diff --git a/openair1/PHY/CODING/nrPolar_tools/nr_polar_decoder.c b/openair1/PHY/CODING/nrPolar_tools/nr_polar_decoder.c
index 18db8a01fb..8fe115b23a 100644
--- a/openair1/PHY/CODING/nrPolar_tools/nr_polar_decoder.c
+++ b/openair1/PHY/CODING/nrPolar_tools/nr_polar_decoder.c
@@ -40,9 +40,9 @@
 #include "assertions.h"
 
 int8_t polar_decoder(double *input,
-					 uint32_t *out,
-					 t_nrPolar_params *polarParams,
-					 uint8_t listSize)
+                     uint32_t *out,
+                     const t_nrPolar_params *polarParams,
+                     uint8_t listSize)
 {
   //Assumes no a priori knowledge.
   uint8_t ***bit = nr_alloc_uint8_3D_array(polarParams->N, (polarParams->n+1), 2*listSize);
@@ -299,7 +299,7 @@ int8_t polar_decoder(double *input,
 
 int8_t polar_decoder_dci(double *input,
                          uint32_t *out,
-                         t_nrPolar_params *polarParams,
+                         const t_nrPolar_params *polarParams,
                          uint8_t listSize,
                          uint16_t n_RNTI) {
   uint8_t ***bit = nr_alloc_uint8_3D_array(polarParams->N, (polarParams->n+1), 2*listSize);
diff --git a/openair1/PHY/CODING/nrPolar_tools/nr_polar_defs.h b/openair1/PHY/CODING/nrPolar_tools/nr_polar_defs.h
index a44a08a701..c2e9fd9381 100644
--- a/openair1/PHY/CODING/nrPolar_tools/nr_polar_defs.h
+++ b/openair1/PHY/CODING/nrPolar_tools/nr_polar_defs.h
@@ -138,22 +138,22 @@ typedef struct nrPolar_params t_nrPolar_params;
 
 void polar_encoder(uint32_t *input,
                    uint32_t *output,
-                   t_nrPolar_params *polarParams);
+                   const t_nrPolar_params *polarParams);
 
 void polar_encoder_dci(uint32_t *in,
                        uint32_t *out,
-                       t_nrPolar_params *polarParams,
+                       const t_nrPolar_params *polarParams,
                        uint16_t n_RNTI);
 
 void polar_encoder_fast(uint64_t *A,
                         void *out,
                         int32_t crcmask,
                         uint8_t ones_flag,
-                        t_nrPolar_params *polarParams);
+                        const t_nrPolar_params *polarParams);
 
 int8_t polar_decoder(double *input,
-					 uint32_t *output,
-                     t_nrPolar_params *polarParams,
+                     uint32_t *output,
+                     const t_nrPolar_params *polarParams,
                      uint8_t listSize);
 
 uint32_t polar_decoder_int16(int16_t *input,
@@ -163,21 +163,21 @@ uint32_t polar_decoder_int16(int16_t *input,
 
 int8_t polar_decoder_dci(double *input,
                          uint32_t *out,
-                         t_nrPolar_params *polarParams,
+                         const t_nrPolar_params *polarParams,
                          uint8_t listSize,
                          uint16_t n_RNTI);
 
 void generic_polar_decoder(const t_nrPolar_params *pp,
-						   decoder_node_t *node);
+                           decoder_node_t *node);
 
 void applyFtoleft(const t_nrPolar_params *pp,
-				  decoder_node_t *node);
+                  decoder_node_t *node);
 
 void applyGtoright(const t_nrPolar_params *pp,
-				   decoder_node_t *node);
+                   decoder_node_t *node);
 
 void computeBeta(const t_nrPolar_params *pp,
-				 decoder_node_t *node);
+                 decoder_node_t *node);
 
 void build_decoder_tree(t_nrPolar_params *pp);
 void build_polar_tables(t_nrPolar_params *polarParams);
diff --git a/openair1/PHY/CODING/nrPolar_tools/nr_polar_encoder.c b/openair1/PHY/CODING/nrPolar_tools/nr_polar_encoder.c
index 27c062c217..e61b3dff9b 100644
--- a/openair1/PHY/CODING/nrPolar_tools/nr_polar_encoder.c
+++ b/openair1/PHY/CODING/nrPolar_tools/nr_polar_encoder.c
@@ -43,7 +43,7 @@
 
 void polar_encoder(uint32_t *in,
                    uint32_t *out,
-                   t_nrPolar_params *polarParams) {
+                   const t_nrPolar_params *polarParams) {
   if (1) {//polarParams->idx == 0 || polarParams->idx == 1) { //PBCH or PDCCH
     /*
     uint64_t B = (((uint64_t)*in)&((((uint64_t)1)<<32)-1)) | (((uint64_t)crc24c((uint8_t*)in,polarParams->payloadBits)>>8)<<polarParams->payloadBits);
@@ -154,7 +154,7 @@ void polar_encoder(uint32_t *in,
 
 void polar_encoder_dci(uint32_t *in,
                        uint32_t *out,
-                       t_nrPolar_params *polarParams,
+                       const t_nrPolar_params *polarParams,
                        uint16_t n_RNTI) {
 #ifdef DEBUG_POLAR_ENCODER_DCI
   printf("[polar_encoder_dci] in: [0]->0x%08x \t [1]->0x%08x \t [2]->0x%08x \t [3]->0x%08x\n", in[0], in[1], in[2], in[3]);
@@ -251,9 +251,9 @@ void polar_encoder_dci(uint32_t *in,
 #endif
 }
 
-static inline void polar_rate_matching(t_nrPolar_params *polarParams,void *in,void *out) __attribute__((always_inline));
+static inline void polar_rate_matching(const t_nrPolar_params *polarParams,void *in,void *out) __attribute__((always_inline));
 
-static inline void polar_rate_matching(t_nrPolar_params *polarParams,void *in,void *out) {
+static inline void polar_rate_matching(const t_nrPolar_params *polarParams,void *in,void *out) {
 
   // handle rate matching with a single 128 bit word using bit shuffling
   // can be done with SIMD intrisics if needed
@@ -411,7 +411,7 @@ void polar_encoder_fast(uint64_t *A,
                         void *out,
                         int32_t crcmask,
                         uint8_t ones_flag,
-                        t_nrPolar_params *polarParams) {
+                        const t_nrPolar_params *polarParams) {
   //  AssertFatal(polarParams->K > 32, "K = %d < 33, is not supported yet\n",polarParams->K);
   AssertFatal(polarParams->K < 129, "K = %d > 128, is not supported yet\n",polarParams->K);
   AssertFatal(polarParams->payloadBits < 65, "payload bits = %d > 64, is not supported yet\n",polarParams->payloadBits);