At present , our country does n ' t establish its own security standard with independent property right for hfc network . if we directly use the imported security system , our hfc nerworks never have real security 目前我国还没有独立的具有自主产权的hfc网络数据传输系统安全标准，把引进的安全系统作为解决我国hfc网络安全问题的方案根本无安全可言。
The data exchange system build in an hierarchical architecture which comprise of two layers , the upper is the creation and manipulation layer for the application data , and the lower is the bottom data transport layer 该系统将数据交换分成应用单据生成、处理，以及底层数据传输两层来实现，同时讨论了通过拨号专网技术对底层edi数据传输系统进行替换的平滑升级方案。
After review the developing history of well logging data transmission system and ofdm ( orthogonal frequency division multiplexing ) technology , the principle , design theory and characteristic of ofdm has been studied in detail 通过了解测井数据传输系统的发展以及ofdm ( orthogonalfrequencydivisionmultiplexing )技术的研究成果，详细论述了ofdm的原理、设计思想和性能特点。
Then , the paper designed a single - component transducer data acquisition system . its electromagnetic induction couple for energy transmission and ray - electricity couple for signal transmission were still used in multi - component transducer data acquisition system 然后介绍了单维力传感器的数据传输系统，其中的电感耦合传输能量、光电耦合传输信号是多维力传感器信号传输的基础。
During the designing of data transmission system , we should assure the dependability of transmission , descend the transmittal power and decrease the volume . therefore , using error control technology in base - band processing unit is consumedly important 数据传输系统的设计,要保证传输的可靠性,降低通信设备的发射功率,减小体积,因此在基带处理单元中进行差错控制设计具有非常重要的意义。
Chapter 1 sketches bandwidth wireless data transmission system , puts forward full digital modulation and demodulation and construction of software wireless and fpga . to design the burst mode 64 qam demodulator in the special applications 第一章简述了宽带无线数据传输系统，提出了全数字调制与解调的方案，可以采用软件无线电和fpga实现，在特殊应用环境里对64qam突发模式解调器进行fpga硬件设计。
In this paper , chapter 1 introduce firstly the characteristic of signal transferring on power line , and design communication ' s process and mode using spread spectrum communication achieve automatic meter reading ' s data transferring system using power line as communication ' s media 本文第一章首先介绍了电力线上信号传输的特点，然后设计了利用扩频技术实现以电力线为传输载体的自动抄表数据传输系统的通信方式及通信过程。
At first , the architecture of gsm system and gsm protocol architecture are introduced in the paper , and then discussing characteristics of the on - board wireless communication system in detail , based on this , protocol architecture of the on - board wireless communication system is put forward 本文首先介绍了gsm网络的体系与协议结构，然后详细分析了车载无线数据传输系统的应用特点，在此基础上，提出了车载无线数据传输系统的协议结构。
