Radio I/O

Transmit and receive real-world RF signals

When transmitting or receiving real-world RF signals, use I/O properties and techniques to perform single and multichannel I/O, detect lost samples, apply burst mode buffering, and repeatedly transmit a waveform.

Functions

`sdrrx`	Create receiver System object for USRP embedded series radio hardware
`sdrtx`	Create transmitter System object for USRP embedded series radio hardware
`capture`	Capture contiguous RF data using USRP embedded series radio hardware
`designCustomFilter`	Design custom filter for Analog Devices AD9361 RF chip
`info`	Synchronize receiver or transmitter radio settings with radio hardware
`transmitRepeat`	Download waveform signal to radio and repeatedly transmit it over the air

Blocks

E3xx Receiver	Receive data from USRP E3xx radio hardware
E3xx Transmitter	Send data to USRP E3xx radio hardware

Objects

`comm.SDRRxE3xx`	Receive data from USRP E3xx radio hardware
`comm.SDRTxE3xx`	Send data to USRP E3xx radio hardware

Topics

Radio I/O Properties and Techniques

Channel I/O
Overview of available radio channels to send and receive data.
Repeated Waveform Transmitter
Use a transmitter System object™ for repeated signal transmission.
Capture Over-the-Air Signals
Record RF signals for post-capture processing in MATLAB^®.
SDR Receiver Sample Times
Set sample times in receiver blocks or receiver System objects.
Data Frame Lengths
Set data frame length in receiver blocks or receiver System objects.
Detect Underruns and Overruns
Detect underruns and overruns using the lost sample indicator.
Burst Mode
To achieve real time performance, enable burst mode.
Apply Conditional Execution
To determine whether you receive valid data from the radio hardware, apply conditional execution.

Digital Modulation

Transmission of a QPSK Waveform Using USRP E3xx
Transmit QPSK modulated messages onto a carrier with a specified center frequency.
Reception of a QPSK Waveform Using USRP E3xx
Receive and demodulate QPSK modulated messages.
Transmission and Reception of an Image Using WLAN Toolbox and a Single USRP E3xx
Transmit and receive encoded WLAN packets using a single SDR device.

Diagnostics

Frequency Offset Calibration Receiver Using USRP E3xx
Determine frequency offset between SDR devices using a transmitter and a receiver.
Frequency Offset Calibration Transmitter Using USRP Embedded Series
Determine frequency offset between SDR devices using a transmitter and a receiver.

Troubleshooting

Common Problems and Fixes

Resolve issues encountered during installation or while using the I/O mode features of the support package.

Featured Examples

Repeated Transmission of a QPSK Waveform Using USRP E3xx

Continuously transmit QPSK data using the repeated waveform transmitter functionality.

Open Script

Transmission and Reception of an Image Using LTE Toolbox and a Single USRP E3xx

Generate multi-antenna LTE transmission for simultaneous transmit and receive on a single SDR device.

Open Script

Reception of a Tone Signal Using USRP E3xx

Perform a simple loopback of a complex sinusoid signal.

Open Script

Capture RF Data to Baseband File Using E3xx Radio Hardware

Save an FM broadcast signal to a file as baseband samples, read the file, and demodulate the baseband samples.

Open Live Script

Frequency Offset Calibration Using USRP E3xx

Determine frequency offset between SDR devices using a transmitter and a receiver model.

Open Model