First , this paper analyses a bicm model and the bicm _ id model based on combination of convolutional code and 8psk modulation , and introduces the principle and key technique 本文分析了一个基于卷积码和8psk调制相结合的bicm模型和相应的bicm _ id模型,介绍了它们的原理和其中的关键技术。
Common telemetry coding and decoding methods , such as rs coding and decoding , convolutional coding and decoding , are introduced , applied in satellite data and realized by programming 论述了常用的遥测系统的编码与解码方式,并通过编程实现了对卫星数据的rs编码译码以及卷积码编码译码。
But for the same reason , it have n ' t the same diversity feature as space - time block code , as well as it have n ' t the same error correction capability as convolutional code or trellis code modulation 由于空时格码兼顾了分集和信道编码，导致其分集特性不如空时分组码，纠错能力不如卷积码和格形编码调制。
Concerning channel coding , it ’ s for tens of years from the first convolutional code to turbo code recommended by the consultative committee for space data systems ( ccsds ) 在信道编码方面,从最初的卷积码到现在ccsds ( consultativecommitteeforspacedatasystems )建议下的turbo码已经经历了几十年的时间。
Conventionally , dtv systems adopt coding schemes such as rs or convolutional codes , or concatenated codes , where the error correction performance is still quite far away from the shannon limit 通常的，数字电视系统采用的信道编码方案为rs码或卷积码，或二者的级联码，它的纠错性能与香农极限相比，仍有一定的距离。
However , the sequential decoding algorithm is not fully developed because of its complication and limited range of application , which lead to relatively few materials particularly in board 而卷积码的序列译码方法因为其硬件复杂度高和应用范围小,并不十分流行,相关的参考文献也很少,尤其在国内,相关的研究非常少。
We discuss the bit error rate of the convolutional code , turbo code encoder and decoder theory as well as the performance in awgn channel and rician channel , and present the result of simulation 讨论了rs与卷积码级联的误码率问题, turbo码的编译码原理及其在awgn信道和rician信道中的性能,并给出了相应的仿真结果。
There are two decoding schemes for convolution code , such as sequence decoding algorithm and viterbi algorithm . because of simplicity 、 excellent performance , viterbi decoding algorithm is abroad applied 卷积码的译码算法有序列译码和viterbi译码两大类, viterbi译码算法由于其简单、性能优异等特性得以广泛应用。
The viterbi decoding algorithm , proposed in 1967 by viterbi , and it ’ s proved that viterbi decoding algorithm is the maximum likelihood decoder algorithm of convolution code and it has excellent decode performance Viterbi译码算法在1967年由viterbi提出,经证明它是卷积码译码得最大似然译码算法,具有优异的译码性能。
Convolutional coding is a coding scheme often employed in deep space communications and recently in digital wireless communications . it offers an alternative to block codes for transmission over a noisy channel 卷积码被运用于卫星通信和无线通信系统中，它提供了一种不同于分组码的在噪声信道下传输信息的一种编码方案。
