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• W2950583953 abstract "Massive MIMO has been regarded as one of the key technologies for 5G wireless networks, as it can significantly improve both the spectral efficiency and energy efficiency. The availability of high-dimensional channel side information (CSI) is critical for its promised performance gains, but the overhead of acquiring CSI may potentially deplete the available radio resources. Fortunately, it has recently been discovered that harnessing various sparsity structures in massive MIMO channels can lead to significant overhead reduction, and thus improve the system performance. This paper presents and discusses the use of sparsity-inspired CSI acquisition techniques for massive MIMO, as well as the underlying mathematical theory. Sparsity-inspired approaches for both frequency-division duplexing and time-division duplexing massive MIMO systems will be examined and compared from an overall system perspective, including the design trade-offs between the two duplexing modes, computational complexity of acquisition algorithms, and applicability of sparsity structures. Meanwhile, some future prospects for research on high-dimensional CSI acquisition to meet practical demands will be identified." @default.
• W2950583953 created "2019-06-27" @default.
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• W2950583953 date "2015-05-03" @default.
• W2950583953 modified "2023-10-01" @default.
• W2950583953 title "High-Dimensional CSI Acquisition in Massive MIMO: Sparsity-Inspired Approaches" @default.
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• W2950583953 doi "https://doi.org/10.48550/arxiv.1505.00426" @default.
• W2950583953 hasPublicationYear "2015" @default.
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