Hi Bob, i am sorry for answering that late (was on holidays wiht very limited Internet access).
Changing frequency solved my problem. But I am not sure why. I use a wbx v3 daugtherboard (range 68,75 – 2200 MHz ). uhd_usrp_probe-file is attached. Thanks for your help. Sebastian Von: Robert McGwier Gesendet: Montag, 28. August 2017 17:11 An: Sebastian Cc: discuss-gnuradio@gnu.org Betreff: Re: [Discuss-gnuradio] Using Correlate Estimation with hardware Sebastian What center frequency did you use? What RF cards are you using? Are you using coaxial cable,to connect transmit to receive or are you transmitting and receiving through an antenna? If you are using antennas please describe them. Cheers Bob Bob On Aug 26, 2017 12:12 PM, "Sebastian" <sebastian_be...@online.de> wrote: Hi all, i run into trouble using the correlate estimation block. As far as i understand this blocks is used to search for a praeamble which is modulated and filtered with match filter. To achieve this i used modulate vector. I used this block like it`s done in the corr_est exapmles provided in /gnuradio/gr-digital/examples/. Using no UHD but a channel modell everything works fine having clear correlation peak. Using it with hardware device it doesn`t work anymore, having more peaks avaiable. My flowgraph is very simple: Vector_source (using prae+data as vector tagged with tx_sob and tx_eob) -> constellation Modulator(default-QPSK-object) -> stream mux with null_source for break -> uhd sink(sync = PC_clock) Uhd source (sync = PC_clock) -> low_pass -> corr_est(modulated_vector, 0.9) -> Pll-clock-sync -> Costas Loop -> constellation-demodulator -> float_to_char -> qt time sink Modulate vector is called with default-qpsk-object as constellation object and [1] as filter taps which i think is right. The praeamble i am using is the one provided in the examples, so it should be ok too. I dont have that much experience in this topic so I hope somebody is able to help me. I am looking forward to hearing from you and thank you in advance. Sebastian PS : I am not sure where and how to provide the flowgraph itself but i´ll try to do it asap. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
grc1@grc1-Precision-M6700:~$ uhd_usrp_probe [INFO] [UHDlinux; GNU C++ version 5.4.0 20160609; Boost_105800; UHD_3.11.0.git-181-g8f9f4184] [INFO] [B100] USRP-B100 clock control: 10 r_counter: 2 a_counter: 0 b_counter: 20 prescaler: 8 vco_divider: 5 chan_divider: 5 vco_rate: 1600.000000MHz chan_rate: 320.000000MHz out_rate: 64.000000MHz _____________________________________________________ / | Device: B-Series Device | _____________________________________________________ | / | | Mboard: B100 | | serial: E4R13WBB1 | | name: b100 | | FW Version: 4.0 | | FPGA Version: 11.4 | | | | Time sources: none, external, _external_ | | Clock sources: internal, external, auto | | Sensors: ref_locked | | _____________________________________________________ | | / | | | RX DSP: 0 | | | | | | Freq range: -32.000 to 32.000 MHz | | _____________________________________________________ | | / | | | RX Dboard: A | | | ID: WBX v3, WBX v3 + Simple GDB (0x0057) | | | Serial: F38109 | | | _____________________________________________________ | | | / | | | | RX Frontend: 0 | | | | Name: WBXv3 RX+GDB | | | | Antennas: TX/RX, RX2, CAL | | | | Sensors: lo_locked | | | | Freq range: 68.750 to 2200.000 MHz | | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB | | | | Bandwidth range: 40000000.0 to 40000000.0 step 0.0 Hz | | | | Connection Type: IQ | | | | Uses LO offset: No | | | _____________________________________________________ | | | / | | | | RX Codec: A | | | | Name: ad9522 | | | | Gain range pga: 0.0 to 20.0 step 1.0 dB | | _____________________________________________________ | | / | | | TX DSP: 0 | | | | | | Freq range: -32.000 to 32.000 MHz | | _____________________________________________________ | | / | | | TX Dboard: A | | | ID: WBX v3 (0x0056) | | | Serial: F38109 | | | ID: WBX + Simple GDB, WBX v3 + Simple GDB, WBX v4 + Simple GDB, WBX-120 + Simple GDB (0x004f) | | | Serial: 0 | | | _____________________________________________________ | | | / | | | | TX Frontend: 0 | | | | Name: WBXv3 TX+GDB | | | | Antennas: TX/RX, CAL | | | | Sensors: lo_locked | | | | Freq range: 68.750 to 2200.000 MHz | | | | Gain range PGA0: 0.0 to 31.0 step 1.0 dB | | | | Bandwidth range: 40000000.0 to 40000000.0 step 0.0 Hz | | | | Connection Type: IQ | | | | Uses LO offset: No | | | _____________________________________________________ | | | / | | | | TX Codec: A | | | | Name: ad9522 | | | | Gain range pga: -20.0 to 0.0 step 0.1 dB
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