【作者】 朱旭明；

【导师】 黄元；

【作者基本信息】 暨南大学 ， 通信与信息系统， 2001， 硕士

【摘要】 随着人们生活水平的提高，人们对获取信息方法的要求也越来越高，第三代移动通信系统就是在这种背景下提出来的。而第三代移动通信系统要求提供高速率、高质量的多媒体综合业务的服务，就必然要解决在有限的频带资源里进行高速数据的传输问题，也就是说，如何提高频带利用率的问题。 MQAM调制技术是一种频带利用率较高的调制技术，在移动通信系统中使用，在一定程度上将会减缓移动通信频带资源紧张的情况。但是，MQAM调制抗干扰性能较差等缺点，又限制了它的应用。因此，研究一种可行的MQAM调制方案，以应用于无线移动通信系统是很有必要，也是很有意义的。 本课题的工作是设计变速率MQAM传输仿真系统，研究变速率MQAM调制方案在无线移动瑞利衰落信道中的应用。本文从电磁波在无线移动信道中的传播特点入手，分析了无线移动衰落信道对数字信号传输的影响，建立了瑞利衰落信道仿真器。本文还详细分析与比较了矩形MQAM、圆形MQAM、MPSK等多种调制技术的误码特性，确定了圆型MQAM调制为无线移动衰落信道传输的最优方案。在此基础上，重点完成了自适应变速率MQAM传输仿真系统的方案设计，在软件实现上，采用了模块化与多线程协同工作的方式，以实现准实时的仿真。最后给出以上研究内容的仿真结果，具有显示直观、形象与动态的效果。更多还原

【Abstract】 The improvement in people’s living standard, people require better methods to acquire information, the third generation of mobile communication system was raised accordingly. Because the third generation of mobile communication will provide integrated multimedia service at high rate with high quality, it certainly solves the problem of how to transmit the high rate data in the limited frequency resource, that is how to improve the utilization ratio of the frequency resource. MQAM is a modulation technology that has a higher utilization ratio of frequency band. If it is applied in the mobile communication system, the problem of tension of the frequency resource can be solved. However, the anti-interference is not good for the MQAIVI, its application will be limited, so it is important and significant to study a feasible scheme of MQAM. This subject is to design a simulation scheme of vary-rate MQAM transmission system, and to research its application in the wireless mobile rayleigh channel. In this paper, the author begins his research into some characteristics of electromagnetic wave, and then analyzes the effect of the digital signal transmission on the wireless mobile fading channel, and created a simulator for rayleigh fading channel. Besides, the error-code characteristics of several modulation technology, such as the rectangle QAM, the circle QAM and the MPSK, are analyzed and compared in details, and the circle QAM is selected as an optimal scheme on the wireless mobile fading channel. Meanwhile, the author finished a scheme design for the adapted vary-rate MQAM transmission simulation system. In order to implement the quasi-real time simulation, the modularization and the multi-thread construction are used in the software design. At the end, the simulation results could be indicated directly, vividly and dynamically.更多还原