单向信道的信息可靠传输机制研究

Research on mechanism of reliable information transmission over unidirectional channel

提出了两级FEC的机制来解决单向信道的信息可靠传输的问题。数据包级FEC(第一级)通过添加冗余数据包来恢复传输过程中数据包的丢失。比特级FEC(第二级)通过添加冗余比特来纠正数据在传输过程中比特差错。鉴于包头信息是数据包级FEC的关键,提出数据包包头FEC机制来尽量保证包头信息的正确。提出的方案能很好地恢复丢失的数据包,特别是连续数据包的丢失,能很好地纠正比特差错。

This paper proposes a two stage Forward Error Correction（FEC） to solve the problem of reliable information transmission over undirectional channel.Packet-level FEC（stage one） is added across packets to correct packet losses due to congestion and route disruption.Bit-Level FEC（stage two） is then added to both application packets and stage-one FEC pack-ets to recover bits errors from the link layer.Because the packet header information is very important to packet-level FEC,packet header FEC is presented to guarantee the correctness of packet header information.The results show the present scheme can effectively recover the lost packets,especially the continuous lost packets,and significantly reduce the bit errors.