Программно-определяемые радиоприемники USRP: Обзор семейства устройств

Product family of software defined radios

Universal Software Radio Peripheral (USRP) is a range of software defined radios designed and sold by Ettus Research and its parent company, National Instruments. Developed by a team led by Matt Ettus, the USRP product family is commonly used by research labs, universities, and hobbyists. Most USRPs connect to a host computer through a high speed link, which the host based software uses to control the USRP hardware and transmit/receive data. Some USRP models also integrate the general functionality of a host computer with an embedded processor that allows the USRP device to operate in a stand alone fashion. The USRP family was designed for accessibility, and many of the products are open source hardware. The board schematics for select USRP models are freely available for download; all USRP products are controlled with the open source UHD driver, which is free and open source software. USRPs are commonly used with the GNU Radio software suite to create complex software defined radio systems.

The USRP product family includes a variety of models that use a similar architecture. A motherboard provides the following subsystems: clock generation and synchronization, FPGA, ADCs, DACs, host processor interface, and power regulation. These are the basic components that are required for baseband processing of signals. A modular front end, called a daughterboard, is used for analog operations such as up/down conversion, filtering, and other signal conditioning. This modularity permits the USRP to serve applications that operate between DC and 6 GHz. In stock configuration the FPGA performs several DSP operations, which ultimately provide translation from real signals in the analog domain to lower rate, complex, baseband signals in the digital domain. In most use cases, these complex samples are transferred to/from applications running on a host processor, which perform DSP operations. The code for the FPGA is open source and can be modified to allow high speed, low latency operations to occur in the FPGA.

The USRP N200 and USRP N210 are high performance USRP devices that provide higher dynamic range and higher bandwidth than the bus series. Using a Gigabit Ethernet interface, the devices in the Networked Series can transfer up to 50 MS/s of complex, baseband samples to/from the host. This series uses a dual, 14 bit, 100 MS/s ADC and dual 16 bit, 400 MS/s DAC. This series also provides a MIMO expansion port which can be used to synchronize two devices from this series. This is the recommended solution for MIMO systems. The X300 and X310 are third generation USRPs that feature two full duplex daughterboard slots and feature full 200 MS/s DACs and ADCs. As network interface, 10GBase over SFP+ allows full 200 MS/s on both channels in full duplex operation. The N300, N310, N320 and N321 are current dual channel models offering SFP+ connectivity, up to 200 MS/s and optionally sharing of local oscillators and TPM modules for verifiable software deployments.

All products in Ettus Research Bus Series use a USB 2.0 or USB 3.0 interface to transfer samples to and from the host computer.

The Embedded Series combines the same functionality of other USRP devices with an OMAP 3 embedded processor. The E310, released in November 2014, utilizes the Zynq SoC platform and the Analog Devices AD9361 RFIC for a very compact, embedded USRP. The devices in this family do not need to be connected to an external PC for operation. The Embedded Series is designed for applications that require stand alone operation.

The USRP2 was developed after the USRP and was first made available in September 2008. It has reached end of life and has been replaced by the USRP N200 and USRP N210. The USRP2 was not intended to replace the original USRP, which continued to be sold in parallel to the USRP2. This first generation USRP is also no longer available publicly. The E100 series of embedded USRPs is no longer available.