Hi, Thanks Mr. Economos and Mr. Braun,
I left this parameter in blank (I guess this is the same as an empty string), it seems that it is working now. Actually I am trying to modulate ISDB-T data stream. I am working with vectors, instead of data stream. Thanks again. 2014-05-14 5:28 GMT-03:00 Martin Braun <martin.br...@ettus.com>: > On 14.05.2014 04:36, Ron Economos wrote: > >> If you're sending packets, then Length Tag Key should be >> set to the packet length you're using. If you're sending >> a stream (like DVB-T), then this field is not used (and >> left blank). >> > > It needs an empty string, in this case. > > > The OFDM cyclic prefixer is used after the (reverse) >> FFT block. The FFT Length in the OFDM Cyclic Prefixer >> block should match the FFT Size in the FFT block. >> > > That's right. The block doesn't check if the input is actually OFDM. > > Martin > >> >> Ron >> >> On 5/13/2014 6:06 PM, Yuri P.M wrote: >> >>> Hello, >>> >>> My name is Yuri. >>> I very new to GNU Radio, and I'm using GRC 3.7.1. >>> >>> >>> I am doing a research, and I need to modulate specific signal in OFDM. >>> I would like to insert cyclic prefix (or guard interval in my project, >>> the same thing with a different name). >>> >>> I looked at the examples >>> under gr-digital >>> /examples/ofdm, and I've also read some papers about OFDM technics. >>> >>> My doubt is: what is the parameter "Length Tag Key"? I've seen it >>> working in the examples located in the folder above, I've tried to do >>> the same in my project, but it states a message that this parameter is >>> missing. >>> >>> By chance, does this cyclic prefixer block only works with other >>> blocks of the same category? I mean, do I need to use OFDM carrier >>> allocator before it, or something like that? >>> >>> Thank you for your attention, >>> >>> Yuri. >>> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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