[thesis] Add BP text and error floor figure

src/thesis/acronyms.tex

@@ -8,6 +8,21 @@
     long=belief propagation
 }
 
+\DeclareAcronym{nms}{
+    short=NMS,
+    long=normalized min-sum
+}
+
+\DeclareAcronym{spa}{
+    short=SPA,
+    long=sum-product algorithm
+}
+
+\DeclareAcronym{llr}{
+    short=LLR,
+    long=log-likelihood ratio
+}
+
 \DeclareAcronym{sc}{
     short=SC,
     long=spatially coupled