【作者】 李学军；

【导师】 陈建安；

【作者基本信息】 西安电子科技大学 ， 信号与信息处理， 2005， 硕士

【摘要】 软件无线电(SWR)是近几年随着微电子技术的进步而迅速发展起来的新技术。它首先诞生于军事通信领域,后来被引入到个人移到通信中,并逐步渗透到其他电子技术领域。软件无线电作为一种新的通信系统,它是由“A/D-DSP-D/A”硬件平台和各种功能模块组成,不同的通信功能采用更新软件的方式加以实现。由于它克服了传统无线电以功能单一、可扩展性差的硬件为核心的设计局限性,加上它具有巨大的潜在价值,所以一经提出就受到了全世界的广泛关注。论文介绍了国内外软件无线电的研究现状,并且讨论了采样、多速率信号处理、数字调制解调等相关理论,在此基础上设计了一种基于FPGA+DSP 的软件无线电接收机的实验平台,重点研究了数字下变频和数字相干正交解调两个主要内容。接收机采用宽中频数字化结构,即选择在中频进行采样量化,将数字下变频、数字解调等数字信号处理部分由软件定义,并下载到FPGA 中进行实现。采用这种结构大大降低了采样速率和数字信号处理的速度,对硬件性能要求低,比较容易实现。最后用SystemView 软件对接收机进行系统级仿真,用硬件描述语言描述接收机中不同的功能单元,并分别进行了仿真、综合、布局布线及下载调试。论文验证了软件无线电对多频段多模式信号进行处理的灵活性,开放性和兼容性的特点,同时也表明FPGA 可重构性和并行处理的优势,特别适合于软件无线电模块化标准化的设计要求。更多还原

【Abstract】 The software radio (SWR) is a new developing technology with the progress of micro-electronics technique in recent years. It was first presented in the field of military communication, and later introduced to personal communications and permeated through the technological field of other electronics. As a new communication system, the software radio is made up of "A/D-DSP-D/A" hardware platform and various kinds of function module, and the different communication functions can be realized by the way of updating the software. Because it has overcome the limitation of the traditional design on radio, which regarded the hardware with single function and narrow expansibility as its core, and it has enormous potential market value, the software radio has been concerned extensively in the whole world after it was proposed for the first time. In the paper, the current status of the domestic and international research on software radio is introduced, and the principle of sampling, multi-rate signal processing, digital modulation and demodulation is discussed. A software radio experimental platform on FPGA+DSP is set up in the paper, which focuses on the digital down converter (DDC) and the digital orthogonal demodulation. The receiver adopts the digital structure of wide-IF to sample and quantize the IF signal. And the signal processing units such as DDC, digital demodulation and so on, are defined by the software, which can be downloaded into FPGA for their realization. The structure reduces the rate of sampling and the speed of digital processing, and requires low-performance hardware, which can be realized easily. Finally, the simulation of system grades about the receiver is carried on with SystemView, and different function units are described with HDL to emulate, synthesize, layout, route, download and debug. The paper shows that the software radio system has the flexibility, openness and compatibility in processing the multi-band and multimode signal, and indicates that FPGA is especially suitable for the standardized designing of SWR with its advantage of reconfiguration and parallel processing.更多还原