共查询到19条相似文献,搜索用时 140 毫秒
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介绍了一种短Turbo码交织器的设计方法 ,给出了一个短交织器的设计例子 ,其仿真结果表明 ,这种交织器对于短Turbo码很有效。在Turbo码帧长度处于 10 0到 10 0 0时 ,与Turbo码使用块交织和伪随机交织相比 ,误码性能有了大幅度的提高。 相似文献
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Turbo码随机交织器的设计与实现 总被引:2,自引:1,他引:1
Turbo码中交织器性能的优劣将直接影响到Turbo码的译码性能.在分析交织器的设计准则和类型的基础上,利用m序列的遍历性,设计了一种基于m序列的随机交织器,并给出了基于FPGA的硬件实现方案.仿真结果表明,该随机交织器在实现输入数据随机分布方面性能优异,并降低了Turbo码的译码延迟. 相似文献
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在Turbo码理论中,交织器占有重要地位。论文分析了Turbo码的编译码方案,阐明了交织器在Turbo码设计中的重要作用,提出了几种交织器的设计实现方法,并在仿真的基础上对其性能进行了分析。 相似文献
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本文分析了交织器在Turbo码中的重要作用,提出了一种新交织器的设计方法,即隔行螺旋交织器.该交织器在螺旋交织器上做了简单的改进,易于实现.计算机仿真结果表明,该交织器可以获得的良好的误比特率性能. 相似文献
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分析了交织器在Turbo码中的作用,指出了现有的几种交织器的缺点.设计了两种新型的基于块交织的S随机交织器和基于伪随机交织的S随机交织器.仿真结果表明,与现有的几种交织器相比,这两种交织器在Turbo码译码迭代次数及延时方面性能更好,更适合于分布式视频编码系统. 相似文献
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Combined turbo codes and interleaver design 总被引:1,自引:0,他引:1
The impact of the distance spectrum and interleaver structure on the bit error probability of turbo codes is considered. A new turbo code design method for Gaussian channels is presented. The proposed method combines a search for good component codes with interleaver design. The optimal distance spectrum is used as the design criterion to construct good turbo component codes at low signal-to-noise ratios (SNRs). In addition, an interleaver design method is proposed. This design improves the code performance at high SNR. Search for good component codes at low SNR is combined with a code matched interleaver design. This results in new turbo codes with a superior error performance relative to the best known codes at both low and high SNR. The performance is verified by both analysis and simulation 相似文献
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Hokfelt J. Edfors O. Maseng T. 《Selected Areas in Communications, IEEE Journal on》2001,19(5):838-847
The performance of a turbo code can be severely degraded if no trellis termination is employed. This paper investigates the implications of the choice of trellis termination method for turbo codes, and explains the origin of the performance degradation often experienced without trellis termination. An efficient method to derive the distance spectrum of turbo codes for different trellis termination methods is presented. Further, we present interleaver design rules that are tailored to each termination method. Using interleavers designed with these restrictions, we demonstrate that the performance difference between various termination methods is very small, including no trellis termination at all. For example, we demonstrate a turbo code with a 500-bit interleaver that exhibits no sign of an error floor for frame error rates as low as 10-8, even though no trellis termination is employed 相似文献
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Interleaver design for turbo codes 总被引:6,自引:0,他引:6
Sadjadpour H.R. Sloane N.J.A. Salehi M. Nebe G. 《Selected Areas in Communications, IEEE Journal on》2001,19(5):831-837
The performance of a turbo code with short block length depends critically on the interleaver design. There are two major criteria in the design of an interleaver: the distance spectrum of the code and the correlation between the information input data and the soft output of each decoder corresponding to its parity bits. This paper describes a new interleaver design for turbo codes with short block length based on these two criteria. A deterministic interleaver suitable for turbo codes is also described. Simulation results compare the new interleaver design to different existing interleavers 相似文献
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Turbo码的一种并行译码方案及相应的并行结构交织器研究 总被引:1,自引:0,他引:1
Turbo码基于MAP算法译码的递推计算所引入高的译码延迟限制了Turbo码在高速率数据传输中的应用。为了解决这个问题,该文提供了一种降低译码延迟的并行译码方法。并行处理方案的实现必须通过适当的交织以避免两个译码器对外信息读写的数据冲突。该文在分析了任意无冲突交织方式可能性的存在之后,给出了设计任意地适用于并行处理方案的S随机交织器的方法。仿真验证了并行译码方案的误比特性能。 相似文献
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Recent Advances in Turbo Code Design and Theory 总被引:1,自引:0,他引:1
Vucetic B. Yonghui Li Perez L.C. Fan Jiang 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2007,95(6):1323-1344
The discovery of turbo codes and the subsequent rediscovery of low-density parity-check (LDPC) codes represent major milestones in the field of channel coding. Recent advances in the design and theory of turbo codes and their relationship to LDPC codes are discussed. Several new interleaver designs for turbo codes are presented which illustrate the important role that the interleaver plays in these codes. The relationship between turbo codes and LDPC codes is explored via an explicit formulation of the parity-check matrix of a turbo code, and simulation results are given for sum product decoding of a turbo code. 相似文献