convolution on strongest taps rather than weakest

configure

@@ -1,140 +0,0 @@
-#!/bin/bash
-#/*
-# * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
-# * contributor license agreements.  See the NOTICE file distributed with
-# * this work for additional information regarding copyright ownership.
-# * The OpenAirInterface Software Alliance licenses this file to You under
-# * the OAI Public License, Version 1.1  (the "License"); you may not use this file
-# * except in compliance with the License.
-# * You may obtain a copy of the License at
-# *
-# *      http://www.openairinterface.org/?page_id=698
-# *
-# * Unless required by applicable law or agreed to in writing, software
-# * distributed under the License is distributed on an "AS IS" BASIS,
-# * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# * See the License for the specific language governing permissions and
-# * limitations under the License.
-# *-------------------------------------------------------------------------------
-# * For more information about the OpenAirInterface (OAI) Software Alliance:
-# *      contact@openairinterface.org
-# */
-#set -xv 
-function print_help() {
-    echo "
-By default, it creates a build directory and creates building files in this directory
-The external packages needs to be installed before   
-See doc/BUILD.md for more details 
-The simplest starting point is to:
-install asn1c from source (in doc/BUILD.md: you can also just install asn1c like this ...)
-Then, running ./configure will fail on the packages missing in your Linux, you can install by trial/error
-              
-Possible options are all cmake available options, and OpenAirInterface specific options
-  *** input/output directory
-  --build-dir
-    The building directory (instead of 'current directory'/build)
-  The input file is the current directory file CMakeLists.txt
-
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-    cmake method to use Ninja or other build tools (default to standard make)
-  -DCMAKE_C_COMPILER=gcc-4.2 -DCMAKE_CXX_COMPILER=g++-4.2
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-    predefined cmake options to the compiles (Debug adds -O0 for example)
-  -DAVX512=OFF
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-  -DSANITIZE_ADDRESS=True -DSANITIZE_UNDEFINED=True -DSANITIZE_THREAD=True
-    gcc/clang sanitizers 
-
-  *** memory dimensioning
-  -DUE_EXPANSION=True
-    Change the maximum managed UEs in one Cell for 4G and 5G nodeB for 40 to 256
-  -DNB_ANTENNAS_RX=xxx
-    limit the number of managable RX antennas at runtime
-  -DNB_ANTENNAS_TX=xxx
-    limit the number of managable TX antennas at runtime
-
-
-  *** Features generation options ***
-  -DOAI_xxx=ON
-    Enable specific RF boards or simulation
-    xxx can be: USRP BLADERF LMSSDR IRIS SIMU AW2SORI AERIAL ETHERNET FHI72 FHI72_MPLANE
-    WLS (WLS for nfapi instead of regular sockets interface)
-  -DENABLE_xxx=ON
-    enable specific add-on
-    xxx can be
-      TELNETSRV
-      ENBSCOPE UESCOPE NRSCOPE IMSCOPE IMSCOPE_RECORD
-      OAI_IQPLAYER
-      WEBSRV
-      LDPC_CUDA LPDC_AAL LDPC_XDMA
-  -DE2_AGENT=ON
-     Enable the E2 Agent
-
-  *** Tracing options **
-  -DENABLE_LTTNG=ON
-    use lttng as trace output
-  -DT_TRACER=ON
-    Enable T tracer tool instead of regular trace output
-  -DT_TRACER_GUI
-    Adds a GUI to T tracer
-  -DUE_DEBUG_TRACE=ON
-    Adds more traces in UE
-  -DENABLE_VCD_FIFO=ON
-    enable VCD trace tool (deprecated)
-  -DTRACE_ASN1C_ENC_DEC=ON
-    Enable asn1c internal traces via OAI logging system (huge trace)
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-  
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-     more details in doc/physical-simulators.md
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-  -DENABLE_TESTS
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---build-lib <libraries>
-   Build optional shared library, <libraries> can be one or several of $OPTIONAL_LIBRARIES or \"all\"
--h | --help
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-}
-
-args=()
-BUILD_DIR=build
-until [ -z "$1"         ]
-do         
-    case "$1" in
-        -d | --build-dir)
-            BUILD_DIR=$2   
-            shift 2;;
-        -h | --help)
-            print_help
-            exit 1;;
-        *)
-            args+=("$1")
-            shift;;
-    esac
-done
-
-cur_dir=$PWD
-mkdir -p "$BUILD_DIR" || exit
-pushd "$BUILD_DIR" || exit 
-cmake -DT_TRACER=OFF "${args[@]}" "$cur_dir"
-if [ -f build.ninja ] ; then
-    cmd=ninja
-else
-    cmd="make -j$(nproc)"
-fi
-popd
-echo "all:" > Makefile
-echo -e "\\tcd $BUILD_DIR; $cmd" >> Makefile
-

openair1/SIMULATION/TOOLS/channel_pipeline.c

@@ -46,17 +46,35 @@ void do_convolution_and_noise(int nb_tx,
 {
   const int batch_size = 4000;
   cf_t work_buffer[batch_size] __attribute__((aligned(64)));
+
+  // Pre-scan: build strong tap indices for each TX antenna
+  int strong_tap_indices[nb_tx][channel_length] __attribute__((aligned(32)));
+  int num_strong_taps[nb_tx] __attribute__((aligned(32)));
+
+  for (int tx_ant = 0; tx_ant < nb_tx; tx_ant++) {
+      num_strong_taps[tx_ant] = 0;
+      for (int l = 0; l < channel_length; l++) {
+          if (squaredMod(channel[tx_ant][l]) >= THRES) {  // Strong tap
+            strong_tap_indices[tx_ant][num_strong_taps[tx_ant]] = l;
+            num_strong_taps[tx_ant]++;
+          }
+      }
+    }
+
   for (int batch_start = job_index * batch_size; batch_start < num_samples; batch_start += batch_size * num_jobs) {
     int batch_end = min(batch_start + batch_size, num_samples);
     if (noise_power > 0.0f) {
       get_noise_vector((float *)work_buffer, batch_size * 2);
     }
+
     for (int i = batch_start; i < batch_end; i++) {
       float rx_r = 0.0f;
       float rx_i = 0.0f;
 
       for (int tx_ant = 0; tx_ant < nb_tx; tx_ant++) {
-        for (int l = 0; l < channel_length; l++) {
+        // Iterate only over strong taps
+        for (int tap_idx = 0; tap_idx < num_strong_taps[tx_ant]; tap_idx++) {
+          int l = strong_tap_indices[tx_ant][tap_idx];  // Get actual tap delay index
           int idx = i + (channel_length - 1) - l;
           c16_t in_sample;
           if (idx < num_samples_tx_sig0) {

openair1/SIMULATION/TOOLS/channel_pipeline.h

@@ -4,6 +4,7 @@
 
 #ifndef _CHANNEL_CONVOLUTION_H_
 #define _CHANNEL_CONVOLUTION_H_
+#define THRES 0.03
 
 #ifdef __cplusplus
 extern "C" {

openair2/RRC/NR/tests/CMakeLists.txt

@@ -4,7 +4,7 @@ add_executable(rrc_bearers_test rrc_bearers_test.c ../rrc_gNB_radio_bearers.c ${
 add_dependencies(tests rrc_bearers_test)
 add_test(NAME rrc_bearers_test COMMAND rrc_bearers_test)
 target_include_directories(rrc_bearers_test PRIVATE ./common/utils/ds common/utils/LOG)
-target_link_libraries(rrc_bearers_test PRIVATE ds alg asn1_e1ap asn1_lte_rrc_hdrs asn1_nr_rrc_hdrs LOG ${T_LIB})
+target_link_libraries(rrc_bearers_test PRIVATE ds alg asn1_e1ap asn1_lte_rrc_hdrs asn1_nr_rrc_hdrs LOG T)
 target_compile_definitions(rrc_bearers_test PRIVATE ENABLE_TESTS)
 
 add_executable(rrc_cell_management_test rrc_cell_management_test.c)