Address generation polynomial and permutation matrix for DVB-T2 32k OFDM sub-carrier mode (de)interleaver

摘要

The standards for DVB-T/H specify (de)interleaving symbols to/from OFDM subcarriers. It further specifies an interleaving address generator that comprises a linear feedback shift register and a permutation matrix operating on the shift register bits. The DVB-T/H specifications include 3 modes with approximately 2, 4 and 8 thousand sub-carriers, and interleaver address generators for these are known. A proposed DVB-T2 specification includes three new modes with 1, 16 and 32 thousand sub-carriers. The invention specifies a polynomial to be implemented in the LFSR and a permutation matrix for the 32k mode. R(i)[13]=R(i-1)[0] xor R(i-1)[1] xor R(i-1)[2] xor R(i-1)[12] 0:7 / 1:13 / 2:3 / 3:4 / 4:9 / 5:2 / 6:12 / 7:11 / 8:1 / 9:8 / 10:10 / 11:0 / 12:5 / 13:6 Simulations have shown that the proposed system provides good separation of adjacent symbols and hence good noise immunity.