[srslte-users] Limesdr do not find cells

Mon Jul 29 14:15:53 UTC 2019

Hi all,

i want to receive cell information with a Limesdr an cell_search.
My problem is, that i found nothing.

I used an Ubuntu 18.04 and i clone the srsLte from here: 
https://github.com/srsLTE/srsLTE

When i run ~/srsLTE/build/lib/examples$ ./pdsch_ue -f 1815000000 the 
result is:

/Opening RF device with 1 RX antennas...//
//linux; GNU C++ version 7.3.0; Boost_106501; 
UHD_003.010.003.000-0-unknown//
//
//Soapy has found device #0: addr=1d50:6108, driver=lime, 
label=LimeSDR-USB [USB 3.0] 907060244071D, media=USB 3.0, module=FX3, 
name=LimeSDR-USB, serial=000907060244071D, //
//[INFO] Make connection: 'LimeSDR-USB [USB 3.0] 907060244071D'//
//[INFO] Reference clock 30.72 MHz//
//[INFO] Device name: LimeSDR-USB//
//[INFO] Reference: 30.72 MHz//
//[INFO] LMS7002M calibration values caching Disable//
//Setting up Rx stream with 1 channel(s)//
//Setting up Tx stream with 1 channel(s)//
//[INFO] RX LPF configured//
//Set Rx bandwidth to 2.50 MHz//
//[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 5 
MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not 
active//
//[INFO] TX LPF configured//
//Set Tx bandwidth to 5.00 MHz//
//Available device sensors: //
// - clock_locked//
// - lms7_temp//
//Available sensors for Rx channel 0: //
// - lo_locked//
//[INFO] Tx calibration finished//
//[INFO] Rx calibration finished//
//State of gain elements for Rx channel 0 (AGC not supported)://
// - TIA: 9.00 dB//
// - LNA: 30.00 dB//
// - PGA: -4.00 dB//
//State of gain elements for Tx channel 0 (AGC not supported)://
// - TIA: 9.00 dB//
// - LNA: 30.00 dB//
// - PGA: -4.00 dB//
//Rx antenna set to LNAL//
//Tx antenna set to BAND1//
//Starting AGC thread...//
//Set master clock rate to 30.72 MHz//
//Tunning receiver to 1815.000 MHz//
//Searching for cell...//
//[INFO] RX LPF configured//
//Set Rx bandwidth to 2.50 MHz//
//[INFO] Rx calibration finished//
//*Found Cell_id: 171 FDD, CP: Normal  , DetectRatio=100% PSR=6.19, 
Power=-44.3 dBm//
// Found Cell_id:   0 FDD, CP: Normal  , DetectRatio= 0% PSR=0.00, 
Power=-inf dBm//
// Found Cell_id:   0 FDD, CP: Normal  , DetectRatio= 0% PSR=0.00, 
Power=-inf dBm//
//Decoding PBCH for cell 171 (N_id_2=0)//
//[INFO] RX LPF configured//
//Set Rx bandwidth to 2.50 MHz//
//[INFO] Rx calibration finished//
//Set master clock rate to 23.04 MHz//
//Setting sampling rate 23.04 MHz//
//[INFO] RX LPF configured//
//Set Rx bandwidth to 17.28 MHz//
//[INFO] Rx calibration finished//
// - Type:            FDD   4.9, FrameCnt: 0, State: 1//
// - PCI:             171//
// - Nof ports:       2//
// - CP:              Normal //
// - PRB:             100//
// - PHICH Length:    Normal//
// - PHICH Resources: 1//
// - SFN:             972//
//Decoded MIB. SFN: 972, offset: 3//
//          CFO:  +80.00 Hz//
//         RSRP: +30.2 dBm | +29.6 dBm//
//          SNR:  +2.3 dB//
//           TM: 2//
//           Rb:   0.00 /   0.12 /   0.09 Mbps (net/maximum/processing)//
//   PDCCH-Miss: 12.50%//
//   PDSCH-BLER:  0.00%//
//         TB 0: mcs=3; tbs=176//
//         TB 1: mcs=0; tbs=0//
//Press enter maximum printing debug log of 1 subframe.//
//
//          CFO: -183.11 Hz//
//         RSRP: +43.4 dBm | +41.8 dBm//
//          SNR:  +4.2 dB//
//           TM: 2//
//           Rb:   0.03 /   0.18 /   0.05 Mbps (net/maximum/processing)//
//   PDCCH-Miss: 58.99%//
//   PDSCH-BLER:  2.02%//
//         TB 0: mcs=3; tbs=176//
//         TB 1: mcs=0; tbs=0//
//Press enter maximum printing debug log of 1 subframe./

/....

/

and if i run/~/srsLTE/build/lib/examples$ ./cell_search -b 3 -s 1299 -e 
1301/

/This is the result:

Opening RF device...
linux; GNU C++ version 7.3.0; Boost_106501; UHD_003.010.003.000-0-unknown

Soapy has found device #0: addr=1d50:6108, driver=lime, 
label=LimeSDR-USB [USB 3.0] 907060244071D, media=USB 3.0, module=FX3, 
name=LimeSDR-USB, serial=000907060244071D,
[INFO] Make connection: 'LimeSDR-USB [USB 3.0] 907060244071D'
[INFO] Reference clock 30.72 MHz
[INFO] Device name: LimeSDR-USB
[INFO] Reference: 30.72 MHz
[INFO] LMS7002M calibration values caching Disable
Setting up Rx stream with 1 channel(s)
Setting up Tx stream with 1 channel(s)
[INFO] RX LPF configured
Set Rx bandwidth to 2.50 MHz
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 5 
MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
[INFO] TX LPF configured
Set Tx bandwidth to 5.00 MHz
Available device sensors:
  - clock_locked
  - lms7_temp
Available sensors for Rx channel 0:
  - lo_locked
[INFO] Tx calibration finished
[INFO] Rx calibration finished
State of gain elements for Rx channel 0 (AGC not supported):
  - TIA: 9.00 dB
  - LNA: 30.00 dB
  - PGA: -4.00 dB
State of gain elements for Tx channel 0 (AGC not supported):
  - TIA: 9.00 dB
  - LNA: 30.00 dB
  - PGA: -4.00 dB
Rx antenna set to LNAL
Tx antenna set to BAND1
Set master clock rate to 30.72 MHz
[  0/2]: EARFCN 1299 Freq. 1814.90 MHz looking for PSS.
[INFO] RX LPF configured
Set Rx bandwidth to 2.50 MHz
[INFO] Rx calibration finished
[  1/2]: EARFCN 1300 Freq. 1815.00 MHz looking for PSS.
[INFO] RX LPF configured
Set Rx bandwidth to 2.50 MHz
[INFO] Rx calibration finished

Found 0 cells

Bye/

Iam not sure what is going wrong, maybe someone have an helpful tip.

Best regards

-- 
Jonah Mons

brown-iposs GmbH
Friedrich-Breuer-Straße 120
53225 Bonn

mailto:jonah.mons at brown-iposs.eu

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