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From: | Matt Ettus |
Subject: | Re: [Discuss-gnuradio] OFDM / DAB demodulation |
Date: | Sat, 01 Apr 2006 13:59:09 -0800 |
User-agent: | Thunderbird 1.5 (X11/20051201) |
Jens Elsner wrote: > I resampled all the data to do a proof-of-concept. The frames are > only a small part of the "chunk" variable. What I am getting is a > fairly nice pi/4 DPSK. Only that in between OFDM Symbols (there are > 76 in a frame) there is some sort of random phase jitter. And I am > clueless what it could be. Frequency offset is compensated, the > channel doesnt vary that fast. I'm confused. Are you seeing: good symbol -- jitter -- good symbol -- jitter -- good symbol or good symbol 76 times and then jitter ? Are you accounting for the cyclic prefix? I assume that COFDM has one. Matt
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