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Enhancing Multi-RAT Coexistence in Unlicensed mmWave Bands Using Hybrid-Beamforming



Susanna Mosleh, Yao Ma, Jason Coder


The radio spectrum is becoming an increasingly scarce and valuable resource to such an extent that sharing the unlicensed bands is inevitable. In this work, we consider a multicell, multi-user massive multiple-input multiple-output (MIMO) coexistence scenario where multiple 5G New Radio Unlicensed (NR-U) and Wireless Gigabit (WiGig) links share an unlicensed millimeter-wave band. Our aim is to enhance the performance of coexisting networks by maximizing the overall network throughput via hybrid beamforming. This throughput is a function of both operators' medium access control protocols and physical layer parameters. We propose a novel hidden node aware hybrid beamforming design. The hybrid precoders and combiners are optimal in the sense that they simultaneously maximize the signal power at the desired users while minimizing the received intercell and intra-cell intereferences at the undesired users (leakage). The performance of the proposed scheme is examined through simulations. A comparison among the proposed method, a beamsteering solution, and an optimal unconstrained precoding design indicates the efficiency of the proposed algorithm.
Proceedings Title
IEEE Global Communications Conference
Conference Dates
December 7-11, 2021
Conference Location
Madrid, ES


5G, beamforming, coexistence, hidden nodes, mmWave frequencies, MAC layer, NR-U, physical layer, spectrum sharing, WiGig


Mosleh, S. , Ma, Y. and Coder, J. (2022), Enhancing Multi-RAT Coexistence in Unlicensed mmWave Bands Using Hybrid-Beamforming, IEEE Global Communications Conference, Madrid, ES, [online],, (Accessed May 29, 2024)


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Created February 2, 2022, Updated November 29, 2022