Full-Duplex Wireless using USRP N210

Description

In this tutorial, we'll use node11-10 in the main grid (equipped with a USRP N210) to transmit and receive a single frequency over the air to demonstrate full-duplex wireless capability using the Columbia ​FlexICoN's Gen-1 Frequency-Flat Amplitude- and Phase-based RF Canceller. For more information, please read

20. Chen, J. Zhou, N. Grimwood, R. Fogel, J. Marasevic, H. Krishnaswamy, and G. Zussman, “Demo: Full-duplex Wireless based on a Small-Form-Factor Analog Self-Interference Canceller,” in Proc. ACM MobiHoc'16, 2016. ​PDF

We also thank Mahmood Baraani Dasterjerdi and Steven Alfano for their contributions.

Hardware / Software Resources utilized

1. USRP N210 with node11-10 in the ORBIT main grid
2. SUB-20: The SUB-20 is a multi-interface USB adapter for providing popular interfaces between PC (USB host) and different hardware devices. Specifically, we use the SPI module on SUB-20 to control and configure our hardware. The user manual can be found ​here.
3. UHD
4. The Eigen C++ Library: The Eigen C++ library is used for basic algebra in channel estimation and digital self-interference cancellation. The Eigen releases can be found on the ​Eigen website. We used the latest stable release Eigen 3.3.4 through our testings and experiments.

All the source code is publicly available at ​here.

Set up

• Before you can access the testbed, you need to ​make a reservation and get it approved by the reservation service. After receiving the reservation's confirmation (approval) email:

• Login into reserved domain: ssh username@…
• Make sure that the full-duplex node is powered down for loading the desired image: omf tell -a offh -t node11-10
• Load an image on the node: omf load -i orbit-flexicon.ndz -t node11-10
• Turn on the node: omf tell -a on -t node11-10