基于256-QAM星座图重排HARQ技术  

Hybrid ARQ Technique Employing a Signal Constellation Rearrangement Based on 256-QAM

作　　者：庞斌[1] 戴宪华[1] 张涵[1] 陈嫦娟 廖建强 肖舟 

机构地区：[1]中山大学信息科学与技术学院,广东广州510006 [2]中国网通(集团)有限公司广东省分公司,广东广州510630

出　　处：《无线电通信技术》2009年第2期12-14,39,共4页Radio Communications Technology

基　　金：国家自然基金项目(60772132);国家自然基金-广东省联合基金项目(U0635003);广东省科技计划项目(2007-B010200055);广东省教育部产学研项目(2007A090302116)

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。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.

关 键 词：256-QAM 星座图重排 HARQ HSDPA TURBO 

分 类 号：TN929.5[电子电信—通信与信息系统]