Extract nr_common and nr_phy_common libs. Also add unit tests for nr_common

openair1/PHY/nr_phy_common/CMakeLists.txt

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+add_library(nr_phy_common src/nr_phy_common.c)
+target_include_directories(nr_phy_common PUBLIC inc/)

openair1/PHY/nr_phy_common/inc/nr_phy_common.h

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+/*
+ * 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
+ */
+
+#ifndef __NR_PHY_COMMON__H__
+#define __NR_PHY_COMMON__H__
+#include "PHY/impl_defs_top.h"
+#include "PHY/TOOLS/tools_defs.h"
+
+void freq2time(uint16_t ofdm_symbol_size, int16_t *freq_signal, int16_t *time_signal);
+void nr_est_delay(int ofdm_symbol_size, const c16_t *ls_est, c16_t *ch_estimates_time, delay_t *delay);
+unsigned int nr_get_tx_amp(int power_dBm, int power_max_dBm, int total_nb_rb, int nb_rb);
+#endif

openair1/PHY/nr_phy_common/src/nr_phy_common.c

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+/*
+ * 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
+ */
+
+#include "nr_phy_common.h"
+
+void freq2time(uint16_t ofdm_symbol_size, int16_t *freq_signal, int16_t *time_signal)
+{
+  const idft_size_idx_t idft_size = get_idft(ofdm_symbol_size);
+  idft(idft_size, freq_signal, time_signal, 1);
+}
+
+void nr_est_delay(int ofdm_symbol_size, const c16_t *ls_est, c16_t *ch_estimates_time, delay_t *delay)
+{
+  freq2time(ofdm_symbol_size, (int16_t *)ls_est, (int16_t *)ch_estimates_time);
+
+  int max_pos = delay->delay_max_pos;
+  int max_val = delay->delay_max_val;
+  const int sync_pos = 0;
+
+  for (int i = 0; i < ofdm_symbol_size; i++) {
+    int temp = c16amp2(ch_estimates_time[i]) >> 1;
+    if (temp > max_val) {
+      max_pos = i;
+      max_val = temp;
+    }
+  }
+
+  if (max_pos > ofdm_symbol_size / 2)
+    max_pos = max_pos - ofdm_symbol_size;
+
+  delay->delay_max_pos = max_pos;
+  delay->delay_max_val = max_val;
+  delay->est_delay = max_pos - sync_pos;
+}
+
+unsigned int nr_get_tx_amp(int power_dBm, int power_max_dBm, int total_nb_rb, int nb_rb)
+{
+  // assume power at AMP is 20dBm
+  // if gain = 20 (power == 40)
+  int gain_dB = power_dBm - power_max_dBm;
+  double gain_lin;
+
+  gain_lin = pow(10, .1 * gain_dB);
+  if ((nb_rb > 0) && (nb_rb <= total_nb_rb)) {
+    return ((int)(AMP * sqrt(gain_lin * total_nb_rb / (double)nb_rb)));
+  } else {
+    LOG_E(PHY, "Illegal nb_rb/N_RB_UL combination (%d/%d)\n", nb_rb, total_nb_rb);
+    // mac_xface->macphy_exit("");
+  }
+  return (0);
+}