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Re: [Discuss-gnuradio] Why the Qam modulation cannot work well in ofdm b
From: |
Martin Braun (CEL) |
Subject: |
Re: [Discuss-gnuradio] Why the Qam modulation cannot work well in ofdm benchmark example? |
Date: |
Sun, 3 Nov 2013 11:09:41 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Fri, Nov 01, 2013 at 07:23:33PM -0700, Yingjie Chen wrote:
> Recently, I have conducted a project based on ofdm benchmark. However, when I
> use the high modulation rate like qam16 and qam64, the packet error rate
> increase significantly. I guess the reason is that the preamble in gunradio is
> too weak to do channel estimation, thereby raising the packet error rate.
>
> Furthermore, even though I test the example offline without going through the
> channel, the packet error rate still very high, which make me feel confused.
> It is supposed to perform normally offline, without any decoding error right?
In order to do QAM over OFDM, you will need a good equalizer; we
currently don't have good ones implemented.
MB
--
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)
Dipl.-Ing. Martin Braun
Research Associate
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Building 05.01
76131 Karlsruhe
Phone: +49 721 608-43790
Fax: +49 721 608-46071
www.cel.kit.edu
KIT -- University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association
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