采用数字喷泉码和旋转星座图的多跳中继传输机制-应用科学学报.PDF

第 31 卷 第 2 期 应 用 科 学 学 报 Vol. 31 No. 2 2013年3月 JOURNAL OF APPLIED SCIENCES — Electronics and Information Engineering Mar. 2013 DOI: 10.3969/j.issn.0255-8297.2013.02.003 采用数字喷泉码和旋转星座图的多跳 中继传输机制 雷维嘉， 刘慧锋， 谢显 中 重庆邮电大学 移动通信技术重庆市重点实验室，重庆 400065 摘摘摘 要要要：：： 利用数字喷泉编码可有效提高多跳 中继传输 的效率. 提 出一种基于数字喷泉码 的中继多跳传输机制，从 两方面改善中继转发性能：每两个 中继组成中继对，采用旋转星座调制技术获得信号空间分集增益，但不降低信道 的频谱效率；根据改进 的合并算法对 中继转发的喷泉编码数据包进行线性组合，获得数据包分集效果，提高信道利 用率，缩短传输时 间. 仿真结果显示，实现数据包分集和信号空间分集后，多跳 中继传输效率显著提高，传输时 间 有所缩短. 关键词：多跳 ；中继传输 ；数字喷泉码 ；旋转星座 ；数据包分集 中图分类号：TN925 文章编号：0255-8297(2013)02-0123-07 Multi-hop Relay Transmission Scheme Using Digital Fountain Code and Rotated Constellation LEI Wei-jia, LIU Hui-feng, XIE Xian-zhong Chongqing Key Laboratory of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China Abstract: In multi-hop relay transmission, digital fountain codes can greatly improve transmission efficiency. A multi-hop relay transmission scheme based on fountain codes is proposed, which improves data relay per- formance in two ways: 1) Two relay nodes form a relay pair, and by using rotated constellation modulation, signal space diversity gain is obtained without sacrificing bandwidth efficiency. 2) An improved encoded pack- ets linear combination algorithm is used to rebuild the encoded packets by the relay to realize packet diversity. Simulation results show that transmission efficiency of the multi-hop relay transmission is improved consider- ably, and transmission time reduced. Keywords: multi-hop, relay transmission, digital fountain code, rotated constellations, p