多跳分集系统中一种新的基于无比率编码的跨层方案

研究了多跳分集系统中由于链路的不可靠传输直接应用实用网络编码存在差错的扩 散和传播问题。提出了一种新的基于无比率编码的跨层方案，该方案利用无比率编码的纠错 能力及实用网络编码码字随机特性，控制了输入链路的差错扩散和传播。结果表明，在满足 每条链路误包率一定的情况下，该方案获得了较好的差错性能。进一步分析了为了使每条 链路达到给定的误包率，无比率编码在不同信噪比下的冗余。

Cross-layer design based on rateless codes in multihop diversity systems

The influence of error propagation caused by practic al network coding in multihop diversity systems is studied when the links are un reliable. The cross-layer design based on rateless codes is proposed, which utilizes the e rror correction of rateless codes and random characteristic of practical network coding to control the error propagation. Simulation results show that the propo sed scheme has lower packet error rate, compared with a single channel. To achie ve the predefined packet error rate of a single channel, the redundancy of the r ateless codes is also analysed under different signal-to-noise-ratio conditions.