Hi, For reading your data from file, you need to have a binary data file. Libre office file has a header and after that your text "11110000 ", in which "1" or "0' is a char not a bit! GNURadio bit generation sources assume "0" is a byte of bits "00000000" and "1" is a byte of bits "10000000". So you need to store your data in this binary format into a file.
Great, Mostafa On Thu, Jan 15, 2015 at 10:11 PM, Salman Dinani <salmandin...@gmail.com> wrote: > Hi to all, > > Thanks very much to all of you for your valuable suggestions.In accordance > with your suggestions, I experimented with my designed DQPSK system and got > few problems which I am listing down.All the referenced figures are > attached. > > - I reduced the symbol per sample to 4 (previously it was 8) and added > a RRC filter before constellation plot (figure RRC_const) but constellation > remains the same L > > > - I successfully demodulated the distorted constellation output by > using Cosine signal source as input (figure DQPSK_demod_S_2). As someone > previously suggested reducing the samples per symbol, I set it to 2 and ran > the simulation. The demodulated output was out of phase w.r.t input (figure > S_2_P_1).As I varied the frequency, the phase difference also varied as > shown in figures S_2_P_2 and S_2_P_3. When I set this parameter to 4 > (figure DQPSK_demod_S_4). The output got corrected (In-Phase) for all > frequencies (figure Plot_DQPSK_S_4). > > Why the signal is out of phase and phase shift is varying with > frequency??Why this problem got corrected when Samples per symbol > changed to 4? > > - In order to send my desired bit stream, I made a file in Libre > office with bits 11110000 and saved it with txt extension. (i.e. data.txt). > Before applying to the system, I tried to check the output of file source > on scope. But when I ran the program (figure File_source), the output > was zero. After several trials, I put the bit streams in inverted commas > "11110000" (figure file_dat ) some data appeared at the output (figure > output_dat). But this is not the data which I wrote in the file. > > Is there a special format for sending data via File Source?? > > > I am very sorry if my questions appear to be childish but I am not able to > figure them out. Eagerly waiting for your expert opinions. > > > Regards > > Salman Dinani > > > > > > _______________________________________________ > 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/ ***********************************************************
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
