3 . we adopt the convolution coding to be the channel coding 3 .在信道編碼部分采用了卷積編碼。
Channel coding has two kinds : block code and convolution code 信道編碼分為分組碼和卷積碼兩大類。
Because of good performance , convolution code is applied more abroad in satellite communications and wireless communication 卷積碼由于其良好的性能更是廣泛應用于衛(wèi)星和無線通信之中。
Turbo code , also named parallel concatenated convolution code , was presented by c . berrou , a . glavieux and p . thifimajshiwa in icc ' 93 Turbo碼,又稱并行級聯(lián)卷積碼( pccc ) ,是由c . berrou等在1993年icc會議上提出的。
The tcq algorithm takes advantage of convolution code , and enlarges the euclidean distances among quantized data by expanding data dimensions Tcq算法充分利用了卷積碼的特性,采用信號空間擴展的方法來增大量化信號的歐式距離,從而達到提高量化性能的目的。
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 卷積碼的譯碼算法有序列譯碼和viterbi譯碼兩大類, viterbi譯碼算法由于其簡單、性能優(yōu)異等特性得以廣泛應用。
To ensure the reliable transmission of voice and data , the channel encoding method which the digital trunking communication system uses is crc ( circle redundant code ) & rcpc ( rate - compatible punctured convolution code ) & interleave 為了保障話音和數(shù)據(jù)的可靠傳輸,數(shù)字集群系統(tǒng)采用的信道編碼方案為crc + rcpc +交織。
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譯碼算法在1967年由viterbi提出,經(jīng)證明它是卷積碼譯碼得最大似然譯碼算法,具有優(yōu)異的譯碼性能。
Based on the ( 3 , 1 , 5 ) convolution code in digital trunking system , this paper first studied the decoding depth of the convolution code and fund out the right decoding depth for digital trunking system , then proposed a modified viterbi decoding algorithm 本文以數(shù)字集群中所用的( 3 , 1 , 5 )卷積碼為基礎(chǔ),首先對卷積碼的解碼深度進行了研究,得出適合數(shù)字集群系統(tǒng)的解碼深度,然后提出了一種卷積碼的viterbi譯碼的改進算法。
Is - 95 , a wireless digital cellular standard based on cdma ( code division multiple access ) , adopts convolution code as its channel coding part . the third generation wireless cellular standard adopts turbo coding , which stems from convolution coding , as its channel coding part 以cdma ( codedivisionmultiplexaccess )為基礎(chǔ)的數(shù)字蜂窩標準is - 95采用卷積碼作為其糾錯方案;第三代數(shù)字蜂窩無線通信標準也采用并行級聯(lián)卷積碼( turbo碼)作為其糾錯方案。