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PHY procedures for SRS MIMO

Roberto Louro Magueta requested to merge develop-SRS-MIMO into develop
  • Fix SRS sequence generation for multiple ports (sequence validated with COTS);
  • Fix SRS mapping for multiple ports;
  • Fixes in channel estimation, channel interpolation and SNR per RB computation based on SRS up to 4 antenna ports (validated in RFSim, where several channel matrices were tested, and the estimates were as expected);
  • Fix SRS scheduling at gNB and UE when there are Dedicated BWPs;

Future work: Fix some procedures on RRC and/or MAC to work with COTS-UE for nrofSRS_Ports = NR_SRS_Resource__nrofSRS_Ports_ports2. This configuration only worked with OAI-UE. COTS-UE does not decode NR_UL_DCI_FORMAT_0_1 for this configuration. The number of DCI bits depends on the SRS configuration. For nrofSRS_Ports = NR_SRS_Resource__nrofSRS_Ports_port1, the communication with COTS-UE continues working well.

Edited by Roberto Louro Magueta

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