针对IPv4协议的容错解码算法研究

在易错网络中传输IP (因特网协议)数据包时,除了网络拥塞之外,信道误码也容易导致数据包丢失。丢包对信源恢复会造成较大影响。为了降低误码导致的丢包率,该文研究了IPv4协议解码的可靠性问题,分析了IPv4(因特网协议版本4)协议各字段之间的相关性,建立了IPv4协议容错解码的理论模型,利用最大后验概率推导出容错解码的准则。在该基础上提出一种以分段方式估计协议字段的算法,实验结果表明该算法大大增强了IPv4协议解码的纠错能力。

Algorithmic Research on Error Resilient Decoding for IPv4 Protocol

When transmitting Internet protocol (IP) packets over error-prone networks,bit error can cause packet loss besides network congestion.Packet loss makes a strong impact on source recovery.For the sake of decreasing packet loss ratio,we consider the problem of error resilient decoding for internet protocol version 4 (IPv4).The correlation between fields in IP packet header is analyzed,a mathematical model for error resilient IPv4 decoding,and the error resilient decoding criterion using maximum a posterior (MAP) is deduced.Based on the decoding is constructed criterion,a novel error resilient decoding algorithm is proposed for IPv4 in segmenting form.Experimental results show that the algorithm can enhances the abilities of correcting errors significantly.