The USRP is not in the same league with the USRP2. The on board
oscillator is much better but external oscillators will make it even
better. So the answer is a big yes, the USRP2 will be better.
Bob
Per Zetterberg wrote:
-----Original Message-----
From: Bob McGwier [mailto:[EMAIL PROTECTED]
Sent: den 6 juni 2008 09:23
To: Per Zetterberg
Cc: [email protected]; 'Per Zetterberg'
Subject: Re: [Discuss-gnuradio] OFDM results.
In your sixteen QAM and other figures I see two effects.
Notice just the slightest hint that arcs through the top four
constellation points in the 16 QAM is not straight. This
curvature is caused by nonlinearity.
Your result almost surely can NOT be clock jitter. If you
had a lot of clock jitter, the pictures would look much
worse. Notice the dispersion gets larger as your proceed
away from the origin. This is almost surely phase noise in
some oscillator.
Bob
Thanks!
New question:
Would the phase noise get smaller in USRP2 where we can use an external
reference, given that we use a high precision external reference ?
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