Adaptive interleaving for bandwidth-efficient OFDM systems

We proposed a novel interleaving technique, namely adaptive interleaving, which can break the bursty channel errors more effectively than traditional block interleaving. This new scheme resequences the transmitted symbols adaptively according to the instantaneous subcarrier channel state information sequence. In this way, the bursty errors introduced by the channel can be broken more effectively, thus a better BER performance can be achieved. This technique is well-suited to OFDM systems because the CSI values of the whole frame could be estimated at once when transmitted symbols are framed in the frequency dimension. In this paper, we consider applying the technique to high bandwidth-efficiency systems. It is shown that the proposed scheme achieves significant SNR gains compared with the regular block interleaving scheme. In addition, the SNR gains is larger than the gains in BPSK OFDM systems.