Re: [Discuss-gnuradio] underrun occurs when frequency changing

2011-12-12 Thread Yan Nie
> >Really appreciate any of your suggestion! > > > Underrun is caused by your flow-graph not being able to provide samples to > the hardware at the specified rate.  It looks to me like in >   your flow-graph above, your message-queue can easily get starved for new > bits, and so the entire flow-g

[Discuss-gnuradio] underrun occurs when frequency changing

2011-12-09 Thread Yan Nie
Dear all, I am trying to transmit a sequence at various frequencies on USRP N200 with LFTX. When I use the uhd.single_usrp_source.set_center_freq() to change the frequency then insert the the sequence as a message in the msgq buffer in another thread other than top_block, underrun occurs. The

Re: [Discuss-gnuradio] stream tags in Python

2011-12-08 Thread Yan Nie
Thank you so much for your suggestions. I am wondering how to connect these work class with other blocks in the flowgraph which have been built? In other words, how to use them in flowgraph building? On 12/01/11, Josh Blum wrote: > > > On 12/01/2011 01:31 PM, Yan Nie wrote: >

[Discuss-gnuradio] stream tags in Python

2011-12-01 Thread Yan Nie
Dear all, I need to use stream tags and the get_time_last_pps informations to control the received data storage. I am wondering how to get the stream tags in Python? I tried the method used in C++ and transfered in Python     samp0_count = self.nitems_read(0)     get_tags_in_range(rx_time_tags,

Re: [Discuss-gnuradio] Using PPS to trigger received data storage in Python

2011-11-28 Thread Yan Nie
Thank you so much for your suggestions, Josh. Your suggestion on solving the problem I met is absolutely creative. Thank you so much! I have more further detailed questions related: get_time_last_pps gives a timespec representing the last pps, while how can I  obtain the stream tags from the

Re: [Discuss-gnuradio] Using PPS to trigger received data storage in Python

2011-11-25 Thread Yan Nie
I really appreciate your reply, Josh. I am using a GPS as the input for PPS of my receiver based on USRP N200 in order to synchronize with a transmitter which uses GPS pulse to synchronize with other devices. This transmitter detects the NEG edge of GPS pulse, then 2ms later, starts to transmit

[Discuss-gnuradio] using PPS signal to trigger the received data storage in Pyton

2011-11-23 Thread Yan Nie
Dear all, I am using USRP N200 with LFRX +UHD to design a receiver, which works fine to continuously receive data. I need to use PPS signal to trigger the received data storing only for 1ms every second after detecting the edge of PPS signal every second. I tried the approach introduced in th

[Discuss-gnuradio] Using PPS to trigger received data storage in Python

2011-11-23 Thread Yan Nie
 Dear all, I used USRP N200 with LFRX +UHD to design a receiver, which works well to continuously receive data. I am trying to control the received data streaming using PPS to trigger received data storing, which is storing the received data into a data file for 1ms after receiver detecting the

Re: [Discuss-gnuradio] AttributeError: uhd module object has no attribute 'stream_cmd'

2011-11-07 Thread Yan Nie
Really appreciate your answer, Josh. I am wondering how to control data streaming from devices to host in Python, if the stream command issuing approaching cannot work in Python? What I am trying to do is detecting pps pulse then 2ms later start receiving data from USRP N200. The received data

[Discuss-gnuradio] AttributeError: uhd module object has no attribute 'stream_cmd'

2011-11-07 Thread Yan Nie
Dear all, I am using self.stream_cmd = uhd.stream_cmd() in Python to define how the devices send samples to the host, though got an AttributeError: 'module' object has no attribute 'stream_cmd'. I checked the definition of stream_cmd, which is an attribute of uhd and similar as clock_config. I

[Discuss-gnuradio] detect PPS every second for synchronization

2011-11-02 Thread Yan Nie
Dear all, I ma using USRP N200 with LFTX & LFRX +UHD to build up a transmitter and receiver. The transmitter and receiver are working well if continuously running without changing the USRP configuration. I am trying to use a GPS as the synchronization signal for signal reception, which is detec

[Discuss-gnuradio] PPS + timestamps used in Python ?

2011-10-11 Thread Yan Nie
Dear all I suppose to use GNURadio on USRP N200 + UHD to build a transmitter synchronized with another device used as a receiver via GPS. As posted on UHD website, PPS signal feeding in USRP N200 could be used for timestamp  synchronization. In the mailing list, it is said such tagging interfac

Re: [Discuss-gnuradio] GPIO setting on USRP N200 with LFTX plugged + UHD

2011-09-26 Thread Yan Nie
On 09/26/11, Josh Blum wrote: > > With gr-uhd you can call into the dboard iface from python. That > includes USRP1 and N200. > > This is the dboard iface: > http://files.ettus.com/uhd_docs/doxygen/html/classuhd_1_1usrp_1_1dboard__iface.html > > -Josh  Thank you so much for your reply, Josh.

[Discuss-gnuradio] GPIO setting on USRP N200 with LFTX plugged + UHD

2011-09-26 Thread Yan Nie
Dear all, I am using USRP N200 with LFTX and LFRX plugged + UHD to design a transmitter and a receiver. I am trying to toggle a GPIO pin high when the LFTX board is transmitting and low otherwise, which is similar to the io_tx_06 pin on RFX boards. >From what I found, this I/O pin could be con

[Discuss-gnuradio] which sample rate is set by uhd.single_usrp_source.set_samp_rate?

2011-09-15 Thread Yan Nie
 Dear all, In my project, I am using uhd.single_usrp_source to set the configuration for USRP N200 with LFRX DB. The sub-function set_samp_rate is used to set the sample rate, though I am not sure this sample rate setting is set to which signal, before Digital Down Conversion or after? Original

[Discuss-gnuradio] Problems from running FPGA configuration for USRP N200 in ISE 13.1

2011-08-09 Thread Yan Nie
Dear all, I am using 30-day trial version of ISE 13.1 to get the RTL view of the standard FPGA configuration for USRP N200 in order to see what functionalities implemented in FPGA on USRP N200 board. The device I selected to do the simulation is exactly the FPGA chip used in USRP N200, X

Re: [Discuss-gnuradio] io_type configuration for uhd.single_usrp_source

2011-07-21 Thread Yan Nie
> well, sizeof(complex) == sizeof(float), which means gnuradio will > let you connect those blocks, but that definitively wont work. > > For the UHD source, use COMPLEX_FLOAT32. For the FIR filter, use complex > input. > > gnuradio-companion might help you a lot: > http://en.wikipedia.org/wiki/GN

[Discuss-gnuradio] io_type configuration for uhd.single_usrp_source

2011-07-20 Thread Yan Nie
 Dear all, I am using USRP N200 +UHD with the LFRX daughter board to detect a 100kHz coded sinusoid wave then down convert the signal to baseband to see the coding method. The flow graph I am using is: u2=uhd.single_usrp_source(device_addr="addr=192.168.10.2",io_type=uhd.io_type_t.COMPLEX_INT16

[Discuss-gnuradio] GUNRadio+UHD installation on USRP E200

2011-07-08 Thread Yan Nie
Dear all, I installed GNURadio+UHD on USRP E200 in Ubuntu 10.10 system by using the build-gnuradio script Marcus offered. After installation successfully completely, using uhd_find_devices gave the result: -- -- UHD Device 0 ---

Re: [Discuss-gnuradio] help: UHD, gnuradio and USRP

2011-07-07 Thread Yan Nie
> And I just noticed that you mentioned Gnu Radio 3.2.  I was assuming that > you'd installed from recent source.  You'll need the very >   latest Gnu Radio.  If you don't mind starting over from the beginning, you > can download the following script: > > http://www.sbrac.org/files/build-gnuradi

[Discuss-gnuradio] Question about installation: No UHD Devices Found

2011-07-06 Thread Yan Nie
 Dear all, I am trying to install UHD+GNU Radio in Linux (Ubuntu 10.10) on USRP N200 without DB by following the command:    git clone git://code.ettus.com/ettus/uhd.git     cd /host     mkdir build     cd build     cmake p { margin-bottom: 0.

[Discuss-gnuradio] question about antenna using on LFRX

2011-03-29 Thread Yan Nie
Dear all, If I use usrp_source_c to introduce a complex signal from a USRP1 with LFRX, and sink into a data file as complex signal, do  I have to using both of the antenna on one LFRX daughter board, one for I channel, the other one for Q channel. If using usrp_source_c as the source signal, bu

Re: [Discuss-gnuradio] method to improve the detection sensitivity of USRP1 with LFRX

2011-03-28 Thread Yan Nie
ffset? Many appreciation! Yan On 03/28/11, "Marcus D. Leech" wrote: > On 03/28/2011 06:41 PM, Yan Nie wrote: > > Dear all, > > > > I'm using LFRX to detect a -120dBm signal. According to my measurement, the > > lowest power of signal that LFRX is

[Discuss-gnuradio] method to improve the detection sensitivity of USRP1 with LFRX

2011-03-28 Thread Yan Nie
Dear all, I'm using LFRX to detect a -120dBm signal. According to my measurement, the lowest power of signal that LFRX is able to detect is -90dBm. I tried deploy a preamplifier to amplify the received signal by certain dB in order to reach the -90dBm, but this turned out that noise is amplifie

[Discuss-gnuradio] relation between the amplitude and the voltage of the signal

2011-03-25 Thread Yan Nie
Dear all, I'm wondering how to correspond the amplitude set in software to the voltage of the signal. I did some test, which demonstrate that setting the amplitude to 32767 and the GPA gain to 20dB could reach full scale 2V p-p. I'm confused about the amplitude setting in software, if 32767(whi

[Discuss-gnuradio] what the relation between the amplitude set in program and voltage of the received signal

2011-03-20 Thread Yan Nie
Dear all, I'm using USRP1 with LFRX plug-in. Could you please tell me what's the relation between the amplitude that we set in program and the voltage of the received signal. For instance, if I receive a signal whose amplitude read from the received data file is 2000 units, what's the correspon

Re: [Discuss-gnuradio] lowest power of the signal that LFRX can receive

2011-03-15 Thread Yan Nie
On 03/15/11, Alexandru Csete wrote: > > On Wed, Mar 16, 2011 at 1:07 AM, Marcus D. Leech wrote: > >> Dear all, > >> > >> What is the lowest power of the signal that LFRX can receive? > >> > >> Really appreciate any of your help > >> > >> Yan > >> > > The LFRX has almost no gain, so you're limit

[Discuss-gnuradio] lowest power of the signal that LFRX can receive

2011-03-15 Thread Yan Nie
Dear all, What is the lowest power of the signal that LFRX can receive? Really appreciate any of your help Yan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

[Discuss-gnuradio] how to decrease the latency of reconfiguring the parameters to sub-blocks while tb is running

2011-03-08 Thread Yan Nie
Dear all, I got latency when the parameter of the blocks is reconfigured while the top_block is running. Could anyone give some suggestion how to reduce this latency? The flowgraph that I build is: message_source --> chunks_to_symbols([-1,1])-->multiply_const_ff --> float_to_short -->usrp_sink_s

Re: [Discuss-gnuradio] message_source repeatly transmit msg 10times

2011-03-07 Thread Yan Nie
m I need to get solved for my project. It really gets stuck here. Really appreciate any suggestion on solving this problem! Yan On 03/07/11, Yan Nie wrote: > > > > I also tried msgq.flush() to delete all of the data in the queue as soon the > data is inserted to

Re: [Discuss-gnuradio] message_source repeatly transmit msg 10times

2011-03-06 Thread Yan Nie
_to_symbols_bf(constellation_table). Could anyone give me some suggestion on what's the problem here to allow me keep on going? Really appreciate any of your help! Yan On 03/06/11, Yan Nie wrote: > > Dear all, > > I'm using message_source generate data source then modulat

[Discuss-gnuradio] message_source repeatly transmit msg 10times

2011-03-06 Thread Yan Nie
Dear all, I'm using message_source generate data source then modulated and transmitting through USRP1 board with LFTX plugged-in. After building the flow graph, I used the msgq_insert to insert 1950 bytes data into the flow graph to be transmitted, then insert another group of data which is 975

[Discuss-gnuradio] how to decide the msgq_limit?

2011-03-03 Thread Yan Nie
Dear all, I'm using gr.message_source as the signal source and using multiply_const_ff to set the amplitude of the signal then feeding the signal into USRP1 with LFTX plugged-in. The message need to be transmitted in my project is 3315 bytes. After the flow graph starting to run, msgq.insert_ta

Re: [Discuss-gnuradio] questions related to msgq_insert

2011-03-03 Thread Yan Nie
nding problem? Really appreciate your help! Yan On 03/03/11, Martin Braun wrote: > > On Wed, Mar 02, 2011 at 09:18:39PM -0500, Yan Nie wrote: > > Dear all, > > > > I'm using the message_source to generate the source, connecting it with a > > multiply_const block t

[Discuss-gnuradio] questions related to msgq_insert

2011-03-02 Thread Yan Nie
Dear all, I'm using the message_source to generate the source, connecting it with a multiply_const block to configure the amplitude for the signal.  The message_source is created by the following: data = gr.message_source(sizeof_char, 2) msgq = data.msgq() When the msg is inserted as a tail of

[Discuss-gnuradio] Any approach can reconfigure parameters for top_block while it's running

2011-02-28 Thread Yan Nie
Dear all, I'm wondering is there any approach can reconfigure the parameters for top_block while it is running. I've seen a video on Youtube that implemented the tuning frequency hopping, which is named "A program written for the GNU Radio that changes the TX frequency of the USRP". This video

[Discuss-gnuradio] Any approach can reconfigure parameters for top_block while it's running

2011-02-28 Thread Yan Nie
Dear all,I'm wondering is there any approach can reconfigure the parameters for top_block while it is running. I've seen a video on Youtube that implemented the tuning frequency hopping, which is named "A program written for the GNU Radio that changes the TX frequency of the USRP". This video shows

[Discuss-gnuradio] how to reconfigure the parameters of top_block after it start runnig

2011-02-25 Thread Yan Nie
Dear all, I'm developing a transmitter in python, using USRP1 with LFTX plug-in under GNU Radio 3.2. I'm wondering how to reconfigure some of the parameters of top_block, while the flow graph has been running. How can I dynamically alter some of the parameters of top_block every 1 second, whil

Re: [Discuss-gnuradio] how to stop the top_block and restart signal transmission

2011-02-25 Thread Yan Nie
Really appreciate your reply, Jason! I tried the approach recommended by using grc_usrp.simple_sink_s to take the place of usrp.sink_s. Then, I called the set_enable() function on simple_sink_s at the scheduler part to disable the transmitter after the top_block starts to run. An attributeError

Re: [Discuss-gnuradio] how to stop the top_block and restart signal transmission

2011-02-23 Thread Yan Nie
..But without the lock() and unlock(), everything returns to normal.Thanks,GuanboOn Wed, Feb 23, 2011 at 5:55 PM, Yan Nie > wrote: Hi Guanbo, In my case,  I added a tb.wait() after the tb is unlock to wait for the unlock action finished, so that the last line shows. However, it still gives the carrier

Re: [Discuss-gnuradio] how to stop the top_block and restart signal transmission

2011-02-23 Thread Yan Nie
gt; tb.lock() > print "after lock()" > time.sleep(1) > print "before unlock()" > tb.unlock() > print "after unlock()" > > I found out that, the last print is not showing up. > > Do you have idea regarding to this issue? > Thanks > >

Re: [Discuss-gnuradio] how to stop the top_block and restart signal transmission

2011-02-23 Thread Yan Nie
Hi Jason, I really appreciate your help about the problem that I got. The info related to the GNURadio and the USRP that I'm using is listed in the following. > > Please confirm that you just see the carrier, not your modulated > signal when using the lock()/unlock() I checked the result of us

Re: [Discuss-gnuradio] how to stop the top_block and restart signal transmission

2011-02-23 Thread Yan Nie
Dear all,I'm really sorry about the last uncompleted email. I elaborated the method lock() and unlock() to completely pause the flow graph without transmitting any signal, even if  the carrier wave, but the continuous carrier wave still shows on the oscilloscope. I'm trying to transmit 13-bit Barke

Re: [Discuss-gnuradio] how to stop the top_block and restart signal transmission

2011-02-22 Thread Yan Nie
ution to this problem! really appreciate! Thanks, Yan On 02/22/11, "Yan Nie" wrote: > > > > Hi Tom, > > > Sorry about the question. I tried the method lock() and unlock() to pause the > flow graph that I built, but I still can see the continuous signa

Re: [Discuss-gnuradio] how to stop the top_block and restart signal transmission

2011-02-22 Thread Yan Nie
e! Thanks, Yan On 02/21/11, Tom Rondeau wrote: > > On Mon, Feb 21, 2011 at 9:50 PM, Yan Nie wrote: > > Dear all, > > I'm trying to stop top_block implementing the signal transmission for 5 > > milliseconds and then restart the signal transmission at the transm

[Discuss-gnuradio] how to stop the top_block and restart signal transmission

2011-02-21 Thread Yan Nie
Dear all, I'm trying to stop top_block implementing the signal transmission for 5 milliseconds and then restart the signal transmission at the transmitter side, by using the tb.stop() then time.sleep(0.005) to suspend the system for 5 milliseconds then tb.start() to start the signal transmissio

[Discuss-gnuradio] how to suspend the flowgragh without any signal transmission for a few sec

2011-02-18 Thread Yan Nie
Dear all, how to pause the system for 5 milliseconds? I'm trying to transmit signal then suspend the system without any signal transmission for about 5 milliseconds. The following is the part of code that I use to implement this, but it just continuously transmitting signal, and I cannot see an

Re: [Discuss-gnuradio] unable to coerce endpoint

2011-02-18 Thread Yan Nie
hat the problem here? Why it cannot stop the transmission for 5 milliseconds. Really appreciate your help. Thanks, Yan On 02/18/11, Tom Rondeau wrote: > > On Thu, Feb 17, 2011 at 7:06 PM, Yan Nie wrote: > > Dear all, > > > > I'm trying to feed the received signal

[Discuss-gnuradio] unable to coerce endpoint

2011-02-17 Thread Yan Nie
Dear all, I'm trying to feed the received signal from USRP to a low-pass filter and sink the filtered signal into a data file. The received signal is in complex format. The receiver is built as: u = usrp.source_c(0) coeffs = gr.firdes.low_pass(1.0, 500e3, 20e3,.5e3,gr.firdes.WIN_HAMMING) lpf =

[Discuss-gnuradio] lowest power of the signal that LFRX can capture

2011-02-14 Thread Yan Nie
Dear all, What's the lowest power of the signal that LFRX can capture? How can I receive a signal between -20dBm and -10dBm by LFRX? I already set the USRP gain to the greatest, 20dB, but still cannot really capture any signal. I will really appreciate if any help on this problem. Thanks, Yan

[Discuss-gnuradio] Could transmitter and receiver alternately work in time on the same USRP1 with LFTX/RX?

2011-02-08 Thread Yan Nie
Dear all, I'm developing a radar transmitter and receiver on USRP1 and LFTX/RX. The transmitter and receiver are working fine separately on two USRP1 with TX and RX daughter board plugged in. I'm trying to make the transmitter and receiver alternately work in time on the same USRP1. For instanc

Re: [Discuss-gnuradio] precise transmit scheduling

2010-11-10 Thread Yan Nie
y-bit, how can I push this sequence in to the msg_queue bit-by-bit?Thank you so much for your help!Sincerely,YanOn 11/04/10, "Steven Clark" wrote:On Thu, Nov 4, 2010 at 5:33 PM, Yan Nie > wrote: Dear all,I am developing a transmitter on USRP1 with LFTX daughterboard. This transm

[Discuss-gnuradio] precise transmit scheduling

2010-11-04 Thread Yan Nie
Dear all,I am developing a transmitter on USRP1 with LFTX daughterboard. This transmitter sends a BPSK modulated Barker code sequence up-converting to a frequency ranging from 1MHz to 20MHz. I implemented the transmission of the whole sequence in one fixed frequency in the requried range on one USR

[Discuss-gnuradio] LFTX and LFRX synchronization on one USRP1

2010-10-31 Thread Yan Nie
Dear all,How to run the transmission path and receiving path alternatively in terms of time, for building the synchronization block for a radio system. This radio system are built on one USRP1 with LFTX and LFRX plug-in. Actually, the transmission path and receiving path are working well on two USR

[Discuss-gnuradio] tx and rx running simultanrously

2010-09-20 Thread Yan Nie
Hi all,I'm trying to design a transceiver which is running LFTX/LFRX on one USRP1 motherboardsimultaneously. Is that possible to enable the transmitter path and receiver path simultaneously? Since the usrp_sink and usrp_source block can only enable the transmitter path or receiver path, I couldn't

[Discuss-gnuradio] 'gr_hier_block2_sptr' object has no attribute '_write_fpga_reg'

2010-08-22 Thread Yan Nie
Hi all, I'm working on a synchronization block to allow the transmitter and receiver to co-locate on the same motherboard and work alternatively, transmitter working for 0.5 second then receiver working for 0.5 second, and then repeat this process.  I'm using USRP1 and LFTX/RX to develop my

[Discuss-gnuradio] problem on write fpga reg

2010-08-13 Thread Yan Nie
Hi all, I'm working on a synchronization block to allow the transmitter and receiver to co-locate on the same motherboard and work alternatively, transmitter working for 0.5 second then receiver working for 0.5 second, and then repeat this process. I'm using USRP1 and LFTX/RX to develop my

[Discuss-gnuradio] Is it possible to change the sampling rate of D/A converter

2010-06-23 Thread Yan Nie
Dear all, Is it possible to change the sampling rate of D/A converter to 64MHz? I saw the sampling rate of D/A converter is defined in usrp_basic.cc, which is fpga_master_clock_freq() * 2. Is it possible to make the master clock frequency not multiply by 2? Can it be changed in python when the

[Discuss-gnuradio] format of data in datafile produced by file_sink_c

2010-06-02 Thread Yan Nie
Dear all, I'm wodering the format of data in datafile which produced by file_sink_c. I used octave function read_complex_binary to read the data. Since the usbdata is a 16-bit binary data sent from FPGA to usb controller, is the first 16 lines of the data represent the first sample point of the

Re: [Discuss-gnuradio] maximum recursion depth exceeded

2010-06-01 Thread Yan Nie
> Also, what version of GNU Radio are you using? > (I seem to remember we made a change that produced a more informative > message in this case.) > > Eric Thank you so much for the reply. I'm using GNU Radio 3.2 svn. I've another question related to the received data. I'm trying to capture the

[Discuss-gnuradio] maximum recursion depth exceeded

2010-06-01 Thread Yan Nie
Dear all, An runtime error came out when I run my python prgram: File "/home/john/gnuradio/gr-iono/usrp_source_c.py", line 16, in __init__ gr.io_signature(1,1,gr.sizeof_gr_complex))#output signiture File "/usr/local/lib/python2.5/site-packages/gnuradio/gr/hier_block2.py", line 42, in __

[Discuss-gnuradio] amplitude coded square wave

2010-05-18 Thread Yan Nie
Hi all, I'm trying to generating a square wave, the amplitude of each chip the square wave is coded by a 113-bit legendre code respectively. The following code is generating a source for legendre code: #ls 113-bit bits = (1,0,0,1, 0,0,0,1, 0,1,1,1, 1,0,1,0, 1,1,1

[Discuss-gnuradio] How to set bitrate

2010-05-13 Thread Yan Nie
Hi all, How to set the bitrate and the DAC output amplitude, if only need to generate baseband signal as a 25kHz square wave and tune to RF? Thank you so much Regards, Yan <>___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.

[Discuss-gnuradio] amplitude setting problem

2010-05-12 Thread Yan Nie
Dear all, I'm using digital bert to transmit a BPSK modulated binary sequence. Since I don't need the rrc filter, I'm using the following to set the amplitude. self._amp = gr.multiply_const_cc(1) self.set_tx_amplitude(amplitude) set_tx_amplitude function definition is: def set

[Discuss-gnuradio] Quesions on BPSK transceiver

2010-05-10 Thread Yan Nie
Dear all, I'm trying to build a BPSK transmitter which is modulated with a group of binary sequence of bits by USRP1 with LFTX/RX plugged on. The frequence of the sequence in baseband should be 25kHz, I'm modifying the digital-bert project in gnuradio-example, using the following two line to

[Discuss-gnuradio] how to decide the number of taps of RRC filter

2010-04-26 Thread Yan Nie
Dear all, I'm trying to transmit a sequence with code rate of 3kHz. How to decide the number of taps of RRC filter? Or is there any good reference talking about how to calculate the number of the taps? Thank you so much in advance! Regards, Yan <>__

Re: [Discuss-gnuradio] overrun problem on gr-sounder project

2010-04-22 Thread Yan Nie
Hi Johnathan, Thank you so much for the response on the suggestion of BPSK modulation implementation. I still have some questions on FPGA configuration and USRP baord: 1. What signal on the input of the receiver side (rx_a_a and rx_b_a) in gr-sounder application? (should the 12-bit signal be

Re: [Discuss-gnuradio] overrun problem on gr-sounder project

2010-04-22 Thread Yan Nie
> > I'm modifying the gr-sounder project to transmit a 113-bit  > legendre sequence > > of the bandwith 32kHz and upconvert to certain frequency in  > the range 1MHz > > to 20MHz. At receiver side, the received signal is  > downconverted to baseband > > and store the received sequence into a data f

[Discuss-gnuradio] overrun problem on gr-sounder project

2010-04-22 Thread Yan Nie
Hi Johnathan, I'm modifying the gr-sounder project to transmit a 113-bit legendre sequence of the bandwith 32kHz and upconvert to certain frequency in the range 1MHz to 20MHz. At receiver side, the received signal is downconverted to baseband and store the received sequence into a data file.

[Discuss-gnuradio] How to solve the USRP overrun problem

2010-04-21 Thread Yan Nie
Dear all, I'm modifying the gr-sounder project to transmit a 113-bit legendre sequence of the bandwith 32kHz and upconvert to certain frequency in the range 1MHz to 20MHz. At receiver side, the received signal is downconverted to baseband and store the recovered sequence into a data file. I

[Discuss-gnuradio] Question on receiver tuning issue

2010-04-08 Thread Yan Nie
class load the FPGA bitstream?  Thanks, Yan - Original Message - From: Johnathan Corgan Date: Tuesday, April 6, 2010 11:32 pm Subject: Re: [Discuss-gnuradio] Questions on DDC in gr-sounder project To: Yan Nie Cc: discuss-gnuradio@gnu.org > On Tue, Apr 6, 2010 at 08:19, Yan Ni

Re: [Discuss-gnuradio] Questions on DDC in gr-sounder project

2010-04-06 Thread Yan Nie
load the FPGA bitstream?  Thanks, Yan - Original Message - From: Johnathan Corgan Date: Tuesday, April 6, 2010 11:32 pm Subject: Re: [Discuss-gnuradio] Questions on DDC in gr-sounder project To: Yan Nie Cc: discuss-gnuradio@gnu.org > On Tue, Apr 6, 2010 at 08:19, Yan Nie wrote: &g

[Discuss-gnuradio] Questions on DDC in gr-sounder project

2010-04-06 Thread Yan Nie
Dear all, I'm trying to understand how Digital Down Conversion Implemented in gr-sounder project. The DDC needs to be implemented in FPGA, but there isn't any module in FPGA configuration implementing DDC. How does the receiver in gr-sounder implement Digital Down Conversion? Thanks a lot in

[Discuss-gnuradio] questions on DDC in FGPA configuration

2010-03-30 Thread Yan Nie
Dear all, I'm reading the receiver part of gr-sounder project. As my undering, in the FPGA configuration of this project, the received signal directly goes to the sounder module, after being demuxed into I and Q signals by adc_interface module.  I didn't see any module of the FPGA configuratio

[Discuss-gnuradio] DDC in gr-sounder FPGA configuration

2010-03-28 Thread Yan Nie
Dear all, I'm reading the receiver part of gr-sounder project. As my undering, in the FPGA configuration of this project, the received signal directly goes to the sounder module, after being demuxed into I and Q signals by adc_interface module.  I didn't see any module of the FPGA configuratio

[Discuss-gnuradio] DDC in gr-sounder FPGA configuration

2010-03-23 Thread Yan Nie
Dear all, I'm reading the receiver part of gr-sounder project. As my undering, in the FPGA configuration of this project, the received signal directly goes to the sounder module, after being demuxed into I and Q signals by adc_interface module. I didn't see any module of the FPGA configuration

[Discuss-gnuradio] failed to load firmware

2010-03-02 Thread Yan Nie
Hi all, I got a problem on opening usrp, but this program and the usrp worked well before. The error message is as below: e...@ubuntu:~$ usrp_sounder.py -t -f 3M write_internal_ram failed: error sending control message: Protocol error usrp: failed to load firmware /usr/local/share/usrp/rev2/std.

[Discuss-gnuradio] power limitation of LFRX daughterboard

2010-03-02 Thread Yan Nie
Dear all, I wanna apply a series of signal generated from the signal generator as a input of the LFRX daughterboard to test my FPGA configuration for at the receiver side. I'm wondering what the power limitation of the LFRX daughterboar is? Thanks in advance Regards, Yan _

[Discuss-gnuradio] directory of .dat file?

2010-02-16 Thread Yan Nie
Hi all, I'm wondering the directory of output.dat, which is the receiving data file of gr-sounder? Thanks in advance. Regards, Yan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

Re: [Discuss-gnuradio] tx frequency changing by clk_divider

2010-01-28 Thread Yan Nie
ng by clk_divider To: Yan Nie Cc: discuss-gnuradio@gnu.org > On Wed, Jan 27, 2010 at 15:08, Yan Nie wrote: > > > The major problem of the frequency decreasing is the > transmitting signal > > from the antenna doesn't show the result of BPSK modulation in > the

[Discuss-gnuradio] tx frequency changing by clk_divider

2010-01-27 Thread Yan Nie
Dear all, I'm trying to use clk_divider block to down the frequency of baseband PN code in project gr-sounder to 32kHz. The time quest analysis of the verilog code shows the result is correct. After the FPGA bitstream loaded,however, the waveform of the signal still contains some high frequenc

[Discuss-gnuradio] questions about data freq of data input DAC

2010-01-22 Thread Yan Nie
Thank you so much Eric. I've another questions can the DAC data input frequency be slow down to 25kHz? or make the frequency of data transmitted from FPGA be slow down to 25kHz? How can I make it? Thanks in advance. Regads, Yan ___ Discuss-gnuradio mail

Re: [Discuss-gnuradio] default DAC setting

2010-01-22 Thread Yan Nie
- Original Message - From: Eric Blossom Date: Monday, January 18, 2010 9:09 pm Subject: Re: [Discuss-gnuradio] default DAC setting To: Yan Nie Cc: discuss-gnuradio@gnu.org > On Tue, Jan 19, 2010 at 07:03:37AM +0800, Yan Nie wrote: > > Dear all, > > > > What'

[Discuss-gnuradio] default DAC setting

2010-01-18 Thread Yan Nie
Dear all, What's the default setting, if python doesn't write any register in AD9862. For example, in gr-sounder project there isn't any configuration for AD9862 chip. Thanks in advance Regards, Yan ___ Discuss-gnuradio mailing list Discuss-gnuradi

[Discuss-gnuradio] DAC configuration of gr-sounder

2010-01-17 Thread Yan Nie
Hi Johnathan, I'm trying to understand the project gr-sounder and have some questions on that. 1. What's the configuration of AD9862 for the transmitter in gr-sounder. I didn't any code setting the register of AD9862 in the python code of gr-sounder project. 2. I used an oscilloscope to watch

[Discuss-gnuradio] need help on loading my own FPGA bitstream

2010-01-15 Thread Yan Nie
Dear all, I'm trying to load my own FPGA bitstream. The .rbf file, however, cannot be loaded due to the errors as below. I've already copied the .rbf file under the directories /usr/local/share/usrp/rev2 and rev4 as well. Could you please guide me what the problem or the solution to solve the

[Discuss-gnuradio] questions about master_control.v

2010-01-14 Thread Yan Nie
Hi, I'm trying build my own fpga bitstream by modifying usrp_sounder project. I've saveral questions on the module master_control. what store in reg_0, reg_1, reg_2, and reg3? what assign to io_0 through io_3? Can I monitor the signal from io_tx pins in daughter board by oscilloscope? What th

[Discuss-gnuradio] gr-sounder running on Basic TX and RX

2010-01-12 Thread Yan Nie
Hello, Can gr-sounder run on Basic daughter board? If not, what's the problem? (gr-sounder said "the boards may be standalone LFTX/LFRXs or RFX daughterboards", but what the reasons will be?) Thanks in advanced Yan ___ Discuss-gnuradio mailing list Di

Re: [Discuss-gnuradio] how to load my own .rbf bitstream?

2010-01-11 Thread Yan Nie
he problem it sould be? Thanks in advance Yan - Original Message - From: Mattias Kjellsson Date: Monday, January 11, 2010 3:34 pm Subject: Re: [Discuss-gnuradio] how to load my own .rbf bitstream? To: discuss-gnuradio@gnu.org > Yan Nie wrote: > > Hello, > > > > I've

[Discuss-gnuradio] how to load my own .rbf bitstream?

2010-01-11 Thread Yan Nie
Hello, I've created my own .rbf file. I see the USRP loads the FPGA bitstream from /usr/rev{2,4}/*.rbf, but it doesn't allow me to copy my .rbf file into this directory. How can I load my FPGA bitstream? Thanks in advance. Yan ___ Discuss-gnuradio ma

[Discuss-gnuradio] schematic map of USRP FPGA/FX2 Interface, FPGA/CODECs Interface

2010-01-08 Thread Yan Nie
Thank you Matt and Tim. How about the USRP FPGA/FX2 Interface, FPGA/CODECs Interface, and CODECs/FX2 Interface? Where can I get these? I saw them in the previous gnuradio website, but didn't download them. I cannot find them in the new gnuradio web. Thank you so much Yan ___

[Discuss-gnuradio] schematic and layout map for USRP

2010-01-08 Thread Yan Nie
Hello, I'm looking for the schematic and layout map for USRP1, but I cannot find the schematic at the download page of http://www.ettus.com/download . Could you please tell me where can I get the the schematic and layout map of USRP1. Thank you so much! Yan _

[Discuss-gnuradio] where can I get the schematic and layout of USRP?

2010-01-07 Thread Yan Nie
I'm trying to find the schematic and layout of USRP board. The website http://gnuradio.org/svn/usrp-hw/trunk for schematic of USRP cannot be opened. I didn't find the schematic and layout in http://www.ettus.com/download either. Could you please give me some hint where can I find the schemati

[Discuss-gnuradio] how to debug gr-sounder program

2009-09-02 Thread Yan Nie
Hi, I want to track the gr-sounder program to see the role each module plays in the whole gr-sounder module, because I need to modify the some verilog module in gr-sounder. what can I use to debug the program? I'm using PyDev+eclipse to complie the python code, and Quartus to compile verilog

[Discuss-gnuradio] what does the folder tb in gr-sounder do?

2009-08-12 Thread Yan Nie
I'm a beginner of gnuradio, and I'm trying to understand all the programs in gr-sounder. What does the folder tb in gr-sounder do? How all the program in gr-sounder are organized. Any explaination of these program?(like what does each program do? or how can read them?) Thank you in advance!

[Discuss-gnuradio] can't receive any radio by FM receive in GRC

2009-07-22 Thread Yan Nie
Hi, I'm running the FM receiver to get FM radio in GRC, but I got noise only without any error shown after execution. Could you help me what the problem could be? I'm pretty new to gnuradio, is there any useful and helpful reference for a beginner to quickly learn it? Thank you very much for y