一种改进的网络编码单播重传方案  

An improved unicast retransmission scheme based on network coding

作　　者：邱莎[1] 李世银[1] 李宗艳[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008

出　　处：《工矿自动化》2014年第8期62-66,共5页Journal Of Mine Automation

摘　　要：针对现有无线单播重传存在有效性低、频谱效率低等问题,提出了一种改进的网络编码单播重传方案。该方案的基本原理:在重传阶段,发送端将首次传输有误的数据包与新的数据包分别以不同的速率编码后进行合并,然后再将对应的混合数据包发送到接收端;接收端将收到的重传数据包与首次传输的数据包进行软合并及译码处理,以恢复出所传输的原始数据包信息,同时被合并的2个数据包在重传过程中共享能量、空间和时间。仿真结果表明,相比于传统的数据包独立自动请求重传方案,该网络编码单播重传方案的误比特率更低,有效提高了无线单播链路的传输效率。In view of problems such as low efficiency and low spectrum efficiency existed in wirelessunicast retransmission,an improved unicast retransmission scheme based on network coding was proposed.The basic principle of the scheme is that transmitting terminal encodes initial incorrect transmission data packet and new data packet by different rate respectively in retransmission stage,combines the data packets,and transmitting terminal sends the hybrid information to the corresponding receiver.The receiver uses soft combining method to combine the retransmitted data packet with the initial packet during the previous transmission stage and then makes a decoding process in order to recover the original information,at the same time,the combined two packets will share energy,space and time in the retransmission process.The simulation results show that performance of error bit rate of the proposed scheme is lower than the traditional automatic repeat request scheme,and the proposed scheme improves transmission efficiency of wireless unicast link effectively.

关 键 词：无线单播链路 网络编码 递归系统卷积码 自动重传请求 

分 类 号：TD655[矿业工程—矿山机电]