Abstract
This paper presents a hybrid beamforming design for millimeter-wave (mmWave) orthogonal frequency division multiplexing (OFDM) distributed antenna systems (DASs). First, we derive a downlink signal transmission model that considers the delay spread differences (DSDs) caused by the distributed nature of the network. We then propose a cooperative wideband hybrid beamforming method under the transmitting power constraints of each remote access unit. In a simulation study, the proposed method performed comparably to fully-digital beamforming, even when operated with practical finite-resolution phase shifters. We further confirm that the DSDs are the dominant cause of performance degradation in mmWave OFDM DASs.
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Acknowledgements
This work was supported in part by National Key Research and Development Program (Grant No. 2018YFE0205902), National Natural Science Foundation of China (NSFC) (Grant Nos. 61871122, 61971127), and Six Talent Peaks Project in Jiangsu Province.
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Appendixes A and B. The supporting information is available online at info.scichina.com and link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.
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Zhang, Y., Wang, D., Huo, Y. et al. Hybrid beamforming design for mmWave OFDM distributed antenna systems. Sci. China Inf. Sci. 63, 192301 (2020). https://doi.org/10.1007/s11432-019-2799-y
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DOI: https://doi.org/10.1007/s11432-019-2799-y