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From: | Martin Braun |
Subject: | Re: [Discuss-gnuradio] On air 16_QAM transmission problem with USRP N210 |
Date: | Fri, 02 May 2014 17:08:04 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 |
On 02.05.2014 16:59, zielalaoui wrote:
Hi to all, I resolved my problem and I want to share the solution The problem was the amplitude in the QAM demod block input. I checked the constellation in the transmitter directly before UHD usrp block for being sure the the constellation points are good depending on the samples/symbol value (8 worked good). After that i just try to adapte the amplitude signal in reception by adding gain for to have the same signal which i had in my QAM simulation. Like that the transmission worked good. Zakaria
Zakaria,generally, your equalizer should be taking care of that. Adjusting gain is an unreliable method, since the actual attenuation of your signal over-the-air is a function of many things.
But nice that your experiment is working! Martin
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