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Performance analysis of full-duplex densely distributed MIMO with wireless backhaul

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Abstract

In this paper, the spectral efficiency of a full-duplex (FD) densely distributed multi-input multi-output (MIMO) system with wireless backhaul is considered. In-band full-duplex (IBFD) backhauling, in which the backhaul and access transmissions take place on the same spectrum, is exploited for wireless backhauling to enable an efficient spectrum reuse. However, the severe cross-tier interference and cross-link interference reduce the gains of IBFD backhauling. To evaluate the achievable spectral efficiency with imperfect channel state information (CSI), we propose a two-phase channel estimation scheme to estimate the CSI for two wireless links, and the scheme estimates an effective interference CSI between access points (APs) based on beamforming training to perform interference cancelation at APs. Given the estimated CSI, the closed-form expressions of the uplink and downlink achievable rates with maximum ratio transmission beamforming and maximum ratio combining receivers, respectively, are derived with Gamma approximation. Numerical results verify the accuracy of the derived closed-form expressions and the effectiveness of the two-phase channel estimation scheme for interference cancelation. Moreover, compared with half-duplex densely distributed MIMO systems, FD systems with interference cancelation have a better performance.

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Acknowledgements

This work was supported in part by National Key R&D Program of China (Grant No. 2019YFE0113400) and National Natural Science Foundation of China (Grant Nos. 61971127, 61871465, 61871122).

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Authors and Affiliations

  1. National Mobile Communications Research Laboratory, Southeast University, Nanjing, 210096, China

    Ziqian Wan, Qijun Pan, Jiamin Li, Pengcheng Zhu & Dongming Wang

  2. Purple Mountain Laboratories, Nanjing, 211111, China

    Jiamin Li, Pengcheng Zhu & Dongming Wang

Authors
  1. Ziqian Wan
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  2. Qijun Pan
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  3. Jiamin Li
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  4. Pengcheng Zhu
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  5. Dongming Wang
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Corresponding author

Correspondence to Jiamin Li.

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Wan, Z., Pan, Q., Li, J. et al. Performance analysis of full-duplex densely distributed MIMO with wireless backhaul. Sci. China Inf. Sci. 66, 162303 (2023). https://doi.org/10.1007/s11432-022-3616-9

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  • DOI: https://doi.org/10.1007/s11432-022-3616-9

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