无线通信系统的研究与设计 二

^论文字数:18423,页数:43  附任务书，开题报告，文献综述

 无线数据通信系统的研究与设计
摘要：随着信息产业的迅速发展，无线通信在人们的工作和生活中起到越来越重要的作用，它占整个数据通信领域的份额比重也正日益加重。高速、宽带、延迟小的无线传输系统日益受到人们的青睐，而且人们对数据传输方式的灵活性要求也越来越高。传统的数据传输方式为有线传输方式。有线传输方式不但应用设备被限制在固定的范围内，架设线路的成本有时也过高得使人们难以接受。而且在一些特殊的场合，如运输工具中、移动办公中、博物馆等不适合布线的场合，无线数据传输变成了最好的选择。
 ^论文中，我们在传统FSK数字调制理论的基础上，系统地分析了FSK数字调制/解调理论与高频信号放大技术,设计并实现了50公里1200bps无线数据传输的发射模块与接收模块，完成了远距离的无线数据传输业务。
 首先，我们提出了设计的总体方框图，并在此基础上实现对各个部分的设计。发射模块中，我们采用了FSK 数字调制技术，应用73M223 FSK数字调制解调芯片，把数字信号变换成适合传输的模拟信号然后经混频、高放后发射到空中。接收模块中，我们将本振电路与调制电路合并在一起，有效地缩减了电路的体积。我们应用MC13135设计并实现了具体的电路，恢复出较好的接收数据波形。然后，对收发系统的误码率进行了测定。测量结果达到了我们的要求。最后，我们对收发系统的误码率、发射功率、传输距离进行了测定，测量结果达到了我们的要求。              
 本文设计的无线数据传输模块结构紧凑力求在提高传输效率的同时，降低成本，具有很好的应用前景。
 
关键词：无线数据通信    FSK调制解调    数字信号
 
Research and Design Of Wireless Data Transmission
 
ABSTRACT: With the development of the information industry, the wireless communication plays a more and more important role in people’s daily life and its proportion in the whole data transmission field is larger and larger. Wireless transmission system with high speed, wide band, small retardance receives people's favor day by day and the requirements of its agility are becoming more and more. The traditional data transmission way is wired transmission mode. The wired transmission mode is not only limited in using the equipment but also in the fixed scope, and sometimes the cost is too high for people to accept. Moreover in some special situations, like in the transport means, in the motion work, the museum and so on, does not suitable for the wiring the situation, then the wireless data transmission turned to be the best choice.
 First of all, we have put forward the overall block-diagram designed and realized the design of each part on this basis. We used FSK figure modulate system in the Launching module and adopt 73M223 FSK figure to modulate the demodulation chip, varied the digital signal into the suitable analog signal and then transmitted them to the sky after mixing. In the receive module, we mixed the electric circuit and the demodulation electric circuit together effectively and reduced the electric circuit volume. We applied MC13135 to design and realized concrete electric circuit, resorted better receiving data wave. Then we tested the error rate of the receiving and launching system and the measurement result met our requirements. Finally, we tested the error rate of the launching system, the emissive power, the transmitting range, and also the results were satisfied.
 This article designs the wireless data transmission modular and its structure is compact. It makes every effort to make the transmission efficiency and cost lower at the same time. So it has a very good application prospect.
 
Keywords：Wireless data transmission；Module and adopt of FSK；Datasignal
 目  录
 前言………………………………………………………………………………………… 1
摘要………………………………………………………………………………………… 3
Abstract…………………………………………………………………………………… 4
第1章 无线发射模块的工作原理与设计………………………………………………… 5
 1.1 调制电路的设计………………………………………………………………… 5
 1.1.1 数字调制技术…………………………………………………………… 5
 1.1.2 FSK数字调制电路的设计…………………………………………………8
        1.1.3 2FSK信号的功率谱密度…………………………………………………10
        1.1.4 73M223调制解调器实现FSK数字调制…………………………………11
        1.1.5 73M223应用电路设计…………………………………………………… 12
 1.2 150MHz晶体振荡器的设计……………………………………………………… 13
 1.2.1石英晶体的基本特征………………………………………………………14
 1.2.2 石英晶体振荡电路……………………………………………………… 16
 1.3 混频电路的设计………………………………………………………………… 17
 1.3.1混频器的工作原理…………………………………………………………17
 1.3.2晶体管混频电路………………………………………………………… 18
 1.4阻抗匹配电路的设计…………………………………………………………… 19
第2章射频功率放大器的工作原理与设计……………………………………………… 20
 2.1丙类谐振功率放大器的功率与效率…………………………………………… 21
 2.2高频功率放大电路……………………………………………………………… 24
 2.4发射机电路图…………………………………………………………………… 25
第3章天线的原理与设计…………………………………………………………………26
 3.1半波偶极天线…………………………………………………………………… 27
   3.2折叠偶极天线…………………………………………………………………… 28
第4章无线接收模块的工作原理与设计…………………………………………………29
    4.1高放、混频、中放电路的设计………………………………………………… 29
    4.2 FSK信号的解调………………………………………………………………… 29
 4.3接收机应用电路的设计…………………………………………………………30
 4.4 接收机整机电路…………………………………………………………………34
第5章电源电路模块的原理与设计……………………………………………………… 35
参考文献……………………………………………………………………………………37
致谢…………………………………………………………………………………………38
小结…………………………………………………………………………………………39
附录（图）…………………………………………………………………………………40

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