1. 北京大学信息科学技术学院,北京,100871
2. 华中科技大学电信系,湖北,武汉,430074
3. 北京大学信息科学技术学院北京,100871
4. 华中科技大学电信系湖北武汉,430074
纸质出版:2003
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李建平, 王宏远. 基于短帧交织的Turbo码编码器研究[J]. 电子学报, 2003,31(3):444-447.
LI Jian-ping, WANG Hong-yuan. Research on Turbo Encoders Based on Short Frame Interleavers[J]. Acta Electronica Sinica, 2003, 31(3): 444-447.
本文分析了Turbo码编码器及其输出码字的组成原理
基于使输出码字最小汉明重量最大化和使最小汉明重量输出码字出现的概率最小化的原则
结合结构化交织器和随机交织器的优点
提出了一种伪随机的结构化反块交织器
并进一步提出了采用双伪随机反块交织器的Turbo码编码器方案.该方案有效的增大了Turbo码输出码字的最小汉明距离
同时避免了Turbo码边缘效应且具有伪随机性
因此
可有效的提高系统的纠错性能.仿真实验结果显示
该方案在短帧传输的条件下有着最佳的综合性能.特别是在信噪比高时
采用该方案与采用其它交织器的Turbo码方案相比
在提高系统的可靠性上具有明显的优势.
Turbo codes with random interleavers are capable of achieving better error correcting performance than that obtained with structured interleavers at low SNR and the situation is in general the other way round at high SNR.To get better performance under the condition of various signal-to-noise ratios
this paper proposed a novel pseudo-random reverse block interleaver
which efficiently avoids the edge effect and combines the advantages of random interleavers and structured interleavers.Built in two proposed interleavers with different starting points
a novel Turbo encoder produced herein
capable of making Turbo codes obtains an increment in the minimum Hamming weight and consequently obtain a decrease at bit error rate.Simulation results show that the error-correcting performance of Turbo codes with it is superior to those obtained with other encoders on the whole when the short frame is transmitted.In particular
for clean channel
Turbo codes with the proposed encoder are capable of achieving much better error correcting performance than before.
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