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Re: Ofdm transceiver with more than 16QAM

From: pv
Subject: Re: Ofdm transceiver with more than 16QAM
Date: Wed, 11 Nov 2020 13:03:55 +0000
User-agent: Horde Application Framework 5

I don know how can I measure the SNR with QAM modulation. There is only a MPSK SNR probe.
Can you tell me how to measure SNR with MQAM?

Thanks for your help,
Pedro Viegas

Citando Marcus Müller <mmueller@gnuradio.org>:

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

Pedro Viegas
Signal Processing Engineer
Koala Tech
phone: +351 917 354 070
e-mail: pv@koalatech.pt

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