Bit Level Adaptive Interleaving for WiMAX

Based on the works of S-W Lei and V.K.N. Lau, we propose a novel adaptive interleaving scheme for the application in orthogonal frequency division multiplexing (OFDM) systems. The new scheme has improved the original one in the following two aspects: (1) We have derived the equivalent bit level channel state information thus the symbol level interlever is changed to the bit level; (2) We have modified the quasi-closed-loop method which has much signaling overhead and is sensitive to the feedback errors. The simulation results show that the proposed scheme has better performance, less feedback overhead and is more robust to the feedback errors.