Software Defined Radio
Overview
This example demonstrates RF record and playback using the NI USRP™ tranceiver.
Description
For complete description and details for the following example, check out this white paper:
http://www.ni.com/white-paper/13881/en/
Steps to Implement or Execute Code:
1. Open Record.gvi and navigate to the front panel
2. Populate the front panel controls as follows:
- Configure a file path for the recorded signal
- Enter the IP address of your USRP device (typically 192.168.10.2)
- Set the Carrier Frequency, IQ Rate, and Gain for the signal you'd like to acquire
- Ensure the proper antenna is selected
3. Run the VI to record a signal with the configured settings
In our demonstration using a handheld two-way radio, the parameters were configured and input was observed/recorded as shown in Figure 1:
Figure 1: Front panel parameters for recording of two-way radio
NOTE: Be sure to observe the coerced values so that you know exactly what parameters were used for the recording
4. Open Playback.gvi and navigate to the front panel
5. Populate the front panel controls with the File Path to the previously recorded binary file, as well as the Carrier Frequency, IQ Rate, and Gain used previously (assuming you're playing back to the same device you recorded from)
6. Run the VI to playback the recorded signal with the configured settings
The parameters were configured as shown in Figure 2 for playback of the two-way radio signal recorded for this demonstration:
Figure 2: Front panel parameters for playback of recorded two-way radio signal
Requirements
Software
- LabVIEW Communications System Design Software 1.0+
Hardware
- USRP-292x, USRP-293x, USRP-294x, or USRP-295x
- Device to generate RF signal you wish to record and playback (like a two-way radio)
Additional Images or Video
See the full Record and Playback tutorial for LabVIEW 2014: http://zone.ni.com/devzone/cda/tut/p/id/13881
LabVIEW 2014 version of this example is available here.
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