P_3 puncturing scheme

pages/02.part-1/03.physical-layer/docs.md

@@ -242,7 +242,6 @@ The puncturing scheme \(P_2\) is defined by its partial puncturing matrix:
 The linearized representations are:
 
 ```
-
 P1 = [1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1,
       1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1,
       0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1]
@@ -250,6 +249,25 @@ P1 = [1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1,
 P2 = [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0]
 ```
 
+One additional puncturing scheme \(P_3\) is used in the packet mode. The puncturing scheme is defined by its puncturing matrix:
+
+\(
+\begin{align}
+  P_3 = & \begin{bmatrix}
+  1 & 1 & 1 & 1 \\
+  1 & 1 & 1 & 0
+  \end{bmatrix}
+\end{align}
+\)
+
+The linearized representation is:
+
+```
+P3 = [1, 1, 1, 1, 1, 1, 1, 0]
+```
+
+### Interleaving
+
 For interleaving a Quadratic Permutation Polynomial (QPP) is used. The polynomial \(\pi(x)=(45x+92x^2)\mod 368\) is used for a 368 bit interleaving pattern QPP. See appendix sec-interleaver for pattern.
 
 To avoid transmitting long sequences of constant symbols (e.g. 010101…), a simple algorithm is used. All 46 bytes of type 4 bits shall be XORed with a pseudorandom, predefined stream. The same algorithm has to be used for incoming bits at the receiver to get the original data stream. See decorr-seq for sequence.