Convolutinal coding is a coding scheme often employed in digital wireless communications . viterbi decoders are used to decode convolutional codes . viterbi decoders employed in digital wireless communications are complex and dissipate large power 卷积码是一类重要的前向纠错编码,它编码简单,易于实现最佳译码,是当今无线数字通信系统的一个十分重要的组成部分。
4 . the error correcting scheme adopted by mpeg - 2 in dvb system has been fully studied , the feasible error correcting scheme applied in the up - link of dvb system is put forward , and the decoder module used in mpeg - 2 system is designed 详细研究了dvb系统中mpeg - 2所选用的纠错码方案;并且结合实际项目,提出了适用于dvb上行信道的可行的纠错编码方案,设计出了mpeg - 2流中的译码器模块。
Then we use lifting scheme improve wavelet analysis methods and proposed a kind of digital watermark algorithm based on error - correcting coded which is a method of communication theory and is to correct watermark signal 然后在这一水印算法的基础上,使用小波提升技术来改进小波分析方法,再使用通信理论中的纠错编码方法对水印信号进行纠错控制,并提出了一种基于纠错编码的数字水印算法。
Channel coding is based on more recent developments by the scientific community : low - density parity - check codes are adopted . low - density parity - check codes were first introduced by gallager in 1960 . but due to the calculating effort in implementing , they were mostly ignored 其性能如此优异的一个重要原因是采用了当今纠错编码技术发展的最新成果? ?低密度校验( ldpc , low - densityparity - check )码。
Every class endues a binary code , then a set of svms are used to solve the multiple binary problems . the generalization performance of ecc - svm is analyzed , which is determined by code length , hamming distance , coding sequence and margins of svms 本文提出了基于纠错编码的svm多类分类算法( ecc - svm ) ,并分析了ecc - svm的推广能力与编码长度、码间汉明距离、编码顺序以及分类间隙等之间的关系,给出了这种关系的数学描述。
The fourth part considered how to improve system performance by adopting transmission diversity in flat fading channels . in the traditional space - time trellis code design , the space diversity , time diversity and channel code are concerned together to get best space diversity , time diversity and code gain 传统的空时格码把空间分集、时间分集和前向纠错编码联合设计,以n摘要获得最大的空间分集、时间分集、信道编码的增益。
Through more than twenty years ’ research , associative neural networks have been developed into an important class of artificial neural networks . and they have been widely applied to many fields such as optimizing computation , error correction coding , data compression , and pattern recognition 经过二十多年的研究, am神经网络已经发展成为一类重要的人工神经网络,并已被广泛地应用于优化计算、纠错编码、数据压缩和模式识别等领域。
This paper is mainly considered : 1 ) how joint coded modulation transmitter is designed based on the iterative decoder . 2 ) the combination of ldpc code with bit - interleaved coded modulaton . 3 ) the optimization of two dimensional signal constellations in joint coded modulation with iterative decoder 本文研究工作的重点在于: 1 )迭代译码对联合编码调制方案设计的影响; 2 )新的纠错编码和比特交织编码调制的有机结合; 3 )高阶星座的最优化问题。
In the aspect of communication in lunar ground , it uses the improved frame basing on hdlc , and adopts turbo as error - correction coding . as for lunar surface , because of the good channel , it uses the standard hdlc , and for the high speed video information , turbo is also used . 月地信道方面,选择了基于hdlc的改进帧格式,并采用turbo码作为纠错编码;月表方面由于信道性能良好,采用标准hdlc的帧格式,对于高速率的图像信息同时应用turbo码作为信道编码。
It has put forward a kind of method of self - adaptation based on motion characteristic to correcting error code . finally , based on the rtp protocol , real - time transmission of video and audio data is realized with software , and a bandwidth control algorithm based on rtp is introduced . the research results of this paper can be used in the long - distance education , video conference , videophone , video real - time control , and various kinds of communication systems 接着讨论了纠错编码,采用rs编码作为前向纠错码,提出了一种基于运动特征的自适应误码掩盖方法,并采用rtp协议进行视音频数据的实时传输及带宽控制,本文的研究成果可以直接用于远程教育、视频会议、可视电话、视频监控等各种通信系统,具有较大的研究价值及广泛的实用价值。