discuss-gnuradio
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] On air 16_QAM transmission problem with USRP N210


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




reply via email to

[Prev in Thread] Current Thread [Next in Thread]