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提出无线网络中机会式网络编码与代数网络编码相结合的重传方案,采用代数网络编码策略来解决非关联特性包的重传问题.该方案分两个阶段,第一阶段采用机会网络编码恢复关联包的丢包;第二阶段采用代数网络编码对非关联包进行包恢复.代数网络编码阶段把机会式网络编码恢复关联包后的矩阵作为代数网络编码的初始信息矩阵,依据该矩阵的满秩分解的结果筛选出合适的编码矩阵,再删除该矩阵中的关联包所对应的列使得非关联包的转移矩阵的行列式不为零,接收端依据转移矩阵一次可恢复多个非关联包.该方案的优势在于充分利用机会网络编码编解码容易,与代数网络编码一次可恢复多个非关联丢包的优势,最大化编码增益,降低了重传开销.仿真结果证明该重传方案优于典型机会式网络编码的重传性能.
This paper proposes a retransmission scheme combining opportunistic network coding and algebraic network coding in wireless networks and adopts algebraic network coding strategy to solve the retransmission problem of non-associated characteristic packets.The scheme consists of two phases, the first phase adopts opportunistic network coding recovery The second phase adopts the algebraic network coding to recover the non-associated packets.Algebraic network coding phase of the opportunistic network coding to recover the associated packets as the initial algebraic network coding matrix, according to the matrix is full The result of rank decomposition screened the appropriate coding matrix, and then delete the columns corresponding to the associated packet in the matrix so that the determinant of the non-associated packet transfer matrix is not zero, the receiver can recover multiple non-associated packets according to the transfer matrix The advantage of this scheme is that it is easy to make full use of opportunistic network coding and decoding and the advantages of using algebraic network to recover multiple uncorrelated packet losses at one time to maximize the coding gain and reduce the retransmission overhead.The simulation results show that the retransmission scheme is superior Retransmission performance in typical opportunistic network coding.