Changes between Version 1 and Version 2 of Tutorials/k0SDR/Tutorial28

Timestamp:

Oct 8, 2019, 3:30:59 PM (5 years ago)

Author:

prasanthi

Comment:

—

Tutorials/k0SDR/Tutorial28

@@ -1 +1 @@
 == Wideband Channel Sounding with USRP X310s == 
+
+=== Description ===
+This tutorial shows how to use the RFNoC Correlator block(CE) for channel sounding. This experiment is conducted using USRP X310s on ORBIT grid.
+
+=== Set Up ===
+Make a reservation on the [https://www.orbit-lab.org/schedule/ Orbit Scheduler] for using the grid.
+==== Prepare Receive Node ====
+* Load channel_sounder_x310.ndz on an ORBIT node. 
+{{{
+prasanthi@console.grid:~$ omf load -i channel_sounder_x310.ndz -t node1-19
+}}}
+* Once imaging is done, turn the node on and log in
+{{{
+prasanthi@console.grid:~$ omf tell -a on -t node1-19
+prasanthi@console.grid:~$ ssh root@node1-19
+}}}
+
+==== Prepare Receive USRPs ====
+* Pick USRP X310s from the MIMO racks 23-1...8, 23-11...18, 24-1...8, 24-11...18 and load correlator FPGA image on them. The USRPs are programmed one at a time.
+{{{
+root@node1-19:~# uhd_image_loader --args="addr=10.10.24.12" --fpga-path="/root/bit/corrmag63avg8k_v2_8_7.bit"
+}}}
+* Power cycle USRPs so that the new FPGA image is active
+{{{
+prasanthi@console.grid:~$ omf tell -a offh -t node24-12,node24-13
+prasanthi@console.grid:~$ omf tell -a on -t node24-12,node24-13
+}}}
+* Running uhd_usrp_probe on the X310s with spectrum sensing FPGA image should give the following
+{{{
+|   |    /
+|   |   |       RFNoC blocks on this device:
+|   |   |
+|   |   |   * DmaFIFO_0
+|   |   |   * Radio_0
+|   |   |   * Radio_1
+|   |   |   * DDC_0
+|   |   |   * DUC_0
+|   |   |   * Corrmag63avg8k_0
+|   |   |   * FIFO_0
+
+}}}
+==== Prepare Transmit Node ====
+A spectrum spreader RFNoC block is being used to generate wideband PN signal.
+* Load prasanthi-channel-sounder.ndz on an ORBIT node.
+{{{
+prasanthi@console.grid:~$ omf load -i prasanthi-channel-sounder.ndz -t node14-20
+}}}
+* Once imaging is done, turn the node on and log in 
+{{{
+prasanthi@console.grid:~$ omf tell -a on -t node14-20
+prasanthi@console.grid:~$ ssh root@node14-20
+}}}
+
+==== Prepare Transmit USRP ====
+* Pick a USRP X310 for transmitting, and load the spectrum spreader FPGA image
+{{{
+root@node1-20:~# uhd_image_loader --args="addr=10.10.24.11" --fpga-path="/root/bit/x310_spreader_4_28.bit"
+}}}
+* Power cycle the USRP so that the new FPGA image is active
+{{{
+prasanthi@console.grid:~$ omf tell -a offh -t node24-11
+prasanthi@console.grid:~$ omf tell -a on -t node24-11
+}}}
+* Running uhd_usrp_probe on the X310 with spectrum spreader FPGA image should give the following
+{{{
+|   |     _____________________________________________________
+|   |    /
+|   |   |       RFNoC blocks on this device:
+|   |   |
+|   |   |   * DmaFIFO_0
+|   |   |   * Radio_0
+|   |   |   * Radio_1
+|   |   |   * DUC_0
+|   |   |   * Spreader_0
+|   |   |   * FIFO_0
+|   |   |   * FIFO_1
+}}}
+==== Set up SSH tunnel from your local port 5100 to grid.orbit-lab.org:5100 ====
+{{{
+ssh -L 5100:grid.orbit-lab.org:5100 username@grid.orbit-lab.org
+}}}
+==== Set up a web proxy for the receive node ====
+Use run-websock command to set up the proxy (this is required for remote web based streaming)
+{{{
+prasanthi@console.grid:~$ run-websock 5100 10.10.1.19:5100 --daemon
+WARNING: no 'numpy' module, HyBi protocol will be slower
+WebSocket server settings:
+  - Listen on :5100
+  - Flash security policy server
+  - No SSL/TLS support (no cert file)
+  - Backgrounding (daemon)
+}}}
+=== Run the experiment ===
+* Run rfnoc_spec_sense_display on the receive node. The command below starts the application to receive spectrum sensing samples from 4 USRP X310s at 100MSPS.
+{{{
+root@node1-19:~/uhd/host/build/examples# ./rfnoc_spec_sense_display --args="addr0=10.10.23.11,addr1=10.10.23.12,addr2=10.10.23.13,addr3=10.10.23.14,skip_ddc,skip_duc" --freq 5e9 --gain 15 --ddc-args="input_rate=200000000.0,output_rate=100000000.0" --num-usrp 4 --spec-sense-args="avg_size=256"
+}}}
+* Run rfnoc_spreader on the transmit node. The command below starts the application to send a 50MHz wide PN signal on node23-17.
+{{{
+root@node1-20:~/uhd/host/build/examples# ./rfnoc_spreader --args="addr=10.10.23.17,skip_ddc,skip_duc" --freq 5e9 --gain 15 --duc-args="input_rate=50000000.0,output_rate=200000000.0"
+}}}
+* Download spec_sense_display.html and open it in your browser. Once you click the Start button, you should see power spectrum display as shown below.
+
+    || [[Image(spec_sense_display.jpg)]]||
+
+
+