基于重要信息反馈的BATS码优化设计

Design of Improved BATS Codes Based on the Important Information Feedback

BATS码是一种结合喷泉码和网络编码技术的新型前向纠删码,能有效保证数据在多跳网络中的可靠传输。在传统BATS码编译码方案中,反馈信息没有得到高效利用,为提高BATS码的译码性能,提出了一种改进的基于重要信息反馈的BATS码编译码算法,其中,重要信息包由接收端和发送端共同选择用于下一轮编码;同时,对重要信息的编码包在中继节点采用网络编码算法进行再编码,以保证重要信息在接收端的可靠恢复。仿真结果表明,该方案相比传统的BATS码以及过去用于喷泉码的基于重要信息反馈的编译码方案,具有更好的译码性能。

BATS codes combining fountain codes and network coding are a new class of erasure codes which effectively guarantee the reliable transmission of packets in multi-hop network.However,conventional BATS codes do not make use of the feedback information.For improving the decoding performance of BATS codes,we design an improved BATS codes encoding and decoding algorithm based on the important information.And the important information is selected by the source node combined with the destination node for the next coding process.Furthermore,the coded packets from the important information are recoded at the intermediate nodes for the reliable recovery of the important information at the destination node.Simulation results show that the proposed improved scheme achieves better decoding performance compared with the conventional BATS code and the traditional limited feedback used in fountain code.