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IEEE 802.16 standards defi ne manifold modulation and coding modes, and could use the Adaptive Modulation and Coding (AMC) scheme according to Channel State Information (CSI). This paper proposes a novel AMC scheme with alterable Signal-to-Noise Ratio (SNR) threshold intervals which could apply to Worldwide Interoperability for Microwave Access (WiMAX). In the scheme, each modulation-coding mode is not only decided by CSI from physical (PHY) layer, but also related to an important parameter of the quality of service (QoS), namely Target Packet Error Ratio (TPER) which is provided by multimedia service fl ows from upper layer. Through performance evaluation, the results show that the scheme outperforms the traditional AMC scheme and its modifi ed version. The proposed AMC scheme produces higher effective data transfer rate and at the same time it satisfies the TPER requirements of each class of multimedia service flow.
IEEE 802.16 standards defi ne manifold modulation and coding modes, and could use the Adaptive Modulation and Coding (AMC) scheme according to Channel State Information (CSI). This paper proposes a novel AMC scheme with alterable Signal-to-Noise Ratio threshold intervals which could apply to Worldwide Interoperability for Microwave Access (WiMAX). In the scheme, each modulation-coding mode is not only decided by CSI from physical (PHY) layer, but also related to an important parameter of the quality of service Through performance evaluation, the results show that the scheme outperforms the traditional AMC scheme and its modifi ed version. The proposed AMC scheme produces higher effective data transfer rate and at the same time it satisfies the TPER requirements of each class of multimedia service flow.