pccc 中文意思是什麼
pccc
解釋
后囊連續環形撕囊-
Turbo codes represent the new code structures, which consist of pccc ( parallel serially convolutional code ) and sccc ( serially concatenated convolutional code ). in this paper, the background of turbo codes are firstly introduced, which includes the base principle of error correction code 、 block code and convolutional code ; the principle of turbo code and the iterative decoding is secondly expanded ; the key decoding algorithm : a revised map algorithm and iterative decoding theory are detailed ; then, a new turbo code structure : hccc ( hybrid concatenated convolutional code ) is presented, and the capacity of this code method is analyzed, the average capacity upper bound is derived ; at last, this code is simulated on awgn ( additive white gaussian noise ) channel and rayleigh fading channel
本文首先介紹了turbo碼的背景知識，包括差錯控制的基本原理、分組碼和卷積碼；然後闡述了turbo碼的基本原理，包括turbo編譯碼器結構及迭代譯碼原理；較為詳細地描述了關鍵的譯碼演算法： ?種改進的最大后驗概率（ map ）譯碼演算法及迭代譯碼演算法；提出了一種新的turbo碼結構：混合turbo碼（混合級聯卷積碼） ；並用編碼性能聯合界分析方法對混合turbo碼進行了性能分析，得出了其平均性能上界；並在高斯白噪聲通道和瑞利衰落通道上分別作了一些應用研究及計算機模擬實驗。 -
The simulation result shows that : the performance of the proposed scheme is improved with comparison to pccc and sccc on both awgn channel and the rayleigh fading channel. in awgn channel, it is about same if the snr is low, if the snr is high, the improvement is 0. 2 ~ 0. 5db
結果表明：本方案的誤碼率性能與并行級聯碼和串性行級聯碼相比，在高斯白噪聲通道上，低信噪比時幾乎相同，高信噪比時有0 . 2 0 . 5db的改善。 -
The principle of coding and decoding for turbo codes, including pccc, sccc and hccc, are discussed ; based on the introduction of the modified and simplified map algorithms on awgn channel for turbo codes, multiplicative and additive siso decoding algorithms adapted to general iterative decoding are derived
論述了turbo碼（包括pccc 、 sccc和hccc ）的編譯碼原理，在介紹awgn通道上用於turbo譯碼的修正map譯碼演算法基礎上系統推導了適用於級聯碼迭代譯碼的通用siso譯碼演算法。
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