diff --git a/libs/util.py b/libs/util.py
index b2f3e50..f077358 100644
--- a/libs/util.py
+++ b/libs/util.py
@@ -25,7 +25,7 @@ def convert_mat_to_vector(
     width, length = mat.shape
     for i in range(width):
         for j in range(length):
-            if mat[i, j] <= NOISE_FLOOR:
+            if mat[i, j] <= NOISE_FLOOR + 5:
                 continue
             rx_locs.append([(i + 0.5) * block_size, (j + 0.5) * block_size])
             rx_rsses.append(mat[i, j])