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(hào)的幺正變換下的不變性定義了量子二進(jìn)制對(duì)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(duì)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(diǎn)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(diǎn)放在復(fù)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(yīng)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(diǎn)詳細(xì)描述了兩種相應(yīng)的編碼設(shè)計(jì)方案;第四部分給出了復(fù)合式信道-信源編碼的仿真結(jié)果以及對(duì)結(jié)果的相應(yīng)分析。
A binary symmetric channel (or BSC) is a common communications channel model used in coding theory and information theory. In this model, a transmitter wishes to send a bit (a zero or a one), and the receiver receives a bit.