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| Advanced Hybrid ARQ Technique Employing a Signal Constellation Rearrangement Based on 64-QAM |
| Gu Xin-yu; Wang Yi-chen;Yu Xiao-bo; Niu Kai; Lin Jia-ru; Wu wei-ling |
| School of Information Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China |
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Abstract An advanced Hybrid ARQ (HARQ) technique applicable to QAM is presented in this paper, which employs signal constellation rearrangement to average the variations in bit reliabilities caused by QAM signal constellation. The presented scheme employs 4 constellation mapping rules for 64-QAM, and can achieve a noticeable gain in HARQ performance as well as a reduction in complexity compared to the existing constellation rearrangement scheme.
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Received: 31 May 2004
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2005, Vol. 27 
