Spectrum sculpting using reconfigurable OFDM

This shows the power spectral density of a reconfigurable OFDM system created using the CTVR Plastic Project platform.

You may need to click on the resize button to view this properly.

The RF hardware used is the Universal Software Radio Peripheral by Ettus Research LLC (ettus.com). The centre frequency of this transmission is 2.35GHz, which is in one of the test bands licenced by ComReg for cognitive radio & dynamic spectrum access testing by CTVR.

This IFFT size used in this example is 256. The bandwidth of the transmitted OFDM signal is 1MHz. In this video, the number of subcarriers used is dynamically changed from 255 subcarriers (full bandwidth OFDM) right down to zero subcarriers and back again in various contiguous and non-contiguous configurations.

We use this ability to coexist with other spectrum users occupying the same frequency band. By creating nulls in the spectrum, interference to and from other users within these nulls can be minimised. Publications detailing the early experimental outcomes of this work can be found on www.ctvr.ie

For more information, contact:

Keith Nolan, CTVR. keithnolan AT mee.tcd.ie
Paul Sutton, CTVR. suttonpd AT tcd.ie
(replace AT with @)

Category:

Howto & Style

Tags:

• ofdm
• reconfigurable
• radio
• plastic
• project
• usrp

[umarnumair]

can't see clearly. Appreciate to have see it clearly. But, it's cool to understand how it works.

[EmergingNetworks]

A link to a higher resolution version of this video has been sent to you.

[EmergingNetworks]

Hi edywarriors, we don't use GNU radio software. We use our own software radio framework called IRIS.

[umarnumair]

Thanks, I got it. Good work!.