Tx is an abbreviation of tx blocks! :) I finally found the problem! I used heap memory but I never release it in different blocks! So during the runtime, the memory allocation get the error: "std::bad_alloc" after somewhile. Now this is fine.
Thank you too much, Best, Mostafa On Thu, Oct 16, 2014 at 4:16 PM, Marcus Müller <marcus.muel...@ettus.com> wrote: > I'm a bit confused. Your diagram > > TX->FIR->... > ->Filesink > > Indicates that TX is a source, whereas TX usually is an information sink > in DSP. Maybe you want to fill us in about the type of block TX is? > > Greetings, > Marcus > > On 16.10.2014 13:47, Mostafa Alizadeh wrote: > > Hi Marcus, > > > > I tested again my problem with connecting a data file (file source) to > the > > fir filter and read the output with the one resulted from Matlab. The > error > > which appears due to the data precision is in acceptable order. > > > > However, when I directly connect my tx to the fir filter, it did > something > > strange after sometime which causes a great error with respect to the > > Matlab one. > > > > *I think the problem is with my tx! I really confused!! I just wanna know > > how could I identify the problem and how could I fix it? * > > > > My scheme: > > > > *[image: Inline image 1]* > > > > Best, > > Mostafa > > > > On Wed, Oct 15, 2014 at 9:03 PM, Marcus Müller <marcus.muel...@ettus.com > > > > wrote: > > > >> Hello Mostafa, > >> > >> filtering is a inherently lossy operation: it's an operation that > involves > >> multiplication and addition of floating point numbers. > >> Matlab internally uses double (float64) values, whereas GNU Radio, > >> usually, uses single precision (float32) numbers for performance > reasons. > >> Now, without knowing what kind of signal you are filtering with what > kind > >> of taps you are using with what kind of GNU Radio filters and what > Matlab > >> functions, there's nothing to guess on how these differences occur. > >> What I *can* say though is that I've never seen an item drop in GNU > >> Radio's runtime, and we have strong tests against that. Now, it's > entirely > >> possible that any of our filter implementations might have bugs, but I > kind > >> of doubt that. It's most probably simply numeric accuracy that kills > your > >> samples. > >> > >> Greetings, > >> Marcus > >> > >> > >> > >> On 15.10.2014 18:07, Mostafa Alizadeh wrote: > >> > >> Hi all, > >> > >> It seems this is a ridiculous question, however, I didn't find any > solution > >> for my problem. > >> > >> I have already a bunch of custom blocks connected to each other which > play > >> role as a transmitter (tx). I want to connect tx to a fir filter by > using > >> fir_filter_ccc block. I set the filter taps with specific ones. I also > have > >> this filter in Matlab. The output of the filter is connected to a sink > file. > >> > >> When I see the output (tx) and filtering it by Matlab and comparing it > with > >> the output of the gnuradio filter, I see both of the following: > >> > >> 1) Both matlab and gnuradio filtered output, have little difference in a > >> range of 0.01. (I'm using gr_complex data). > >> > >> 2) After a while, Matlab output and GNURadio's output will differ as > high > >> as 1000 in magnitude!! > >> > >> I guess, there is item drops in this filtering. I know, the probability > of > >> this event is so weak, anyway, item drop even can happen in GNURadio? > >> > >> Where is my problem? > >> > >> Best, > >> Mostafa > >> > >> > >> > >> > >> _______________________________________________ > >> Discuss-gnuradio mailing listDiscuss-gnuradio@gnu.orghttps:// > lists.gnu.org/mailman/listinfo/discuss-gnuradio > >> > >> > >> > >> _______________________________________________ > >> Discuss-gnuradio mailing list > >> Discuss-gnuradio@gnu.org > >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >> > >> > > > > -- *********************************************************** Department of Electrical Engineering Aboureyhan Building MMWCL LAB Amirkabir University Of Technology Tehran IRAN Tel: +98 (919) 158-7730 LAB: http://ele.aut.ac.ir/~mmwcl/?page_id=411 Homepage: http://ele.aut.ac.ir/~alizadeh/ ***********************************************************
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