February 2026 | Journal Article
Adjacent Channel Interference Analysis From U-NII-4 and U-NII-5 Devices Into 5G NR V2X Devices
Cite This Publication
Mustafa Harun Yılmaz, “Adjacent Channel Interference Analysis From U-NII-4 and U-NII-5 Devices Into 5G NR V2X Devices,” IEEE Communications Letters 30 (February 2026): 1031–1035. https://doi.org/https://doi.org/10.1109/LCOMM.2026.3660155
Mustafa Harun Yılmaz 
Abstract:
The Federal Communications Commission in the U.S. assigned 30 MHz from the 5895–5925 MHz band for vehicular communication. Adjacent bands, i.e., from 5850–5895 MHz and 5925–6425 MHz, were designated for unlicensed devices. In this study, the effect of adjacent channel interference (ACI) from unlicensed devices into 5G new radio (NR) vehicle-to-everything (V2X) devices was investigated at the link and system level simulations. After conducting link level analysis, a downtown congested traffic scenario with 330 vehicles was considered at the system level. An unlicensed device was assumed to operate using either IEEE 802.11ac or 802.11ax standard. At the link level, only the ACI from a U-NII-4 device degrades the performance of 5G NR V2X devices. At the system level, the ACI from U-NII-4 device with 90% duty cycle degrades the performance by 2.5 dB while for all other cases, a single unlicensed device does not affect the 5G NR V2X performance because it is obscured by the interference from the other 5G NR V2X devices using the same subchannels.
For technical information concerning this report, contact:
Mustafa Harun Yılmaz
Institute for Telecommunication Sciences
For funding information concerning this report, click this link.
Funding Information
Performing Agency
U.S. Department of Commerce
National Telecommunications and Information Administration
Institute for Telecommunication Sciences
325 Broadway
Boulder, CO 80305
https://ror.org/00mj5bc69
Funding Agency
U.S. Department of Transportation
1200 New Jersey Avenue, S.E.
Washington, D.C. 20590
https://ror.org/02xfw2e90
Disclaimer:
Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.
For questions or information on this or any other NTIA scientific publication, contact the ITS Publications Office at ITSinfo@ntia.gov or 303-497-3572.