After the analysis of viterbi decoding , we conclude that the adverse effect of impulsive noise on recognition is that the impulsive noise introduces unreliable 通过对viterbi译码过程的分析,得出冲激噪声对语音识别的影响在于其引入了不可靠的概率差距。
Density evolution theory is specified and is applied to the analysis on the threshold of decoding , through which guidance can be provided to optimize irregular ldpc codes 阐述了密度进化理论,并分析了译码过程中存在的阈值现象。然后介绍了密度进化理论在ldpc码优化方面的应用。
We began with algorithm and parameter analyze ; then come to the architecture of the decoding and the function of each module ; at the end is the implementation of decoding in the fpga 首先是维特比译码算法和参数分析:然后是译码的结构和各个模块所要实现的工作;最后是译码过程在fpga中的具体实现。
The statistical characteristic of extrinsic information from component decoders is discussed . based on it , ? it is explained that the related curves of input - output snr could be used to measure the performance and convergence of iterative decoding ; ? two types of turbo iterative stopping criteria are designed ; ? the methods to updating snr estimation in the process of iterative decoding is provided ; ? a way to implement synchronization of carrier phase by serial concatenation scheme is devised 在分析迭代译码输出外部信息的统计特性基础上?考察了迭代译码器输入输出snr关系曲线,并说明它可以作为衡量迭代译码性能和收敛性的工具; ?设计了两类新的turbo迭代译码停止准则; ?提出了在迭代译码过程中更新snr估计的方法;国防科学技术大学研究生院学位论文设计了利用外部信息统计量实现载波相位同步的串行级联方案。