说明：  网络编码的一个扩展，主要用在NS2仿真网络中，提出网络编码扩展的实现方案，主要包括架构调整和编码模块实现两部分
(An extension of network coding is mainly used in the NS2 simulation network, the proposed extension of network coding to achieve the program, including adjustments and coding module structure of two parts)