Outdoor-to-Indoor 28 GHz mmWave Measurements in the COSMOS Testbed Deployment Area
Video
Team Information
Team Members
Team Lead: Manav Kohli, PhD Student, Electrical Engineering, Columbia Engineering
Faculty Advisor: Gil Zussman, Professor of Electrical Engineering; and Vice Chair, Department of Electrical Engineering, Columbia Engineering
Abstract
5G-and-beyond wireless and mobile networks will utilize the widely available spectrum at millimeter-wave (mmWave) frequencies to achieve significantly increased data rates. However, since mmWave radio signals experience high path loss, especially through building material, the operation of mmWave networks indoors will require precise channel models suitable for a range of indoor deployment sites. In this poster, we report extensive indoor 28 GHz channel measurements in the deployment area of the city-scale PAWR COSMOS testbed in West Harlem in New York City. These include over 18 million power measurements collected from over 1,100 links at four different locations between October 2020 and August 2021. The four different sites include two modern buildings made predominantly of glass and metal and two older buildings constructed mostly from brick and concrete.
From the measurement results, we obtained the 28 GHz channel path gain values and their best fit lines. We also obtained the effective azimuth beamforming gain, which represents the amount of environmental scattering experienced by the wireless signal. Our results demonstrate the expected high additional path loss and high angular spread caused by building penetration, and show differences between the two types of buildings. We also provide an analysis of the capability of an indoor link scenario and show that gigabit data rates are still achievable with typical transmit and receive parameters, which we show with a case study at Hamilton Grange Middle School, West Harlem, NYC.
We believe that these measurement results can inform the deployment of future wireless networks with the goal of providing service to indoor locations, which can often be a challenging scenario. These results can also be used to design and plan the deployment of the IBM 28 GHz phased array antenna modules in the COSMOS testbed, bringing opportunity for further research at higher layers of a mmWave network.
Team Lead Contact
Manav Kohli: mpk2138@columbia.edu
