Re: [Discuss-gnuradio] Re: Soft-DVB DVB-T transmitter
On Tue, 2008-11-11 at 08:26 +0100, Vincenzo Pellegrini wrote: Martin , sorry for the delay. My exams seem to have gone well even if it's not official yet. Great I also had to do a demo for a company I have a temporary contract with for developing some gnuradio based gsm-r security sentinels. Also the demo was smooth. (i already listed the project on the gnuradio wiki) Good work. so i really hope i'll be able to prepare the 8Mhz stream for you within the next 2/3 days. Would this still be useful? Yes it really would. I am also really looking forward for the sources. One of the things I am planning to do is use the structure of your code as a basis for a DVB-T receiver. It is always easier debugging a receiver when you can make a full loop. (transmitter and receiver back-to-back) Greetings, Martin 2008/11/3, Martin DvH [EMAIL PROTECTED]: On Mon, 2008-11-03 at 14:13 +0100, Martin DvH wrote: Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens Vincenzo Pellegrini Verzonden: maandag 3 november 2008 0:16 Aan: Martin DvH CC: discuss-gnuradio Onderwerp: [Discuss-gnuradio] Re: Soft-DVB DVB-T transmitter This is Great... :) Yup, the playback cannot be smooth because of the wrong throughput, definitely. Did you use the USRP1 with interpolation factor = 16 ? Yes I did. I can prepare a modulated signal with the correct throughput for you.. this is not a problem... :) Please do, this would be great. what hard disc are you playing your signal back from? Internal 2.5 harddisk of my acer 6930 notebook (Aspire 6930G-734G32BN LX.AVB0X.135) 2.5 320GB HDD 5400rpm, SATA I checked now. It is a: Western digital Scorpio 320 GB SATA (WDC WD3200BEVT-22ZCT0) 2.5-inch SATA Hard Drive 320 GB, 3 Gb/s, 8 MB Cache, 5400 RPM Benchmark from tomshardware (h2benchw 3.6): http://www.tomshardware.com/charts/2-5-hard-drive-charts/Minimum-Read-Transfer-Performance,687.html minimum read transfer rate 33.5 MB/sec average read transfer rate 52.2 MB/sec maximum read transfer rate 68.2 MB/sec I am not at home right now So I can't check the exact brand and model of the harddisk. It can do around 38 MB/sec so this is just enough (required 32 MB/sec) I also have 4GB of memory in this notebook, so I think it will buffer the complete file. I had to use my notebook because with my desktop PC (ASrock 939-DUAL-SATA2) The USB TX bandwidth is less then 32 MB/sec. (Which is strange because I CAN receive 32 MB/sec) I get UuUuUu on this machine when useing interpolation 16, so unusable. Regards, Martin regards vincenzo 2008/11/3 Martin DvH [EMAIL PROTECTED] Hi, In fact: 8 complex Msps implement a 7 MHz channel while 9.142857143 complex Msps implement an 8 MHz channel. Just try to go as close as possible to such sampling frequency by using USRP2 and let me know what happens... it could turn out that we need a resampler block. So if I use a fractional rate resampler with interpolation factor 10/8=1.25 I get a 7 Mhz channel with 10 Msps samplerate. If I use a fractional rate resampler with interpolation factor 10/9.142857143=1.09375 I get a 8 Mhz channel with 10 Msps samplerate If I use a fractional rate resampler with DECIMATION factor 9.142857143/8=8/7=1.142857143 I get a 8 Mhz channel with 8 Msps samplerate with the out-of-band skirts folded back at the sides. Would be interesting to see if this last one works with a USRP1. I'll let you know how the experiments go. I resampled and scaled your ofdm_40.dump file so it now will use 8 Mhz bandwidth with a 8 Msps samplerate. The reception never can be perfect this way but it seems good enough for tests. My USB DVB-T receiver receives the transport stream without problems. Mplayer playes the stream without problem for two loops and then crashes with a broken frame. My standalone settopbox DVB-T receiver now also receives the stream. (8 MHz channel on UHF) It has big problems displaying it. Sound is only a chop of sound now and then and video stops, then runs for a second, then stops again. I think this is because the timestamps and framerate (playout speed) don't match the data throughput of the MPEG stream anymore. (It is getting the stream too fast) I put my resampled RF file at:
Re: [Discuss-gnuradio] Re: Soft-DVB DVB-T transmitter
Hello people, I'm following the discussion about the Soft-DVB, and I'm thinking about use of the WBX0510 daughterboard (50 MHz to 1 GHz) w/ Soft-DVB - Will then be possible to transmitt in any VHF/UHF channel? Bye, Rafael Diniz Em Tuesday 11 November 2008, Vincenzo Pellegrini escreveu: Martin , sorry for the delay. My exams seem to have gone well even if it's not official yet. I also had to do a demo for a company I have a temporary contract with for developing some gnuradio based gsm-r security sentinels. Also the demo was smooth. (i already listed the project on the gnuradio wiki) so i really hope i'll be able to prepare the 8Mhz stream for you within the next 2/3 days. Would this still be useful? 2008/11/3, Martin DvH [EMAIL PROTECTED]: On Mon, 2008-11-03 at 14:13 +0100, Martin DvH wrote: Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens Vincenzo Pellegrini Verzonden: maandag 3 november 2008 0:16 Aan: Martin DvH CC: discuss-gnuradio Onderwerp: [Discuss-gnuradio] Re: Soft-DVB DVB-T transmitter This is Great... :) Yup, the playback cannot be smooth because of the wrong throughput, definitely. Did you use the USRP1 with interpolation factor = 16 ? Yes I did. I can prepare a modulated signal with the correct throughput for you.. this is not a problem... :) Please do, this would be great. what hard disc are you playing your signal back from? Internal 2.5 harddisk of my acer 6930 notebook (Aspire 6930G-734G32BN LX.AVB0X.135) 2.5 320GB HDD 5400rpm, SATA I checked now. It is a: Western digital Scorpio 320 GB SATA (WDC WD3200BEVT-22ZCT0) 2.5-inch SATA Hard Drive 320 GB, 3 Gb/s, 8 MB Cache, 5400 RPM Benchmark from tomshardware (h2benchw 3.6): http://www.tomshardware.com/charts/2-5-hard-drive-charts/Minimum-Read-Tra nsfer-Performance,687.html minimum read transfer rate 33.5 MB/sec average read transfer rate 52.2 MB/sec maximum read transfer rate 68.2 MB/sec I am not at home right now So I can't check the exact brand and model of the harddisk. It can do around 38 MB/sec so this is just enough (required 32 MB/sec) I also have 4GB of memory in this notebook, so I think it will buffer the complete file. I had to use my notebook because with my desktop PC (ASrock 939-DUAL-SATA2) The USB TX bandwidth is less then 32 MB/sec. (Which is strange because I CAN receive 32 MB/sec) I get UuUuUu on this machine when useing interpolation 16, so unusable. Regards, Martin regards vincenzo 2008/11/3 Martin DvH [EMAIL PROTECTED] Hi, In fact: 8 complex Msps implement a 7 MHz channel while 9.142857143 complex Msps implement an 8 MHz channel. Just try to go as close as possible to such sampling frequency by using USRP2 and let me know what happens... it could turn out that we need a resampler block. So if I use a fractional rate resampler with interpolation factor 10/8=1.25 I get a 7 Mhz channel with 10 Msps samplerate. If I use a fractional rate resampler with interpolation factor 10/9.142857143=1.09375 I get a 8 Mhz channel with 10 Msps samplerate If I use a fractional rate resampler with DECIMATION factor 9.142857143/8=8/7=1.142857143 I get a 8 Mhz channel with 8 Msps samplerate with the out-of-band skirts folded back at the sides. Would be interesting to see if this last one works with a USRP1. I'll let you know how the experiments go. I resampled and scaled your ofdm_40.dump file so it now will use 8 Mhz bandwidth with a 8 Msps samplerate. The reception never can be perfect this way but it seems good enough for tests. My USB DVB-T receiver receives the transport stream without problems. Mplayer playes the stream without problem for two loops and then crashes with a broken frame. My standalone settopbox DVB-T receiver now also receives the stream. (8 MHz channel on UHF) It has big problems displaying it. Sound is only a chop of sound now and then and video stops, then runs for a second, then stops again. I think this is because the timestamps and framerate (playout speed) don't match the data throughput of the MPEG stream anymore. (It is getting the stream too fast) I put my resampled RF file at: http://www.olifantasia.com/projects/gnuradio/mdvh/OTA/DVB-T/ofdm_40_bw8M hz_s amplerate_8Msps_cshort.raw format is complex signed short integers (I 16 bit, Q 16 bit) at 8 Msamples/sec.
RE: [Discuss-gnuradio] Re: Soft-DVB DVB-T transmitter
Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens Vincenzo Pellegrini Verzonden: maandag 3 november 2008 0:16 Aan: Martin DvH CC: discuss-gnuradio Onderwerp: [Discuss-gnuradio] Re: Soft-DVB DVB-T transmitter This is Great... :) Yup, the playback cannot be smooth because of the wrong throughput, definitely. Did you use the USRP1 with interpolation factor = 16 ? Yes I did. I can prepare a modulated signal with the correct throughput for you.. this is not a problem... :) Please do, this would be great. what hard disc are you playing your signal back from? Internal 2.5 harddisk of my acer 6930 notebook (Aspire 6930G-734G32BN LX.AVB0X.135) 2.5 320GB HDD 5400rpm, SATA I am not at home right now So I can't check the exact brand and model of the harddisk. It can do around 38 MB/sec so this is just enough (required 32 MB/sec) I also have 4GB of memory in this notebook, so I think it will buffer the complete file. I had to use my notebook because with my desktop PC (ASrock 939-DUAL-SATA2) The USB TX bandwidth is less then 32 MB/sec. (Which is strange because I CAN receive 32 MB/sec) I get UuUuUu on this machine when useing interpolation 16, so unusable. Regards, Martin regards vincenzo 2008/11/3 Martin DvH [EMAIL PROTECTED] Hi, In fact: 8 complex Msps implement a 7 MHz channel while 9.142857143 complex Msps implement an 8 MHz channel. Just try to go as close as possible to such sampling frequency by using USRP2 and let me know what happens... it could turn out that we need a resampler block. So if I use a fractional rate resampler with interpolation factor 10/8=1.25 I get a 7 Mhz channel with 10 Msps samplerate. If I use a fractional rate resampler with interpolation factor 10/9.142857143=1.09375 I get a 8 Mhz channel with 10 Msps samplerate If I use a fractional rate resampler with DECIMATION factor 9.142857143/8=8/7=1.142857143 I get a 8 Mhz channel with 8 Msps samplerate with the out-of-band skirts folded back at the sides. Would be interesting to see if this last one works with a USRP1. I'll let you know how the experiments go. I resampled and scaled your ofdm_40.dump file so it now will use 8 Mhz bandwidth with a 8 Msps samplerate. The reception never can be perfect this way but it seems good enough for tests. My USB DVB-T receiver receives the transport stream without problems. Mplayer playes the stream without problem for two loops and then crashes with a broken frame. My standalone settopbox DVB-T receiver now also receives the stream. (8 MHz channel on UHF) It has big problems displaying it. Sound is only a chop of sound now and then and video stops, then runs for a second, then stops again. I think this is because the timestamps and framerate (playout speed) don't match the data throughput of the MPEG stream anymore. (It is getting the stream too fast) I put my resampled RF file at: http://www.olifantasia.com/projects/gnuradio/mdvh/OTA/DVB-T/ofdm_40_bw8Mhz_s amplerate_8Msps_cshort.raw format is complex signed short integers (I 16 bit, Q 16 bit) at 8 Msamples/sec. Greetings, Martin more details will follow as soon as I find some time... Thanks and success with your second group of tests. Martin best regards and greetings to all fellow GNURadioers vincenzo PS Rafael, just have a look back a this thread and you'll find all the info you need to do your test broadcast. Thanks for your interest 2008/10/31 Martin Dudok van Heel [EMAIL PROTECTED] Hi Vincenzo. How are things going with your exams. I hope well. Thanks for your help so far.
RE: [Discuss-gnuradio] Re: Soft-DVB DVB-T transmitter
On Mon, 2008-11-03 at 14:13 +0100, Martin DvH wrote: Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens Vincenzo Pellegrini Verzonden: maandag 3 november 2008 0:16 Aan: Martin DvH CC: discuss-gnuradio Onderwerp: [Discuss-gnuradio] Re: Soft-DVB DVB-T transmitter This is Great... :) Yup, the playback cannot be smooth because of the wrong throughput, definitely. Did you use the USRP1 with interpolation factor = 16 ? Yes I did. I can prepare a modulated signal with the correct throughput for you.. this is not a problem... :) Please do, this would be great. what hard disc are you playing your signal back from? Internal 2.5 harddisk of my acer 6930 notebook (Aspire 6930G-734G32BN LX.AVB0X.135) 2.5 320GB HDD 5400rpm, SATA I checked now. It is a: Western digital Scorpio 320 GB SATA (WDC WD3200BEVT-22ZCT0) 2.5-inch SATA Hard Drive 320 GB, 3 Gb/s, 8 MB Cache, 5400 RPM Benchmark from tomshardware (h2benchw 3.6): http://www.tomshardware.com/charts/2-5-hard-drive-charts/Minimum-Read-Transfer-Performance,687.html minimum read transfer rate 33.5 MB/sec average read transfer rate 52.2 MB/sec maximum read transfer rate 68.2 MB/sec I am not at home right now So I can't check the exact brand and model of the harddisk. It can do around 38 MB/sec so this is just enough (required 32 MB/sec) I also have 4GB of memory in this notebook, so I think it will buffer the complete file. I had to use my notebook because with my desktop PC (ASrock 939-DUAL-SATA2) The USB TX bandwidth is less then 32 MB/sec. (Which is strange because I CAN receive 32 MB/sec) I get UuUuUu on this machine when useing interpolation 16, so unusable. Regards, Martin regards vincenzo 2008/11/3 Martin DvH [EMAIL PROTECTED] Hi, In fact: 8 complex Msps implement a 7 MHz channel while 9.142857143 complex Msps implement an 8 MHz channel. Just try to go as close as possible to such sampling frequency by using USRP2 and let me know what happens... it could turn out that we need a resampler block. So if I use a fractional rate resampler with interpolation factor 10/8=1.25 I get a 7 Mhz channel with 10 Msps samplerate. If I use a fractional rate resampler with interpolation factor 10/9.142857143=1.09375 I get a 8 Mhz channel with 10 Msps samplerate If I use a fractional rate resampler with DECIMATION factor 9.142857143/8=8/7=1.142857143 I get a 8 Mhz channel with 8 Msps samplerate with the out-of-band skirts folded back at the sides. Would be interesting to see if this last one works with a USRP1. I'll let you know how the experiments go. I resampled and scaled your ofdm_40.dump file so it now will use 8 Mhz bandwidth with a 8 Msps samplerate. The reception never can be perfect this way but it seems good enough for tests. My USB DVB-T receiver receives the transport stream without problems. Mplayer playes the stream without problem for two loops and then crashes with a broken frame. My standalone settopbox DVB-T receiver now also receives the stream. (8 MHz channel on UHF) It has big problems displaying it. Sound is only a chop of sound now and then and video stops, then runs for a second, then stops again. I think this is because the timestamps and framerate (playout speed) don't match the data throughput of the MPEG stream anymore. (It is getting the stream too fast) I put my resampled RF file at: http://www.olifantasia.com/projects/gnuradio/mdvh/OTA/DVB-T/ofdm_40_bw8Mhz_s amplerate_8Msps_cshort.raw format is complex signed short integers (I 16 bit, Q 16 bit) at 8 Msamples/sec. Greetings, Martin more details will follow as soon as I find some time... Thanks and success with your second group of tests. Martin best regards and greetings to all fellow GNURadioers vincenzo PS Rafael, just have a look back a this thread and you'll find all the info you need to do your test broadcast. Thanks for your interest
