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Re: [Discuss-gnuradio] OFDM results.

From: Hoo-chang Shin
Subject: Re: [Discuss-gnuradio] OFDM results.
Date: Wed, 4 Jun 2008 04:41:05 -0700 (PDT)

Hi Andreas,

where is the inaccuracy in sampling frequency exactly happening?

Hoo Chang Shin.

----- Original Message ----
From: Andreas Müller <address@hidden>
To: address@hidden
Cc: address@hidden
Sent: Wednesday, June 4, 2008 12:48:00 PM
Subject: Re: [Discuss-gnuradio] OFDM results.

Hello Per

> What is the cause of the problems. Clock jitter ?, non-linearities ?

No idea what could be the problem in your case, but maybe try also
plotting the phase of all symbols in one OFDM symbol vs the offset from
the central carrier.

I'm currently working on DAB and I found some problems by doing this,
e.g. in [1] there is a frequency dependent phase offset due to an
inaccurate the sampling frequency.

Regards, Andreas

[1] http://people.ee.ethz.ch/~andrmuel/tmp/phase-vs-subcarrier.png

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