Performance of Hybrid ARQ Schemes for OFDM Systems

摘要

In this paper, four schemes of Hybrid Automatic-Repeat-Request (HARQ) for Orthogonal Frequency Division Multiplexing (OFDM) systems are evaluated when they are used in different channel environments. The Accumulative Correct Packet Reception Rate (ACPRR) performance of four HARQ schemes is compared in order to verify which ARQ schemes are more suitable for different mobility OFDM systems. Computer simulation results show that the maximal ratio combining frequency diversity ARQ scheme and type Ⅲ HARQ with frequency diversity is more suitable for low mobility OFDM system , However the type Ⅲ HARQ without frequency diversity is more suitable for high mobility OFDM system because of the remarkable time diversity which reduces the required retransmission number to about 2 at the ACPRR of 0.96.