Changes between Version 30 and Version 31 of Tutorials/k0SDR/Tutorial25

Timestamp:

Nov 22, 2017, 7:33:38 PM (7 years ago)

Author:

tingjunchen

Comment:

—

Tutorials/k0SDR/Tutorial25

@@ -16 +16 @@
 
 === Hardware / Software Resources Utilized ===
-1. USRP N210 with node11-10 in the ORBIT main grid
-2. [http://www.xdimax.com/sub20/sub20.html SUB-20] is a multi-interface USB adapter for providing popular interfaces between PC (USB host) and different hardware devices. Specifically, we use the SUB-20 SPI module to control and configure the Gen-1 RF canceller (see Fig. 1(a)). The user manual can be found [http://www.xdimax.com/sub20/doc/sub20-man.pdf here].
-3. [https://github.com/EttusResearch/uhd, UHD] is already installed with the imaged SDR node.
-4. The {{{Eigen C++}}} Library is used for basic algebra used in channel estimation and digital self-interference cancellation. The Eigen releases can be found on the [http://eigen.tuxfamily.org/index.php?title=Main_Page this website]. We used the latest stable release Eigen 3.3.4 through our testings and experiments.
+1. The Columbia FlexICoN Gen-1 RF Canceller, which is a frequency-flat amplitude- and phase-based RF canceller implemented using discrete components on a PCB. The Gen-1 RF canceller is optimized to have a center operating frequency at 900MHz.
+2. USRP N210 with node11-10 in the ORBIT main grid.
+3. [http://www.xdimax.com/sub20/sub20.html SUB-20] is a multi-interface USB adapter for providing popular interfaces between PC (USB host) and different hardware devices. Specifically, we use the SUB-20 SPI module to control and configure the Gen-1 RF canceller (see Fig. 1(a)). The user manual can be found [http://www.xdimax.com/sub20/doc/sub20-man.pdf here].
+4. [https://github.com/EttusResearch/uhd, UHD] is already installed with the imaged SDR node.
+5. The {{{Eigen C++}}} Library is used for basic algebra used in channel estimation and digital self-interference cancellation. The Eigen releases can be found on the [http://eigen.tuxfamily.org/index.php?title=Main_Page this website]. We used the latest stable release Eigen 3.3.4 through our testings and experiments.
 
 All the source code is also publicly available at [https://github.com/Wimnet/flexicon_orbit here].
@@ -51 +52 @@
 ./fd_transceiver_simple --tx-args="serial=F331D4" --rx-args="serial=F331D4" --rate 1e6 --freq 900e6 --tx-gain 10 --rx-gain 10
 }}}
- The default sine wave has an amplitude {{{ampl = 0.3}}} and wave frequency {{{wave-freq = 100e3}}} (100kHz). This terminal window will show the power level at RX baseband, after RF cancellation (before digital) and after digital cancellation, respetively.
+ The default sine wave has an amplitude {{{ampl = 0.3}}} and wave frequency of 100kHz {{{wave-freq = 100e3}}}. This terminal window will show the power level at RX baseband, after RF cancellation (before digital) and after digital cancellation, respetively.
 
 ==== In Terminal 2 (SUB-20) ====
@@ -66 +67 @@
  In particular, the {{{ATT = 0, 1, 2, ..., 127}}} and {{{PS = 0, 1, 2, ..., 255}}} codes are for configuring the 7-bit attenuator and 8-bit phase shifter of the Gen-1 RF canceller. It is recommended to use {{{C1 = 16, C2 = 3, C3 = 9}}}. You can play with the values of {{{ATT}}} and {{{PS}}} until you see good cancellation profile (e.g., low residual self-interference power level) in Terminal 1.
 
+==== A Secondary Transmitter Using Node13-8 ====
+Once the full-duplex node11-10 is up and running, you can turn on another SDR to transmit to the full-duplex node. Below, we use {{{node13-8}}} as an example in the 3rd terminal window (Terminal 3).
+ * Load image, power on, and login into node13-8:
+{{{
+omf tell -a offh -t node13-8
+omf load -i baseline-sdr.ndz -t node13-8
+omf tell -a on -t node13-8
+ssh root@node13-8
+}}}
+ * Configure the USRP Ethernet interface: {{{ifconfig eth2 192.168.10.1 netmask 255.255.255.0 up}}}
+ * Set up a secondary transmitter sending a sine wave at a different frequency (e.g., 200kHz) than that of the full-duplex node:
+{{{
+./tx_waveforms --args="serial=F331D4" --rate 1e6 --freq 900e6 gain 10 --wave-type SINE --wave-freq 200e3
+}}}
+ Now