USRP-N300

The USRP N300 is a high-performance networked software-defined radio (SDR) platform developed by Ettus Research. Designed for distributed wireless systems, remote RF deployment, radar research, and advanced communication applications, the USRP N300 combines powerful FPGA processing, embedded ARM computing, and high-speed Ethernet connectivity in a compact and scalable architecture.

Unlike the PCIe-based USRP X310, the N300 focuses on network-based SDR deployment, making it ideal for large-scale distributed systems and remote operation environments.

Typical applications include:

• 4G/5G wireless prototyping
• Distributed MIMO systems
• Radar development
• Spectrum monitoring
• RF sensing
• Academic wireless research
• Industrial wireless systems
• Remote RF deployment

System Architecture

The USRP N300 integrates:

• Embedded ARM processor
• Xilinx Zynq-7100 SoC FPGA
• Dual RF channels
• High-speed network interfaces
• GPS synchronization support
• Remote deployment capability

Key specifications:

This architecture allows the N300 to operate as a standalone SDR node or as part of a distributed RF system.

Networked SDR Deployment

The biggest advantage of the USRP N300 is its network-based architecture.

Benefits include:

Remote Operation

Deploy SDR systems far away from the host PC.

Scalable Infrastructure

Multiple N300 units can be deployed over Ethernet.

Distributed RF Systems

Ideal for geographically separated radio systems.

Centralized Control

Manage multiple SDRs from one control server.

Applications include:

• Cellular testbeds
• Distributed radar
• Spectrum surveillance
• Smart city RF sensing

Compared with the X310, the N300 provides much greater deployment flexibility.

FPGA and Embedded Processing

The USRP N300 uses the Xilinx Zynq-7100 SoC.

This combines:

• FPGA fabric
• Embedded ARM processor

Engineers can implement:

Custom DSP Pipelines

Run filters, decoders, and modulation directly in hardware.

Embedded RF Processing

Reduce data transport requirements.

Edge Analytics

Perform local signal classification.

Protocol Offloading

Handle timing-sensitive wireless protocols.

This makes the N300 efficient in systems where bandwidth between host and radio is limited.

Wireless Research Applications

The N300 is widely used in wireless R&D.

Typical applications:

LTE Development

Build and test LTE base stations.

5G Prototyping

Develop sub-6 GHz radio systems.

Open RAN

Integrate with open-source stacks like srsRAN and OpenAirInterface.

Massive MIMO Testbeds

Synchronize multiple N300 devices.

Channel Sounding

Study propagation in real-world environments.

Its networked deployment model makes it ideal for university labs and telecom testbeds.

Radar and RF Sensing

The USRP N300 is also used in radar applications.

Common use cases:

FMCW Radar

Generate and process radar chirps.

Passive Radar

Use multiple synchronized receivers.

Spectrum Monitoring

Deploy remote RF monitoring stations.

RF Localization

Perform distributed signal triangulation.

Because multiple N300s can be synchronized, it is useful for distributed sensing systems.

Synchronization and Timing

The N300 supports:

• GPSDO
• PPS
• 10 MHz reference
• MIMO synchronization

This enables:

• Phase-coherent operation
• Distributed MIMO systems
• Radar arrays
• Timing-sensitive communication systems

For multi-node RF deployments, synchronization is a critical advantage.

Comparison with Similar USRP Models

Compared with the X310, the N300 is better for network deployment. Compared with the N320/N321, the N300 offers lower bandwidth but lower system cost.

Why Engineers Choose USRP N300

Engineers choose the N300 for:

• Network-based deployment
• Distributed RF systems
• Embedded FPGA processing
• Remote operation
• Scalable multi-node systems
• Wireless research
• Radar applications
• Spectrum sensing

It is particularly useful when physical radio placement matters.

Conclusion

The USRP N300 is a powerful and flexible networked SDR platform for distributed RF applications.

Its combination of:

• 2×2 MIMO
• Up to 100 MHz bandwidth
• Xilinx Zynq-7100 FPGA
• Embedded ARM processing
• Ethernet-based deployment
• GPS synchronization
• UHD software ecosystem

makes it an excellent solution for wireless research, radar systems, distributed sensing, and scalable RF infrastructure.