AmpliTech and Northeastern University Achieve First Open-Source Massive MIMO O-RAN System with Category B Fronthaul

AmpliTech Group, Inc. and researchers at Northeastern University’s Institute for Intelligent Networked Systems have successfully demonstrated the first open-source prototype of a massive MIMO O-RAN system achieving O-RAN Category B operation in a laboratory environment. The demonstration integrates AmpliTech’s commercial-grade mMIMO Category B radio unit with the OpenAirInterface (OAI) CU/DU stack, marking the first time a full, end-to-end massive MIMO O-RAN system has been assembled entirely from open, interoperable components.

The demonstration combined AmpliTech’s mMIMO O-RAN Category B radio unit with OAI’s CU/DU into a single cohesive, standards-compliant platform. The INSI team showcased hybrid beamforming capabilities with a 2-layer MIMO configuration, demonstrating sustained throughput under mobility conditions with proper beam management. Critically, it validates that AmpliTech’s radio unit, designed for commercial deployment, can operate at full performance within a fully open, multi-vendor stack.

Massive MIMO systems, which use large antenna arrays to serve multiple users simultaneously through spatial multiplexing, have historically required tightly integrated, vendor-specific implementations. This demonstration challenges that assumption by showing that the full stack, from the physical layer up through the RAN control plane, can be assembled from open, interoperable components, with no reliance on proprietary, closed solutions. Category B is the technically demanding fronthaul interface that enables this at massive MIMO scale, and its successful validation here marks a first for open-source RAN.

‘This is a significant step toward making Massive MIMO Open RAN a practical reality rather than a research ambition,’ said Tommaso Melodia, Director of the Institute for Intelligent Networked Systems at Northeastern University. ‘Demonstrating that AmpliTech’s commercial massive MIMO radio integrates seamlessly into a fully open-source stack opens entirely new possibilities for how next-generation networks are designed, deployed, and optimized without locking operators into proprietary ecosystems.’

Irfan Ghauri, Director of Operations at the OpenAirInterface Software Alliance, noted that ‘The O-RAN 7.2 Category B is the interface that truly unlocks massive MIMO at scale, and achieving it with an open-source stack has been a long-standing goal for our community. This demonstration with Northeastern and AmpliTech is exactly the kind of end-to-end validation that turns open-source software from a research tool into a credible foundation for commercial deployment.’

Fawad Maqbool, CEO and CTO of AmpliTech Group, emphasized that ‘This demonstration is a critical milestone for AmpliTech and for the Open RAN ecosystem. Seeing our 64T64R Category B radio operate end-to-end within a fully open-source stack at Northeastern proves that high-capacity massive MIMO and true multi-vendor openness are no longer in tension.’

The INSI team led the system integration, testbed configuration, and validation measurements, providing a reproducible reference implementation that academic and industry researchers can build upon. The open-source nature of the demonstration means the architecture can be studied, replicated, and extended, accelerating adoption across the research and operator communities. The results align with growing momentum around Open RAN and next-generation wireless systems, where flexibility, vendor interoperability, and intelligent control are viewed as essential properties for future 5G and 6G deployments.

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