Convolutinal coding is a coding scheme often employed in digital wireless communications . viterbi decoders are used to decode convolutional codes . viterbi decoders employed in digital wireless communications are complex and dissipate large power 卷积码是一类重要的前向纠错编码,它编码简单,易于实现最佳译码,是当今无线数字通信系统的一个十分重要的组成部分。
Integrated service digital network isdn - signalling system no . 7 ; isdn user part isup version 4 for the international interface - part 21 : anonymous call rejection supplementary service itu - t recommendation q . 731 , clause 4 1993 本标准是室内电缆的导则，它规定了对绞和星绞多芯对称电缆的定义和要求。这种电缆用于数字通信系统，如综合业务数字网isdn ，局域网和数据通信系统。
Unceasing enhancement which along with the computer technology , thenetwork technology , the communication rapid development and the peopleliving standard and need , took their foundation the digitalcommunication system also is facing a higher request 网友解答：随着计算机技术、网络技术、通信技术的迅速发展和人们生活水平及需要的不断提高，作为它们基础的数字通信系统也面临着更高的要求。
Unceasing enhancement which along with the computer technology , thenetwork technology , the communication rapid development and the peopleliving standard and need , took their foundation the digitalcommunication system also is facing a higher request 5月24日12 : 40随着计算机技术、网络技术、通信技术的迅速发展和人们生活水平及需要的不断提高，作为它们基础的数字通信系统也面临着更高的要求。
Synchronization is the commander of every digital communication system , without it the system is unable to work orderly and correctly . a five - tuple of time - frequency diversity is adopted to guarantee that the synchronization signal be retrieved reliably in the receiver 同步是任何数字通信系统有序工作的“指挥棒” ，本研究采用5重时频分集的方法，使得在接收端能够可靠地恢复出系统工作所需要的同步信号。
Personal computer , as an intelligent terminal , is developing persistently . the universal serial bus ( usb ) interface structure brings a technical revolution to pc peripheral apparatus . the usb interface technology is also be used in the terminal of telecommunication system introduced in the thesis 作为智能终端的pc机近年来发展迅猛，尤其是通用串行总线( usb )的出现，给pc机的外设带来了一场技术革命，并被广泛用于无线数字通信系统终端。
5 kinds , 6 kinds of cable products are used in the digital communication system extensively , including the computer network , integrated service digital network ( isdn ) ( isdn ) , data communication system , etc . , connect up in the level in the comprehensive wiring system , perpendicular and workspace 5类、 6类电缆产品广泛用于数字通信系统中，包括计算机网络、综合业务数字网（ isdn ） ，数据通信系统等，作为综合布线系统中的水平、垂直和工作区布线。
Secondly , we used the dsp assembly language to perform the carrier phase tracking based on a digital processing system . this system is designed according to the idea of software radio . this digital processing system realized the intermediate frequency digitalization . with the diverse configuration of the digital upconverter and digital downconverter in this system , it can carry through many signal modulation modes . and because the carrier phase trac king is performed using software in dsp , it brings great convenience to this system and makes this system available in many digital communication systems 在该数字处理平台上可通过加载不同的软件对平台中的数字上下变频器进行灵活的配置以实现不同的数字调制解调制度，通过将载波的相位跟踪工作放在dsp软件中进行带来了很大的灵活性，能够适用于当前许多种数字通信系统。
In term of the probability of communication system and perturbance theory , the model of the effect of srs to error bit ratio in communication system is established . through the way numerical of simulation , limitations to srs to error bit ration of communication system and input optical power , the number of channel etc are discussed . the obtained conclusion has definitely reference value to the design of practical communication 根据数字通信系统几率的特性和微扰理论，建立了受激喇曼散射对通信系统误码率影响的理论模型，并通过数值模拟讨论了受激喇曼散射对系统误码率、最大输入功率和信道数等的限制，获得了一些对实际光通信系统设计有参考价值的结论。
In the point of - information theory ; - the - baseband binary pulse amplitude modulated ( pam ) signal transmission , via turning the nonlinear receiver ' s parameters , is studied over an additive white gaussian noise ( awgn ) channel . it is demonstrated that the channel capacity of binary communication systems , for a given signal added noise , can be maximized by optimal designed receivers . this new form of sr is referred to as psr in a broad sense 本文研究并设计了含有双稳态随机共振系统作为一个接收装置的基带数字通信系统，在加性高斯白噪声信道中，通过研究这个非线性接收器的性能，发现了数字信号传输中存在的参数调节随机共振现象?信道容量随着系统响应速度的增加具有一个共振峰值，并对这种非线性现象发生的基本机理进行了解释。
