[Discuss-gnuradio] OFDM with fft lenght 2048 and 4096 doesn't work

Hello I'm trying to send with benchmark_ofdm_tx and receive with benchmark_ofdm_rx a OFDM modulation with next paremeters: FFT lenght = 2048 Chanel occupied = 1512 Size of package = 1024 CP_adder = 128 and FFT lenght = 4096 Chanel occupied = 3024 Size of package = 1024 CP_adder = 128 I'm

[Discuss-gnuradio] OFMD Known Symbols

Hello I'm trying to modify the OFDM module implemented in GNU Radio, and I have a question. In DVB-H I need to set the continual pilot carrier and the scattered pilot carrier. Both are known by TX and RX, then, Are the known symbols, implemented in OFDM module, pilots carrier? Thanks! -- View

Re: [Discuss-gnuradio] OFMD Known Symbols

Thanks Tom, but in DVB-H, the continual and scattered pilot are used for the sync, If I change, in TX and RX, the position and value of knows symbols, Will I lost the sync? Tom Rondeau wrote: On Sat, Jun 19, 2010 at 1:20 PM, Chris_Spain christianper...@gmail.com wrote: Hello I'm trying

Re: [Discuss-gnuradio] OFMD Known Symbols

Thank you very much Tom Tom Rondeau wrote: On Sat, Jun 19, 2010 at 2:11 PM, Chris_Spain christianper...@gmail.com wrote: Thanks Tom, but in DVB-H, the continual and scattered pilot are used for the sync, If I change, in TX and RX, the position and value of knows symbols, Will I lost

Re: [Discuss-gnuradio] OFMD TX and RX

--+ f O = occupied_tones x = remaining subcarriers the two x at the center is to avoid DC offset. After ifft, the CP is added. OFDM is sensitive to the bitrate(interpolate/decimate), so set the bitrate carefully. Hope this will help you little. Fisheep. Chris_Spain wrote

[Discuss-gnuradio] Open .DAT files generated by OFDM Module

Hi all, I'm trying to open the .DAT files that are generated by OFDM Module with option --log but I can't. I have tried with cat, vim, vi, jeditor(with hex plugins), open office. With excel and notepad open the archive but only with ascii characters but I need to see the result of modulation.

[Discuss-gnuradio] OFMD TX and RX

Hello everybody, I' am trying to test and understand the OFDM Modulation implemented in GNU Radio. I'm using the deafult values, fft_lenth=512, occupied_tones =200, cp_length= 128 and bpsk modulation, besides, I'm using a RFX900 Daughterboards on USPR and I'm connecting the TX and RX with a

[Discuss-gnuradio] synchronization problems with benchmark_ofdm_tx.py and benchmark_ofdm_rx.py?

Hello everybody, I'm trying to check the GNU RADIO OFDM implementation but I have a problem. When I made, for first time, the benchmark_ofdm_tx.py and benchmark_ofdm_rx.py, everything was ok, but then, many times the RX seems not receive nothing or it print ok:false pktno:65471 n_rcvd:1

[Discuss-gnuradio] USRP underrun problems

Hello, I trying to implement DVB-H Standar on GNU Radio and USRP. In software, all run ok, but now I'm doing the first test with USRP and I have a problem that I have no idea how fix it. When I try to send with a Flex 900, freq=850M, fft-Lenth=2048, occupied-tones=1512 the program print

Re[Discuss-gnuradio] cursive call

Hello All, I'm trying manage a vector of 10528 bytes, I made a C++ routine and works but, when I work with my routine in GNU Radio, It do really extrange things and I don't know why. I try to explain: My Routine in GNU is: ex_scramb_ss::general_work (int noutput_items,

[Discuss-gnuradio] problem with delete_gr_basic_block_sptr

Hello, I'm new in GNU Radio and I'm had been following Dawei Shen's tutorials and in the last part in tutorial 11, when I did the last make check, testing the aplication example, raised following error: File /usr/lib/python2.6/unittest.py, line 457, in run for test in self._tests: