[srsran-users] LTE 4x4 MIMO with n310

[Shkodrov, Yanislav]

Hello,

I have configured eNb to use 4 TX Ports in transmission mode 3. UE is configured to have 4 RX antennas. TX/RX gain is set to 50dB.
To transmit/receive LTE signal two USRP n310 devices are used. The TX/RX channels of USRP n310's are connected directly via cable and 30 dB attenuator.
I have updated srsenb/src/enb_cfg_parser.cc to allow configuration "4 TX ports in transmission mode 3". In eNb/UE logs I can see that 4 TX ports/ 4 RX antennas are used. UE can successfully camp on LTE cell when 25 PRBs are used but serving cell quality is not good and CRC errors are observed.
Do you have any hint what I might be missing in the configuration? Or, are there further srsRAN SW changes required to support used case UE camp on eNb in transmission mode 3 and use 4TX/4RX in DL?

Best Regards
Yanislav


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