滤波多音调制系统中滤波器组的设计及优化技术研究

【作者】 张灿；

【导师】 高振明；

【作者基本信息】 山东大学 ， 通信与信息系统， 2006， 硕士

【摘要】 近几十年以来，随着半导体技术和计算机技术的不断发展，无线通信已经逐渐成为人类日常生活中不可缺少的组成部分，而大量的用户需求反过来又促进了无线通信的发展。 随着声音、图像和数据通信业务在互联网和无线通信中的快速增长，对下一代通信系统的定义成为新的研究热点。在这种现代宽带无线通信系统中对数据速率的要求越来越高，这意味着数据传输时需要占用相当大的信道带宽且信道的时延扩展将大于一个传输符号的周期，因此如何在有限的带宽内高速可靠地传输信息是极为重要的。 加性噪声以及由多径传播导致的符号间干扰(ISI)限制了高速率无线通信技术的发展。在较高的信号传输速率下，传输符号的符号周期小于信道的时延扩展，从而产生ISI。因此在利用传统的单载波调制方式进行高速率无线通信时需使用多抽头均衡器，从而使系统的复杂度大大增加。研究表明，如果多径信道的时延扩展(信道记忆长度)远小于一个传输符号的符号周期，则由多径传播造成的ISI可以忽略不计，所以，我们可以利用多载波传输技术在不降低信息传输速率的条件下使信道中的传输符号的符号周期远大于多径信道的时延扩展，从而可以有效地对抗由多径传播造成的ISI。 滤波多音频(FMT)技术就是一种新兴的多载波技术。该技术的主要特点是各子载波具有很高的频谱约束性，对系统频率偏差不敏感。FMT技术是一种滤波器组调制技术，因此滤波器组的性能直接影响整个系统的性能。本文主要对FMT系统中的滤波器组的设计及其优化问题进行了研究。 本文首先对移动无线信道的传输特性、无线通信中的研究现状进行了分析和介绍，简述了FMT技术的研究背景和意义。 论文的第二章介绍了FMT技术的基本原理、基本系统模型，对FMT技术的基本轮廓进行了详细介绍，着重研究了FMT系统的有效实现问题。 论文的第三章分析了FMT系统中的滤波器组设计技术和方法，并对使用不同更多还原

【Abstract】 Wireless communication has played a more and more important role in peoples’ daily life with the development of semiconductor and computer technologies in recent decades, which in turn promote the rapid expansion of the wireless communication.The definition of the next generation of mobile communication is the new emphasis of research with the rapid increase in sound, image and data communications over the internet and wireless. The demand on data rate in this broadband wireless communication system will become higher and higher, which means the delay time of the delayed waves will become greater than one symbol time and a larger bandwidth is needed. So it is important to transmit data over band limited channel in a high data rate reliably.High data rate in wireless communication is limited by additive noise and the Inter-symbol Interference (ISI) owing to multi-path propagation. When the data rate is high, there is ISI because the signal duration is shorter than the channel delay spread. In conventional single-carrier modulation, the system complexity will increase greatly due to the multi-taps equalizer used in high data rate wireless communication. The effects of the ISI are negligible so long as the delay spread of the multi-path channel is significantly shorter than the duration of one transmitted symbol. So multi-carrier transmission technology can be used to overcome this limitation.Filtered Multitone (FMT) Modulation is a new multicarrier technology. In FMT system, the spectrum of each subchannel has a high level of spectral containment So the Inter-channel Interference (ICI) of FMT is negligible compared to other noise. FMT is a filter bank modulation technology, so the performances of filter bank decide the performance of system. In this thesis, we research the design and optimization design of filter bank in FMT system.In the chapter 1, the background and purpose of research efforts on FMT’s application in wireless communication is introduced by making a review on characteristics of wireless mobile channel, latest research developments in wireless communications.In the chapter 2, the principle of FMT, as well as its efficient implementation, is更多还原