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Re: Ofdm transceiver with more than 16QAM

From: Marcus Müller
Subject: Re: Ofdm transceiver with more than 16QAM
Date: Tue, 10 Nov 2020 23:37:58 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.3.1

Hi. this is a typical question like I'd ask it when talking a student
through a test for a digital comms computer lab. So here's a hint:

"Constellations with very many points" don't always work. It has to do
with SNR. Can you explain what the problem is with low SNR?

Best regards,

On 10.11.20 12:56, pv@koalatech.pt wrote:
> Hi, I'm trying to make an OFDM transmission of a png file (9.3 kB) with
> 256QAM with the gnuradio
> example of OFDM transmitter / receiver. The USRP I'm using is the ettus
> n210 with the cbx daughter board. With the QPSK and 16QAM modulations it
> works, but with 64QAM or 256QAM I can´t receive the file, sometimes it
> receives some packets but most of the time it doesn't receive any byte.
> Can anyone help me with with this problem?
> Thanks in advance.
> Pedro Viegas

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