fixed normalization for int16 in viterbi

srslte/include/srslte/utils/vector.h

@@ -163,7 +163,7 @@ SRSLTE_API void srslte_vec_max_fff(float *x, float *y, float *z, uint32_t len);
 
 /* quantify vector of floats or int16 and convert to uint8_t */
 SRSLTE_API void srslte_vec_quant_fuc(float *in, uint8_t *out, float gain, float offset, float clip, uint32_t len);
-SRSLTE_API void srslte_vec_quant_suc(int16_t *in, uint8_t *out, int16_t norm, int16_t offset, int16_t clip, uint32_t len); 
+SRSLTE_API void srslte_vec_quant_suc(int16_t *in, uint8_t *out, float gain, int16_t offset, int16_t clip, uint32_t len); 
 
 /* magnitude of each vector element */
 SRSLTE_API void srslte_vec_abs_cf(cf_t *x, float *abs, uint32_t len);

srslte/lib/fec/viterbi.c

@@ -287,11 +287,10 @@ int srslte_viterbi_decode_s(srslte_viterbi_t *q, int16_t *symbols, uint8_t *data
   int16_t max = -INT16_MAX; 
   for (int i=0;i<len;i++) {
     if (abs(symbols[i]) > max) {
-      max = symbols[i];
+      max = abs(symbols[i]);
     }
   }
-  
-  srslte_vec_quant_suc(symbols, q->symbols_uc, q->gain_quant/max, 127, 255, len);    
+  srslte_vec_quant_suc(symbols, q->symbols_uc, (float) q->gain_quant/max, 127, 255, len);    
   return srslte_viterbi_decode_uc(q, q->symbols_uc, data, frame_length);    
 }
 

srslte/lib/utils/vector.c

@@ -797,12 +797,12 @@ void srslte_vec_quant_fuc(float *in, uint8_t *out, float gain, float offset, flo
   }
 }
 
-void srslte_vec_quant_suc(int16_t *in, uint8_t *out, int16_t norm, int16_t offset, int16_t clip, uint32_t len) {
+void srslte_vec_quant_suc(int16_t *in, uint8_t *out, float gain, int16_t offset, int16_t clip, uint32_t len) {
   int i;
   int16_t tmp;
   
   for (i=0;i<len;i++) {
-    tmp = (int16_t) (offset + in[i]/norm);
+    tmp = (int16_t) (offset + in[i]*gain);
     if (tmp < 0)
       tmp = 0;
     if (tmp > clip)