A Novel Hybrid ARQ Scheme Based on Shift Column Permutation Bit Interleaving for OFDM Systems

In this paper, a novel hybrid ARQ scheme based on shift column permutation bit interleaving is proposed for OFDM systems. When a packet is requested for retransmission, we can use bit interleaving based on a shift column permutation to maximize channel diversity gain, which increases the system performance. The proposed scheme improves the performance of retransmission of OFDM systems by maximizing the distance between bits so that the decoding gain is maximized. Maximizing the channel diversity gain leads to the reduced number of retransmissions, resulting in lower retransmission delay and higher throughput. Through simulations in the IEEE 802.16e system environments, the proposed hybrid ARQ scheme is compared with the other conventional hybrid ARQ schemes.