ZF) precoding in ...
a centralized setting endowed with the best-quality CSI. ...
Centralized Zero-Forcing Precoding We restrict this work to ZF precoding schemes, which are known to achieve the optimal DoF in the centralized CSIT setting [1] , [2] and that allow for analytical tractability ...
arXiv:1901.06849v2
fatcat:7kca3ikrvjhy3kgqlncsfrrswu
Reducing Complexity in Next-Generation MU-MIMO Systems
[article]
2015
arXiv
pre-print
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the channel state information / user data feedback requirements of multi-user multi-antenna wireless networks. ...
antenna array and wish to send data to their respective single-antenna user terminals, while co-existing in time and frequency. ...
In the future, we plan to extend this work by studying larger setups and cases with imperfect CSI feedback. ...
arXiv:1507.04050v1
fatcat:tefhmk6wybbo7okkmdclvd3g3a
On the Degrees-of-Freedom of the K-user Distributed Broadcast Channel
[article]
2020
arXiv
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The performance is studied when the TXs are faced with a distributed Channel State Information (CSI) configuration in which each TX has access to its own multi-user imperfect channel estimate based on ...
Interestingly, the optimal DoF in the Weak-CSIT regime only depends on the CSI quality at the best informed TX and not on the CSI quality at all other TXs. ...
the CSI sharing from the main TX to the remote radio heads is done using limited and imperfect communication links, as illustrated in Fig. 1 .c. ...
arXiv:1601.07399v6
fatcat:hq7hpr6tg5dt7frhbjdwqtyrqy
Robust Regularized ZF in Cooperative Broadcast Channel under Distributed CSIT
[article]
2017
arXiv
pre-print
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We consider the family of JP-CoMP precoders known as regularized zero-forcing (RZF). ...
Our analysis confirms the improved robustness of the proposed scheme with respect to CSI inconsistency at different TXs, even with moderate number of antennas and receivers (RXs). ...
Regularized Zero Forcing with Distributed CSI We consider in this work the analysis of RZF precoder [15] , [24] , when faced with CSIT inconsistencies in the large system regime. ...
arXiv:1702.02034v1
fatcat:lu5zeg45v5ew3f7nen66usyvoa
Machine Learning Inspired Hybrid Precoding for Wideband Millimeter-Wave Massive MIMO Systems
2019
IEEE Access
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Specifically, we provide the energy consumption analysis to reveal the fact that the energy consumed by the one-bit PSs is much lower than that by the HR-PSs, and the array gain loss incurred by using ...
Furthermore, we extend the proposed CEO-based hybrid precoding scheme from the case with one-bit PSs to the general case with HR-PSs to show that our solution can also be applied in other scenarios. ...
We consider a perfect CSI case and several imperfect CSI cases with different values of ξ . The proposed CEO-based hybrid precoding with one-bit PSs is not sensitive to CSI accuracy. ...
doi:10.1109/access.2019.2916883
fatcat:fspixhgagfhr5iavaqatlrpdpm
Rate Analysis of Two-Receiver MISO Broadcast Channel with Finite Rate Feedback: A Rate-Splitting Approach
[article]
2015
arXiv
pre-print
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has been proposed recently, which divides one receiver's message into a common and a private part, and superposes the common message on top of Zero-Forcing precoded private messages. ...
Firstly, we upper-bound the sum rate loss incurred by each scheme relative to Zero-Forcing Beamforming (ZFBF) with perfect CSIT. ...
McKay, “Tomlinson Harashima Precoding for multiuser
ln 2 2 4 2 4 MIMO systems with quantized CSI feedback and user scheduling ...
arXiv:1506.09023v1
fatcat:eytkkcylhjc4tmecz5oph72hby
Advances in MIMO Techniques for Mobile Communications—A Survey
2010
International Journal of Communications, Network and System Sciences
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Both open-loop and closed-loop SU-MIMO systems are discussed in this paper with particular emphasis on the data rate maximization aspect of MIMO. ...
A detailed review of various MU-MIMO uplink and downlink techniques then follows, clarifying the underlying concepts and emphasizing the importance of MU-MIMO in cellular communication systems. ...
H GMD MIMO can be implemented with the V-BLAST receiver and also with the zero-forcing dirty paper precoder (ZFDP). The V-BLAST technique has been discussed earlier in the text. ...
doi:10.4236/ijcns.2010.33031
fatcat:wyhhqdwt5nablim2rvqij2osju
Rate-Splitting Multiple Access: Fundamentals, Survey, and Future Research Trends
[article]
2022
arXiv
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Furthermore, it enjoys a higher robustness against imperfect channel state information at the transmitter (CSIT) and entails lower feedback overhead and complexity. ...
, as well as comparing with existing MA schemes in terms of their overall frameworks, performance, and complexities. ...
Based on the system model of 1-layer RS, the precoding matrix P = [p c , p 1 , . . . , p K ] ∈ C M×(K+1) can be designed as low-complexity precoding, such as zero-forcing beamforming (ZFBF) for the private ...
arXiv:2201.03192v2
fatcat:z3ujjbqwxzc5dbgu3ganoqomae
Rate-Splitting Multiple Access: A New Frontier for the PHY Layer of 6G
[article]
2020
arXiv
pre-print
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and QoS enhancements, robustness to imperfect Channel State Information at the Transmitter (CSIT), and complexity reduction. ...
In order to efficiently cope with the high throughput, reliability, heterogeneity of Quality-of-Service (QoS), and massive connectivity requirements of future 6G multi-antenna wireless networks, multiple ...
A more specific study on the finite rate CSI feedback [14] shows that RSMA enables a quantized CSIT feedback overhead reduction over SDMA with Zero Forcing Beamforming (ZFBF). ...
arXiv:2006.01437v3
fatcat:odfj5rdulfgwdo4m7pqabbwp5u
Joint User Selection, Power Allocation, and Precoding Design with Imperfect CSIT for Multi-Cell MU-MIMO Downlink Systems
[article]
2019
arXiv
pre-print
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System-level simulations show the gains of the proposed approach with respect to conventional user selection and linear downlink precoding. ...
The GPIP is also extended to a multi-cell scenario, where cooperative base stations perform joint user selection and design their precoding vectors by sharing global yet imperfect CSIT within the cooperative ...
In frequency division duplex (FDD) systems, imperfect CSI can be obtained via downlink training and feedback, and its accuracy is determined by the feedback rate and by the delay introduced by the probing ...
arXiv:1902.00824v1
fatcat:fn3zbfl3f5dynl366hijqowxoi
A Survey on Hybrid Beamforming Techniques in 5G: Architecture and System Model Perspectives
2018
IEEE Communications Surveys and Tutorials
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with the possible antenna configuration scenarios and the hybrid beamforming in heterogeneous wireless networks (HetNET). ...
This hybrid beamforming design reduces the cost and power consumption which is aligned with an energyefficient design vision of 5G. ...
enabling strategy, and BS-switching techniques in cloud-RAN (C-RAN)/heterogeneous C-RAN in tabular forms. ...
doi:10.1109/comst.2018.2843719
fatcat:v7kmfmaxrfeeti7hcwsjjf5fda
Resource Allocation Optimization for Delay-Sensitive Traffic in Fronthaul Constrained Cloud Radio Access Networks
[article]
2014
arXiv
pre-print
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The cloud radio access network (C-RAN) provides high spectral and energy efficiency performances, low expenditures and intelligent centralized system structures to operators, which has attracted intense ...
In this paper, a hybrid coordinated multi-point transmission (H-CoMP) scheme is designed for the downlink transmission in C-RANs, which fulfills the flexible tradeoff between cooperation gain and fronthaul ...
or quantization errors and feedback latency in frequency division duplex (FDD) systems. ...
arXiv:1410.7867v1
fatcat:lqhe7zfmfjacvl7w7b4vimlg74
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