[Discuss-gnuradio] Question about USRP2 transmitter with OFDM packet.

Hi, One weeks ago I downloaded OFDM program (modified for USRP2, from Veljko Pejovic ) and tested with it. I got a problem when I used USRP2 to transmit OFDM packets. When I transmit continuous OFDM signals the receiver only receive some pieces of packet. So I tried to test with one packet.

RE: [Discuss-gnuradio] Question about UHD output data type.

Hi, The range of an int16 is +/-2^15, the minimum step is 1 because its an integer. Did you by any change change the io type to int16, but interpret the buffer as a complex float? -josh I figure out that UHD output small endian data. But I use it as big endian,that is the reason why

[Discuss-gnuradio] Question about UHD output data type.

Hi, I met a strange problem about UHD output data. I write the sampler program according to rx_timed_samples.cpp and use int 16 bits as io type as in command: size_t num_rx_samps = dev-recv( buff, sizeof(buff), md, uhd::io_type_t::COMPLEX_INT16,

[Discuss-gnuradio] Is there command to enable J503 test connector in UHD?

Hi, I want to test the clock of USRP2 with UHD. Is there UHD function replaces original function clocks_enable_test_clk()? Thank you for your help! Liang ___ Discuss-gnuradio mailing list

[Discuss-gnuradio] USRP2 synchronization with UHD works!

Hi, After several days test, I got the conclusion that USRP2 could be synchronized with UHD accurately. The lastest UHD version fixed stream bug with PPS and make it possible to sampling with delay less than 0.5ns. I attached histogram of delay distribution. The test is run on two USRP2

[Discuss-gnuradio] Delay of synchronization with PPS and UHD on USRP2

Hi, These days I am trying to synchronize two USRP2 with PPS signal and UHD. The two USRP2 is connect with same reference clock and PPS signal. I use function set_time_next_pps(uhd::time_spec_t(0)) to set time to be zero, and make two USRP2 start sampling after 3 seconds. The result shows

RE: [Discuss-gnuradio] Delay of synchronization with PPS and UHD on USRP2

Hi， You need to configure the usrp2 to use the external reference. Did you run set_clock_config(...) prior to setting the time? Yes, I have set the clock config to make USRP2 lock to reference clock SMA and PPS SMA. When performing set_time_next_pps(...) you will want a sleep(1) prior to

[Discuss-gnuradio] could not find device after flashing uhd firmware

I downloaded the image from the website and flashed it into the SD card. With command 'uhd_find_devices' I could not find the USRP2 for most of time(try hundred times find twice). I could not get reply for the ping command neither. I used 1GB card. There is no firewall. And the computer has

[Discuss-gnuradio] problems about building uhd.

Hi, I followed the uhd build instructions and there is error of undefined reference of boost functions...it is the error information below: --- Linking CXX executable rx_timed_samples CMakeFiles/rx_timed_samples.dir/rx_timed_samples.cpp.o: In function `_main(int,

[Discuss-gnuradio] The problem solved, uhd could not be build with boost 1.42

The previous problem disappeared when I changed library to boost 1.37. Thanks! Liang _ 约会说不清地方？来试试微软地图最新msn互动功能！

[Discuss-gnuradio] occur error when rebuild FPGA source

Hi, I am using xilinx ISE 11.1 to rebuild FPGA source. With command /gnuradio/usrp2/fpga/top/u2_rev3$ make bin I get error = while executing project set $key $opt -process $process invoked from within if ![string compare $process Project] {

[Discuss-gnuradio] error of mapping when rebuild FPGA

with command gnuradio/usrp2/fpga/top/u2_rev3$ make bin I got errors when mapping: ERROR:Pack:2310 - Too many comps of type RAMB16 found to fit this device. ERROR:Pack:18 - The design is too large for the given device and package. below is design summary... = Design Summary: Number

[Discuss-gnuradio] problem of compiling FPGA bin files.

Hi, I tried to use Xilinx ISE 11.1 to open project usrp2/fpga/top/u2_fpga/u2_fpga.ise.There are some files missing,such asfifo_generator_4_1.v . And there are errors when implement design... == ERROR:ConstraintSystem:59 - Constraint NET adc_a[0]

[Discuss-gnuradio] May I get 2 receivers on same channel by one USRP2?

hi, Now I am working with BasicRX daughterboard. I want to implement multi-receivers on the same channel. It works well when I connect only one antenna to RX-A of BasicRX borad.Then I want to sample by 2 antennas,which connect to RX-A and RX-B on BasicRX board. What configuration should I

[Discuss-gnuradio] new problem of synchronization(usrp2)

Thanks for Matt's bin file, I burn it to SD card and I have both good news and bad news. Good news is that it appears that the clock is gradually locked to reference clock about 10 seconds after USRP2 start up. The bad news is that it could only lock for about 4 or 5 seconds and then start to

[Discuss-gnuradio] About synchoronization of usrp2.

Hi, anybody test the synchronization with reference clock of usrp2? Now with command clocks_enable_test_clk(true, 1); I still get drifting between J503 and reference clock,is there anybody make it works? Thanks for any given words! Liang