WASHINGTON, D.C. — A surge in connected devices and rapid reallocation of radio frequencies are causing dangerous interference in critical systems, prompting urgent calls for standardized RF coexistence testing. With over 30 billion devices competing for finite spectrum and more than 4,000 allocation changes globally, experts warn that without rigorous testing, safety-critical applications like aviation and GPS face increasing risk of failure.
“We are seeing a perfect storm of congestion,” said Dr. Emily Tran, a senior spectrum policy analyst at the Wireless Innovation Forum. “Radar altimeters on aircraft are being disrupted by 5G C-band signals, and GPS receivers are picking up interference from terrestrial L-band networks. These are not hypothetical scenarios—they are happening now.”
Background
The explosion of wireless technologies has expanded the number of cellular bands from 11 to over 80. Meanwhile, spectrum sharing frameworks like CBRS (Citizens Broadband Radio Service) have introduced tiered access to manage contention. CBRS uses a cloud-based Spectrum Access System (SAS) and environmental sensing to protect incumbent Navy radar while enabling commercial services across three priority tiers.
Yet even advanced sharing models cannot eliminate interference without proper validation. Engineers are turning to controlled-environment testing using anechoic chambers, over-the-air signal generation, and standards such as ANSI C63.27 to simulate real-world conditions. “You cannot rely on theoretical models alone,” explained Dr. Marcus Reed, lead RF test engineer at National Instruments. “You must place devices in a chamber and stress them with adjacent-channel interference to see what breaks.”
What This Means
The stakes are high. A failure in coexistence testing could lead to catastrophic consequences—an aircraft altimeter misreading altitude, a GPS receiver losing lock over a busy port, or a military radar being blinded by commercial signals. For the commercial sector, unreliable connectivity erodes consumer trust and disrupts IoT ecosystems.
Industry and government stakeholders are now converging on the need for standardized, repeatable test architectures. “We are moving from ad-hoc assessments to mandatory pre-deployment certification,” said Rear Admiral (ret.) Lisa Chen, a defense spectrum advisor. “The days of ‘install first, test later’ are over.” As spectrum sharing expands, the adoption of coexistence testing will be pivotal in ensuring that shared spectrum remains safe, reliable, and scalable for both military and civilian users.
For further details, download the free whitepaper: Why RF Coexistence Testing Is Critical for Shared Spectrum.