[Discuss-gnuradio] mimo 2x1 based on benchmark_ofdm_mimo.py
From:
Jorge Hernandez
Subject:
[Discuss-gnuradio] mimo 2x1 based on benchmark_ofdm_mimo.py
Date:
Wed, 29 Feb 2012 16:22:46 +0100
Hi all,
I continue working on trying a 2x1 mimo system based on the benchmark_ofdm_mimo from Tom Rondeau's repository. I have done several trials and I am losing my mind trying to see why it doesn't work. I am using two USRP2 in the transmitter side and another one in the recevier side with XCVR2450 daughterboards, GNU C++ version 4.4.1 [gcc-4_4-branch revision 150839]; Boost_103900; UHD_003.004.000-122b947. In the receiver side all I see is a lot of messages with just an x, and every 10 x (more or less) I get a message: got preamble. I've been looking into the code and this messages are generated in the alamouti frame acquisition block. I guess the problem is in this very same block, when the synchronization has to be accomplished. I think this can be caused by a poor snr, but I don't know how to improve this in order to get this mimo configuration to work. I would like to share also the way I've configured the uhd_usrp2 sinks to see if maybe there is any error there. At this point, I would really appreciate any help! Thanks in advance: