Random data generation
Cyclic Prefix insertion
Figure 4.1: Simulation Setup
Figure 4.2: Channel Encoding Setup
Figure 4.3: Channel Decoding Setup
The scrambler performs randomization of input data on each burst on each allocation to avoid long sequence of continuous ones and zeros. This is implemented with a Pseudo Random Binary Sequence (PRBS) generator which uses a 15stage shift register with a generator polynomial of 1+x14+x15 with XOR gates in feedback con iguration as shown in figure 4.4. The implemented scrambler complies with the initialization process as specified in section 188.8.131.52 of the standard .