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中文摘要：
介绍了一种基于256-QAM调制的混合ARQ（HARQ）技术，该技术通过星座图重排，降低了多级调制造成的比特之间可靠性的差异，能够显著提高HARQ的性能。首先，提出了标准的符合格雷映射关系的256-QAM星座图后．并通过选取另外3个星座图进行重排，构成基于256-QAM的4星座图影射规则。仿真结果表明该方法最终降低复杂度并提高HARQ性能，这将对未来256-QAM的应用（例如HSDPA、HSUPA）提供较大的参考价值和现实意义。
英文摘要：
In this paper, we introduce a Hybrid ARQ （HARQ） technique based on 256-QAM. By employing signal constellation rearrangement, the diversity of bit reliabilities caused by M-QAM signal constellation can be reduced, thus the corresponding performance of HARQ could be enhanced. We present the standard signal constellation （Gray Mapping） of 256-QAM, in which 3 signal constellations are rearranged to derived 4 types of constellation mapping rules of 256-QAM. The simulation results show that the proposed technique performs a noticeable gain in HARQ performance with a lower complexity. This will be favorable to the application of 256-QAM （for example, in HSDPA and HSUPA）, and provide great value in reference and practical application.
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