A novel adaptive hybrid ARQ scheme for wireless ATM networks

This paper describes the design and performance of a novel adaptive hybrid ARQ scheme using concatenated FEC codes for error control over wireless ATM networks. The wireless links are characterized by higher, time-varying err or rates and burstier error patterns in comparison with the fiber-based lin ks for which ATM was designed. The purpose of the hybrid ARQ scheme is to p rovide a capability to dynamically support reliable ATM-based transport ove r wireless channels by using a combination of our ARQ scheme (called SDLP) and the concatenated FEC scheme. The key ideas in the proposed hybrid ARQ s cheme are to adapt the code rate to the channel conditions using incrementa l redundancy and to increase the starting code rate as much as possible wit h the concatenated FEC, maximizing the throughput efficiency. The numerical results show that our proposed scheme outperforms other ARQ schemes for al l SNR values.