In chapter 5, we define quantum binary symmetric channels via the invariance of fidelity under unitary transformation of input density operators 第五章通過量子保真度(fidelity)在輸入信號的幺正變換下的不變性定義了量子二進制對稱信道。
In the new model, the legitimate partners can control the error bit rate of the eavesdropper's channel by adjusting their virtual binary symmetric channels . when our new model is implemented, the problem of receiving synchronization of the partners will not occur 在該模型中,通信雙方使用虛擬的二元對稱信道來控制竊聽方接收信道的誤比特率,而且使用該模型也不存在信息接收同步的問題。
This paper can put into four parts ? this first part is the description and theoretical analyses of source coding, which focus on the research of optimizing equal quantization ? the second part presents the theoretical description of joint channel-source coding, which focus on the research of combined channel-source coding o the third part is about the application of combined channel-source coding to two different channel models, binary symmetric channel and cdma channel o in this part, two different coding designs are given according to different characters of these two channels ? and the last part is the description of simulation of combined channel-source coding ? most of my work are about two parts, one is to find the most appropriate quantization steps and centroid points of separate channel-source coding, another is to simulate the combined channel-source coding ? comparing the simulation results of separate channel-source coding and combined channel-source coding, the characters of joint channel-source coding are given 本論文可以分成四部分:第一部分給出了信源編碼的基本概念和理論分析,重點放在最優(yōu)均勻量化編碼的研究方面;第二部分給出了信道?信源聯(lián)合編碼的原理敘述,重點放在復合式信道?信源編碼的分析研究上;第三部分將信道-信源聯(lián)合編碼原理應用在兩種噪聲信道上:離散無記憶信道和cdma信道,并根據(jù)兩種信道的不同特點詳細描述了兩種相應的編碼設計方案;第四部分給出了復合式信道-信源編碼的仿真結(jié)果以及對結(jié)果的相應分析。
The columns and rows are constrained by each other . the simulations over binary symmetric channe ( lbsc ) and gilbert-elliott channel ( gec ) shows the performance is great improved, especially over burst error channel peak signal to noise ratio ( psnr ) is improved more . it is tried to be used in wireless communication system 仿真結(jié)果表明,采用行列交替約束的約束維特比譯碼以后,性能得到較大的提升,尤其在突發(fā)錯誤信道中,傳輸?shù)膱D像經(jīng)乘積編碼進行信道編碼與譯碼后峰值信噪比有明顯的提高。