CAJ | 학술논문

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.
이용수자분천편마가유효제고다도중계전수적효솔.제출일충기우수자분천마적중계다도전수궤제,종량방면개선중계전발성능:매량개중계조성중계대,채용선전성좌조제기술획득신호공간분집증익,단불강저신도적빈보효솔;근거개진적합병산법대중계전발적분천편마수거포진행선성조합,획득수거포분집효과,제고신도이용솔,축단전수시간.방진결과현시,실현수거포분집화신호공간분집후,다도중계전수효솔현저제고,전수시간유소축단.
@@@@In multi-hop relay transmission, digital fountain codes can greatly improve transmission efciency. 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 efciency. 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 efciency of the multi-hop relay transmission is improved consider-ably, and transmission time reduced.