基于高度包保护的优化融合编码算法

The algorithm based on the combination of LT code and network coding for the protection of high-degree packets

为了提升水声网络中现有的基于喷泉码与网络编码融合传输方案的性能,减少LT编码包经过中继节点网络编码后度分布的变化,本文提出一种基于高度包保护的优化融合编码算法(LTNC-HP)。LTNC-HP算法通过在各个中继节点增加高度保护传输算法,解决融合编码时存在的不理想覆盖问题,有效减少了传输的信息量。同时LTNC-HP算法在中继节点编码时加入同度包优先选择机制,提高各个中继节点编码信息的有效性,增加了网络中数据包的多样性。仿真结果表明,与改进前的融合编码方案相比,LTNC-HP算法传输信息的有效性显著提高,且传输冗余大幅度降低。

LTNC-HP, a novel optimized recoding algorithm for the protection of high-degree packets in underwater acoustic sensor networks, is proposed. The proposed algorithm improves the performance of a data transmission scheme and is based on the combination of LT codes with network coding. Moreover, the algorithm decreases the variation in the degree distribution of LT coding packets after passing the network coding at the relay point. By introducing a high-degree protection transmission algorithm at each intermediate node, the proposed algorithm can resolve the imperfect coverage of the input symbols and decrease the amount of data transmission. Moreover, the priority selection mechanism for the same degree packet is added in LTNC-HP when coding at each relay node, significandy improving the efficiency of coding information at each relay node and increasing the diversity of the data packets in the network. Simulation results showed that compared with existing encoding algorithms, LTNC-HP improves the effectiveness of the information transmission and decreases transmission redundancy.