Address generation polynomial and permutation matrix for DVB-T2 1k 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 1k mode. R(i)[8] = R(i-1)[0] xor R(i-1)[4] 0:8 / B1:7/B / 2:6 / B3:5/B / 4:0 / B5:1/B / 6:2 / B7:3/B / 8:4 Simulations have shown that the proposed system provides good separation of adjacent symbols and hence good noise immunity.