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[Discuss-gnuradio] Channel sounding and synchronization of continuous st
From: |
Nazmul Islam |
Subject: |
[Discuss-gnuradio] Channel sounding and synchronization of continuous streams of data |
Date: |
Sun, 3 Jun 2012 21:47:18 -0400 |
Hello,
I am trying to implement a channel sounder using gnuradio-companion. I have attached the snapshots of my transmitter and receiver with the email.
In the transmitter, a GLFSR float source is going through a root raised cosine filter and then getting connected to the real input of USRP. I am storing the complex I&Q samples in a sink file in the receiver. Thereafter, I am correlating the complex samples with the reference GLFSR sequence offline.
Expectedly, my setup is suffering from synchronization issue since I don't have any synchronizer block in the receiver setup. This issue worsens with higher number of chips. Based on this setup, I have the following questions:
1. Has anyone implemented a channel sounder in grc before? In an earlier email (http://lists.gnu.org/archive/html/discuss-gnuradio/2010-05/msg00058.html), Jonathan said that there is a plan of re-implementing gr-sounder with synchronization. I am just curious if anyone took that path.
2. How can I synchronize a continuous stream of I&Q data? If I put a costas loop and M&M recovery block between the USRP source and the file sink, will it resolve the issue?
Any suggestion will be really helpful.
Thanks,
Nazmul
--
Muhammad Nazmul Islamhi
Graduate Student
Electrical & Computer Engineering
Wireless Information & Networking Laboratory
Rutgers, USA.
sounder_transmitter.grc
Description: application/gnuradio-grc
sounder_receiver.grc
Description: application/gnuradio-grc
sounder_transmitter.png
Description: PNG image
sounder_receiver.png
Description: PNG image
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Nazmul Islam <=