扩频电台的网络控制和信道编译码技术研究
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摘要
本文旨在为远程控制提供解决方案，并为可靠通信建立实验系统。主要内容包括远程网络控制、信道编译码和扩频电台系统设计三个方面。1)网络控制是基于嵌入式设备RCM2200，通过对它编程，实现了串口与以太网口之间数据的透明传输，并对登录用户实施用户验证。通过IE或TELNET访问RCM2200，可以更改其IP配置，主动发起和断开网络连接；在VC++6.0环境下开发了基于windows平台的SOCKET程序，实现了计算机与RCM2200的互连，并能通过计算机远程控制RCM2200串口上的串行设备。2)深入研究了卷积码的编译码算法，通过仿真比较了不同编码约束度、信噪比及软硬判决情况下的误码率；编写了卷积编码和维特比译码的实现程序。3)基于MATLAB，对扩频通信技术有关概念进行了仿真分析，并简要讨论了点对点扩频电台的系统设计和接口技术。
This paper is to provide a solution for Remote Network Control(RNC) and establish an experimental system for reliable communication. It covers RNC, channel codes and the system design of a spread spectrum radio device. 1) RNC is based on RCM2200 moudule. By programming the RCM2200, user can change RCM2200's configuration with a great convenience by means of IE or telnet. Actively launching or closing the network connection is realized and authentication is employed to keep out the unauthorized users. A Windows-based VC++6.0 program is written, which enables computer to directly communicate with RCM2200 moudule and control the peripheral device attached to the RCM2200 serial port . 2) Convolutional Codes and Viterbi Algorithm is studied. The BERs(Bit-Error Rate ) resulting from MATLAB simulation (at different constraint length, Eb/No and decision type ) are presented to show the performance of convolutional codes. A program is developed to simulate convolutional encoder and Viterbi decoder. 3) Based on MATLAB, the primary concepts of the spread spectrum are simulated. The system design and interface technology of a spread spectrum radio device is simply discussed.
This paper is to provide a solution for Remote Network Control(RNC) and establish an experimental system for reliable communication. It covers RNC, channel codes and the system design of a spread spectrum radio device. 1) RNC is based on RCM2200 moudule. By programming the RCM2200, user can change RCM2200's configuration with a great convenience by means of IE or telnet. Actively launching or closing the network connection is realized and authentication is employed to keep out the unauthorized users. A Windows-based VC++6.0 program is written, which enables computer to directly communicate with RCM2200 moudule and control the peripheral device attached to the RCM2200 serial port . 2) Convolutional Codes and Viterbi Algorithm is studied. The BERs(Bit-Error Rate ) resulting from MATLAB simulation (at different constraint length, Eb/No and decision type ) are presented to show the performance of convolutional codes. A program is developed to simulate convolutional encoder and Viterbi decoder. 3) Based on MATLAB, the primary concepts of the spread spectrum are simulated. The system design and interface technology of a spread spectrum radio device is simply discussed.
引文
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[3] Douglas E.Comer.TCP／IP网络互联技术．第1版．北京：清华大学出版社，1998
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[6] 萧秋水，文娟．Windows网络编程之VC篇．第1版．北京：清华大学出版社，2001
[7] Vijay K.Gary．第三代移动通信系统原理与工程设计．第1版．北京：电子工业出版社，2001
[8] 王立宁，马光新．MATLAB与通信仿真．第1版．北京：人民邮电出版社，2000
[9] 张贤达．现代信号处理．第1版．北京：清华大学出版社，1995：30～33
[10] 王秉钧．扩频通信．第1版．天津：天津大学出版社，1993
[11] 张贤达，保铮．通信信号处理．第1版．北京：国防工业出版社．2000：198-200
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[13] Marvin K.Simon,Jim K.Omura.Spread Spectrum Communication Handbook．第1版．北京：人民邮电出版社．2002：903-927
[14] 李建新，刘乃安等．现代通信系统分析与仿真．第1版．西安：西安电子科技大学出版社．2000
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[16] 隋爱芬，袁东风等．衰落信道下卷积码的软判决译码．电子学报．2001(6)
[17] 刘波，万坚，于宏毅．DS-SS码捕获策略的选择．无线电通信技术．2001(2)
[18] 曾兴雯，袭昌幸等．数字相关器及解扩性能分析．西安电子科技大学学报．1997，24(2)
[19] 邵志嘉，李立岩．一种最佳卷积编译码器的DSP实现．数据通信．1998(3)
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[21] 王金龙，沈良等．无线通信系统的DSP实现．第1版．北京：人发邮电出版社，2002
[22] 郭梯云，杨家玮等．数字移动通信，第2版．北京：人民邮电出版社，2001
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[25] 袁东风，罗济军等．(2，1，3)(2，1，5)卷积码在典型快衰落移动信道中的纠错性能．通信学报．1997，18(10)
[26] 孙洪，D.Le Ruyet,H.VuThien．卷积码的有限响应输入序列及其码距特性．华中理工大学学报，1999，27(1)
[27] 刘华章．长约束度卷积码译码器神经网络结构．通信技术，2000(2)
[28] 袁东风，李作为等．Punctured(2，1，N)系列卷积码的编码及其Verbi译码的软件实现．山东大学学报．2000，37(1)
[29] 胡爱群，庞康等．K=9卷积码的Viterbi译码算法及其FPGA实现．应用科学学报．1998，16(2)
[30] 阮铭，徐友云．基于FPGA的高速Viterbi译码器设计与实现．电讯技术．2001(1)
[31] 黄振，杨士中．可编程数字扩频系统的控制寄存器初始化．无线电工程．2001，31(6)
[32] 赵冰．卷积编码及基于DSP的Viterbi译码器设计．信息与控制．2002，31(5)
[33] 原进红，匡镜明等．删除卷积码与MPSK调制．北京理工大学学报．1995，15(2)
[34] 黄国盛，梁平原等．通过Winsock实现TCP／IP网络通信．吉首大学学报(自然科学版)．2002，23(2)
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[36] 胡爱群．直接序列扩频关键技术研究及其实现．移动通信．1997(5)
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[41] Chawla K K. Parallel acqusition of PN sequences in DS/SS systems. IEEE Trans Communication,Vol 42,1994 (5)
[42] Chawla K K,Sarwate D V. Acquisition of PN sequences in chip synchronous DS/SS systems using a random sequence model and the SPRT. IEEE Trans Com, Vol 42,1994 (6)
[43] N. M. Stojanovic and V. K. Jovanovic, New robust threshold setting method for frequency-hopping acquisition, lectron. Lett., Vol 28,1992 (9):815-817
[44] You, Y.H., Kim, J.H., Lee, Threshold decision for PN code acquisition in direct-sequence spread-spectrum packet radio systems C.E. Electronics Letters, Vol 32,1996(4): 306-307
[45] S. G. Glisic, Automatic decision threshold level control (ADTCL) in direct sequence spread spectrum systems based on matched filtering, IEEE Trans. Com., vol 36, 1988:519-527
the Viterbi algorithm, in Globecom, 1990:1318-1322
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[47] J.G Proakis. Digital Communications. New York, McGraw Hill, 1983
[48] Z-World, RabbitCore RCM2200C (Programmable Module with Ethernet) Getting Started Manual
[49] Z-World, An Introduction to TCP/IP
[50] Z-World, Dynamic C User's Manual
[51] Z-World, Dynamic C TCP/IP User's Manual
[52] G. D. Forney, The Viterbi Algorithm, Proc. of the IEEE, Vol 61, 1973:268-278
[53] Chan, F., Haccoun, D., Adaptive Viterbi Decoding of Convolutional Codes over Memoryless Channels, IEEE Transactions on Communications, Vol 45,1997(11)
[54] Droma, M. O., Zeng, J., Memory Savings in Viterbi Decoders for (n, 1, m) Convolutional Codes, IEE 1997, Electronics Letters Online Vol 12,1997(3)
[55] Kwan and S. Kallel, A Rate-k/n Heruistic Soft-Output Viterbi Algorithm(SOVA) that is Postdetector-Compatible, IEEE Trans. on Com., Vol 46,1998(5): 621-626
[56] R.Cypher and C.B. Shung, Generalized traceback techniques for survivor memory management in
[57] Oh, D.I., Hwang, S.Y., Design of a Viterbi Decoder With Low Power Using Minimum-Transition Traceback Scheme, IEE 1996, Electornics Letters Online, Vol 14,1996(95)
[58] T. Socolofsky, C. Kale,RFC 1180:TCP/IP Tutorial, 1991.1
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