What you will learn about: 

• Why spectrum congestion is a growing challenge, with over 30 billion connected devices, more than 4,000 allocation changes worldwide, and 80 cellular bands.
• How real-world coexistence failures threaten safety-critical systems, including 5G C band interference with aircraft radar altimeters and terrestrial L band networks disrupting GPS receivers not designed for adjacent high-power signals.
• Why tiered spectrum sharing frameworks like CBRS use cloud-based Spectrum Access Systems and environmental sensing to protect incumbent Navy radar while enabling commercial cellular services across three priority tiers.
• How to implement coexistence testing using controlled environments, ANSI C63.27 standards, and cognitive radio systems that use AI and machine learning to optimize spectrum allocation dynamically.

As wireless communications evolve from static spectrum allocations toward dynamic, shared access models, RF coexistence has become a critical engineering challenge. Over 30 billion connected devices now compete for finite spectrum resources. The 2.4 GHz ISM band alone hosts Wi-Fi, Bluetooth, ZigBee, and many other overlapping protocols. Meanwhile, high-value spectrum auctions such as FCC Auction 107 have placed 5G transmitters adjacent to safety-critical systems like aircraft radar altimeters and GPS receivers. These incumbent systems were designed before co-channel interference was a concern. Standards like ANSI C63.27, tiered sharing frameworks like CBRS, and cognitive radio systems using AI and software-defined radios offer practical paths forward. This guide examines these coexistence challenges, reviews real-world interference case studies, and outlines the test architectures needed to evaluate RF device performance under realistic operational conditions.