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In this paper,four schemes of Hybrid Automatic-Repeat-Request(HARQ)for Orthogonal Frequency DivisionMultiplexing(OFDM)systems are evaluated when they are used in different channel environments.The AccumulativeCorrect Packet Reception Rate(ACPRR)performance of four HARQ schemes is compared in order to verify which ARQschemes are more suitable for different mobility OFDM systems.Computer simulation results show that the maximal ratiocombining frequency diversity ARQ scheme and type Ⅲ HARQ with frequency diversity is more suitable for low mobilityOFDM system.However the type Ⅲ HARQ without frequency diversity is more suitable for high mobility OFDM systembecause of the remarkable time diversity which reduces the required retransmission number to about 2 at the ACPRR of0.96.
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 in order to verify which ARQschemes are more suitable for different mobility OFDM systems. Computer simulation results show that the maximal ratiocombining frequency diversity ARQ scheme and type III HARQ with frequency diversity is more suitable for low mobilityOFDM system. Host the type III HARQ without frequency diversity is more suitable for high mobility OFDM systembecause of the remarkable time diversity which reduces the required retransmission number to about 2 at the ACPRR of 0.96.