[Discuss-gnuradio] a issue about usrp underrun
Hi all, These days I encountered the problem of usrp underrun . The phenomenon is that I have two usrps, one is a sender and another is a receiver, the modulation is dqpsk. If the data rate of sender is low , the uU comes and the receiver lose lots of packet , and if the data rate of sender is high , all things are right. I think the reason for the lost packet may be the underrun of usrp. So I search for underrun. I get the reason of underrun is there is not enough data for usrp. I think the reason is right because the underrun comes up only when the data rate is low. I want to know whether there is any method to avoid the underrun when the data rate is low. And will the underrun of sender affect the receiver? Any advice is welcome! Thank you very much! -- Thanks, Jianfei BUAA ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] benchmark_tx of gnuradio-3.2.2
Hi all, At first, I use the benchmark_tx to send with usrp-a. After sending is finished ,I use the benchmark_rx to receive on the same usrp and there are another sender which is usrp-b.But I can't receive anything. The usrp_source_c gives nothing. If I reload the firmware of usrp-a, everything is Ok and I can receive the content sent by usrp-b, Anyone encounterd the same problem? My gnuradio is 3.2.2-release and gnuradio 3.1.3 don't have this problem. Any reply is appreciated. Thanks a lot. -- Thanks, Jianfei BUAA ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] read_aux_adc
Thanks for you reply, After reading the code, I think the argument 1,0 should be right. But the result is strange. when there isn't a sender , the value returned is always 12. While there is a sender and the distance between sender and receiver is less than 1m, the value returned is between 0~24 (maybe less than 12), no matter what the tx-amplitude of sender is. Does the result make sense? Thanks a lot. P.S. the result with a sender: 4 24 8 20 24 16 20 20 20 8 8 20 16 20 20 16 4 12 24 0 20 24 8 20 0 8 12 16 0 16 4; the result without a sender: 12 12 12 12 12 12 12 12 12 12 12 12 12 12 2010/6/1 Eric Blossom > On Mon, May 31, 2010 at 04:42:47PM +0800, jf w wrote: > > I'm using RFX2400 daughterboard on side B, my arguments are slot=2 > > which_adc = 0 ,and I'm calling it from python. > > > > Your question inspire me that my arguments may be wrong. I think the slot > > argument should be 3(SLOT_RX_B), but I don't know the meaning of > which_adc > > and how to set it. > > > > There are two aux_adc on one ad9862:aux_adc_a and aux_adc_b , but there > are > > four pins : aux_adc_a1,aux_adc_a2, aux_adc_b1 and aux_adc_b2. But what is > > the input of the signal on these pins? > > > > Thanks a lot. > > > > /*! > * \brief Read auxiliary analog to digital converter. > * > * \param which_side [0,1] which d'board > * \param which_adc [0,1] > * \returns value in the range [0,4095] if successful, else READ_FAILED. > */ > virtual int read_aux_adc (int which_side, int which_adc) = 0; > > Try > > v = u.read_aux_adc(1, 0) > > I think the RSSI is on adc 0, but not 100% sure. > > Eric > -- Thanks, Jianfei BUAA ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] read_aux_adc
I'm using RFX2400 daughterboard on side B, my arguments are slot=2 which_adc = 0 ,and I'm calling it from python. Your question inspire me that my arguments may be wrong. I think the slot argument should be 3(SLOT_RX_B), but I don't know the meaning of which_adc and how to set it. There are two aux_adc on one ad9862:aux_adc_a and aux_adc_b , but there are four pins : aux_adc_a1,aux_adc_a2, aux_adc_b1 and aux_adc_b2. But what is the input of the signal on these pins? Thanks a lot. 2010/5/31 Eric Blossom > On Mon, May 31, 2010 at 11:00:17AM +0800, jf w wrote: > > hi all, > > > > I want to use the read_aux_adc method to get the RSSI, but the results I > got > > seem meaningless. > > > > 1. Everytime I call the read_aux_adc, the result increases step by step. > > 2. No matter whether there is a sender, the result is the same. > > > > Does anyone come up against this problem ? > > Any suggestion is helpful to me. > > What daughterboard are you using? > Which side is it installed in, side A or side B? > What argument values are you passing to read_aux_adc? > Are you calling it from C++ or Python? > > Eric > -- Thanks, Jianfei BUAA ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] read_aux_adc
hi all, I want to use the read_aux_adc method to get the RSSI, but the results I got seem meaningless. 1. Everytime I call the read_aux_adc, the result increases step by step. 2. No matter whether there is a sender, the result is the same. Does anyone come up against this problem ? Any suggestion is helpful to me. Thanks P.S. the result is 3232 3136 3152 3176 3192 3204 3200 3208 3220 3232 3244 3252 3264 3272 3280 3288 3292 3296 3304 3308 3316 3320 3324 3328 3324 3336 3332 3336 3340 3340 3344 3348 3352 3356 3356 3360 3364 3364 3368 3368 3372 3376 3376 3376 3380 3380 3380 3384 3384 3388 3388 3388 3392 3392 3392 3396 3396 3400 3400 3400 3400 3404 3404 3404 3404 3408 3408 3408 3408 3412 1. -- Thanks, Jianfei BUAA ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] problems about usrp_read_aux_adc
Hi all, I want to read aux_adc of AD9862 to get the RSSI value.But when I read the code of method usrp_read_aux_adc, I am confused. The aux_adc of AD9862 is 10-bit. Why is the result of usrp_read_aux_adc formatted as 12-bit. -- Thanks, Jianfei BUAA ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] ofdm occupied tones concept
Hi all, I'm thinking about implementing non-contiguous OFDM with gnuradio. So I read the ofdm codes of gnuradio. And I find the occupied tones concept in gnuradio. Is it designed for non-contiguous OFDM? Or it is for other reasons? -- Thanks, Jianfei BUAA ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
