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中文摘要：
IEEE 802．16标准在物理层定义了多种可选的调制和编码方式，并可采用基于信道状态信息的自适应调制编码机制。本文提出一种新的适用于全球微波接入互操作网络的信噪比阈值区间可变式自适应调制编码机制，其自适应调制一编码模式不仅取决于物理层信道状态信息，还与高层多媒体服务流的目标误包率这一重要服务质量参数有关。与传统型和改进型自适应调制编码机制相比，信噪比阈值区间可变式自适应调制编码机制能够在满足各类业务目标误包率的同时获得较好的系统有效数据传输速率。
英文摘要：
IEEE 802.16 standards define 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 for by multimedia service flows from upper layer. Through performance evaluation, the results show that the scheme outperforms the traditional AMC scheme and its modified 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.
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