Merge remote-tracking branch 'origin/vrtsim-taps-client' into integration_2025_w34 (!3407)

Taps client for vrtsim

The MR allows vrtsim to connect to the Raytracing Channel Emulator (CE later).
https://gitlab.eurecom.fr/oai/raytracing-channel-emulator

Additional Ubuntu packages required:

- libnanomsg-dev
- flatbuffers-compiler
- libflatbuffers-dev

Everything was tested on the same host. Follow the steps below to
successfully replicate:

1. Build nr-softmodem dependencies
2. Build nr-softmodem for (gNB, nrUE) with OAI_VRTSIM_TAPS_CLIENTset to ON.
3. Start the core network (Optional) follow this tutorial
4. Start the gNB

       sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf --gNBs.[0].min_rxtxtime 6 --device.name vrtsim --vrtsim.role server --vrtsim.timescale 0.5 --vrtsim.taps-socket ipc:///tmp/ru_socket_0

5. Start the nrUE

       sudo ./nr-uesoftmodem -C 3619200000 -r 106 --numerology 1 --ssb 516  --band 78 --device.name vrtsim --vrtsim.taps-socket ipc:///tmp/ue_socket_0

6. Start the CE Server, once the UE and gNB are running properly, so the
   server can connect to IPC sockets
7. Start CE client; the binaries can be downloaded from a pipeline run
   or from this link
8. Move the UE in the CE client to generate a new taps array and
   populate the taps in softmodems

openair1/SIMULATION/TOOLS/sim.h

@@ -77,6 +77,8 @@ typedef struct {
   struct complexd **a;
   ///interpolated (sample-spaced) channel impulse response. size(ch) = (n_tx * n_rx) * channel_length. ATTENTION: the dimensions of ch are the transposed ones of a. This is to allow the use of BLAS when applying the correlation matrices to the state.
   struct complexd **ch;
+  ///Same as above but single precision
+  struct complexf **ch_ps;
   ///Sampled frequency response (90 kHz resolution)
   struct complexd **chF;
   ///Maximum path delay in mus.