摘要
扩展窗喷泉码中的高优先级数据包具有保护性能较差的缺点。通过对传统扩展窗喷泉码的与或树分析,得到一种简单而有效的提高其不等差错保护性能的优化方案,即对各窗口中度分布函数进行改进的方案。仿真结果表明:在不同码长情况下,优化的扩展窗喷泉码方案能够更加有利于高优先级数据包的传输,进一步确保高优先级数据的不等差错保护性能,同时在源数据完全恢复时,低优先级数据的译码性能平均提升了3.8%~13.3%。
In EWF（Expanding Window Fountain） codes, MIB（More Important Bit） data has a poor performance in UEP（Unequal Error Protection）. By And-Or Tree analyzing of traditional EWF codes, a simple and effective optimization scheme to improve the UEP property of MIB is acquried, which modifies degree distribution functions in each window. Simulation results indicate that the optimized scheme can transmit MIB data even faster under the condition of different code lengths, ensure the UEP property of MIB data, and improve the decoding property of LIB data by 3.8% - 13.3% in average when decoding successfully.
作者
李亚芳
张卫党
LI Ya-fang ZHANG Wei-dang(School of Information Engineering, Zhengzhou University, Zhengzhou Henan 450001, China)
出处
《通信技术》
2017年第4期603-608,共6页
Communications Technology
关键词
LT码
度分布
扩展窗喷泉码
不等差错保护
LT codes
degree distribution
expanding window fountain code
unequal error protection
