新型多模式高速无线多媒体数传技术的研究  

Study on a New Multi-mode High-speed Wireless Multimedia Data Transmission Technology

作　　者：李振玉[1] 金晓军[1] 时庆国[2] 姜中 

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]北京交通大学计算机与信息技术学院,北京100044 [3]北京立兴华电讯科技发展有限公司,北京100083

出　　处：《中国铁道科学》2004年第5期102-109,共8页China Railway Science

基　　金：铁道部科技研究开发计划项目(98J29)

摘　　要：为解决铁路高速无线数传的安全与可靠性,研制和试用对数据、话音、图像多业务信息适配、汇接与同传的软硬平台。采用非线性码MM高密度密钥,实现"加密与纠错兼容一体化",达到破译复杂度为O(2104),纠错能力为检4纠3,正确解密概率达0 999999988,数据信息传输速率高达3Mbps～22Mbps时传输误码率优于10-10,重传率为0。为实现多模式无线数传,研制出多速率、多路、多媒体复用器,具有低速异步及高、低速同步与多速率数传功能,同步时间小于1s,开机同步可靠率达99%,设有动态图像、数据、话音、文本等四路通道,具有自适应多模式信息组合数据通道,使数字系统可实现同一平台多作业信息复用传输。数传网络接口可支持OS/2与Windows两种操作系统相互平滑转换,开发出多点互联控制软件,实现局部网随机接入。设计出"线状"、"链状"、"面状"、"点 面混合"及"树状"五种信息网型,满足铁路运输信息化及应用多媒体数据2km～120km的传输需求。This paper aims to improve the security and reliability of high-speed wireless data transmission in modern railroad industry. A hardware and software platform is presented for paring, merging, and transmitting of text, voice, and video sources. Non-linear MM code, high level security inscription is used for data transmission to achieve ″encryption and error correction in one″. The system cipher code complexity of uncover is (O(2^(104))), error correcting ability is 3 out of 4, correct description probability is 0.999 999 988, rate of data transmission is as high as 3 to 22 Mpbs, rate of mis-transmission is lower than 10^(-10), and duplication rate is 0. In realizing multi-mode, multimedia wireless transmission, the system provides multi-speed, multi-channel, multi-media process. It possesses functions of low bit rate asynchronous, high/low rate synchronization, and multi-rate data transmission. It has the properties of pacing time less than 1 second, reliable rate of pacing of 99%, and four different channels for dynamic graphics, data, audio, and text transmission. It also has the ability of self-adjustment to accommodate multi-mode data combination. Its data output can be used by different users on same platform. Data transmission network is compatible with OS/2 and Windows operating systems. The multi-point control software enables random access from any point on the area network. The system indicates five data transmission protocols-linear, chain, area, point-area combination, and tree style. It fulfills the needs for multi-media data transmission for distance of between 2 and 120 km and advanced data transmission in rail transportation.

关 键 词：通信 无线数传 多模式 多媒体 数字加密与纠错 信息采集与处理 软件平台 

分 类 号：U285.44[交通运输工程—交通信息工程及控制] TN919.8[交通运输工程—道路与铁道工程]