节点文献
基于软件无线电原理的短波数字通信平台的关键技术的研究
The Research of Important Characters of High Frequency Digital Communication Platform Based on the Software Defined Radio Theory
【作者】 孔京;
【导师】 郭黎利;
【作者基本信息】 哈尔滨工程大学 , 通信与信息系统, 2003, 硕士
【摘要】 软件无线电是90年代初提出的具有广阔发展前景的通信理论。软件无线电通信平台可满足第三代移动通信对系统开发的要求,即具有系统功能软件化和硬件电路模块化的特点,以便于实现低成本的更新和系统兼容。 本文以软件无线电的理论为基础,研究了软件无线电中的部分关键技术:包括数字上/下变频的实际处理模型以及调制解调部分的实现。为了使开发出的软件可以适用于高速DSP器件开发,节省系统资源,课题首先从数字信号处理的理论进行分析,得出可以利用抽样率转换的数字滤波器的特点,即多相滤波实现数字上下变频计算负担的减小,之后进一步将多相滤波器与频谱搬移部分结合,通过公式的推导,得出可利用快速傅立叶变换的特点实现多路信号的信道化发射和接收的处理模型。这种模型的可扩展性和移植性均很强,只须加入部分功能模块即可实现多种调制,文中给出了实现AM、ASK、MSK和QAM调制的具体算法。而其他调制算法,也可根据文中所介绍的思路,通过复载波调制实现软件无线电平台中的高效信道化发射接收功能。
【Abstract】 Software Defined Radio (SDR), first proposed in 90’s in last century, is a kind of technology which has great future in communication application. It can satisfy the demand of the 3G mobile communication such as the software realization of the system functions and the modularization of the hardware, and make it easy to update the system with less cost.Digital Down/Up Converter(DDC/DUC), modulation and demodulation are discussed in the dissertation as some essencial parts of SDR platform. To utilize the advantages of DSP chips, the system should be computing sources economical. According to digital signal processing theory, the poly-phase FIR can help reduce the workloads of the DDC/DUC. Therefore, adding the complex carrier mixers, the channelization system (a method of using a single wideband facility to transmit many relatively narrow-bandwidth signals.by subdividing the frequency spectrum used in the wideband channel) can be formed utilizing the characters of FFT. As the parts of SDR, such system should also be extensible. Any modulation types, if can use complex carrier orthogonal modulation, such as AM, ASK, MSK, QAM, etc, can be used in the system.
【Key words】 Software Defined Radio; Poly-phase FIR; Channelization; MSK; Complex Carrier; Orthogonal modulation; QAM;
- 【网络出版投稿人】 哈尔滨工程大学 【网络出版年期】2003年 04期
- 【分类号】TN925
- 【被引频次】2
- 【下载频次】488