基于Fourier矩阵的无线广播重传策略

针对随机网络编码重传的缺陷, 将Fourier矩阵和随机网络编码相结合, 提出一种半固定编码系数的广播重传方案FMWBR。利用广播源节点和接收节点双方已知的Fourier矩阵的行向量作为编/解码向量, 保证接收节点接收到的重传包具有完全可解性。理论分析表明, FMWBR增强了无线传输的安全性、提高了网络的鲁棒性、减少了包头开销。仿真测试结果表明, FMWBR跟其他几种重传策略相比, 有效地减少了平均传输次数, 节省了带宽消耗, 提高了网络吞吐量。

Wireless broadcasting retransmission scheme based on Fourier matrix

In order to solve the defects of retransmission for random network coding, this paper presented a retransmission approach FMWBR based on local random coding parameter which was combined with Fourier matrix and random network coding. A row vector of the Fouier matrix shared with a source node and a receiver node actd as a coding vector and a decoding vector, which ensured the retransmission packets' solvability. The head of retransmission packets only included the number of the row vector in the Fourier matrix. The theoretic analysis shows that TMWBR enhances the security of wireless transmission, improves the robustness of networks and reduces the cost of packets' head. The simulation results indicate that comparing with traditional scheme, the scheme effectively reduces the average number of transmission and the overhead of networks, improves networks' throughput.