More Flexibility and Resources with UHD 4.0


UHD 4.0 is a major enhancement to the open source driver for the NI / Ettus Research USRP devices.

Martin Braun gave a preview at GRCon 2019, and we’ve delivered on what we shared and more!
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What is UHD?

The USRP Hardware Driver (UHD) is an open-source, common API across all Universal Software Radio Peripheral (USRP) devices.

What’s New in UHD 4.0?

UHD 4.0 is a major step forward for UHD, delivering many critical bug fixes and features to enable advanced SDR applications today and tomorrow. UHD 4.0 is also one of the most tested releases. As a part of this release, we invested heavily in building up our internal automated test tools so each change that is made goes through rigorous validation before being published to the public repository. The combination gives you an SDR driver that is highly capable and stable.

RFNoC Datapath Architecture Updates

With UHD 4.0, RFNoC has undergone a major overhaul for improved usability, performance, and compatibility with tools like GNU Radio.

Improved Radio Performance
  • Increase channel bandwidth to 250 MSPS and beyond.
  • Flexible bus width to increase throughput.
  • Static routing for lower latency and higher throughput
  • Updates to the NOC shell layer for improved latency and throughput.
FPGA Design Flow Enhancements
  • Ability to scale to a larger number of user-defined blocks.
  • Reduced FPGA resource utilization in many instances.
More Flexibility
  • Architectural flexibility enables users to make more design tradeoffs.
  • Allows the user to balance flexibility, resource utilization, and performance.
Improved User Experience
    • Improved documentation with a full RFNoC Specification
    • Power calibration utility API (requires external calibration reference)
    • Python API enhancements with full Python 3 support.
    • Stability improvements from new automated testing infrastructure.
    • Use embedded series radios without programming the ARM processing with “Network Mode” over the RJ45

We’d love to connect and help you with your SDR application, contact us at [email protected]