基于软件无线电的多通道宽带数字信号处理系统的实现
发布时间：2019-02-23 23:11
【摘要】：软件无线电是无线通信系统的重要发展趋势之一,核心思想是采用一个通用的、标准的、模块化的硬件系统,通过加载不同的软件来实现无线通信系统的各种功能。软件无线电增强了无线通信系统的灵活性和通用性,系统升级和系统之间互联将非常便利。软件无线电系统主要由射频处理部分(含天线)、中频处理部分和控制软件组成。目前,中频处理部分仍是软件无线电研究的重点。中频处理部分通常只有几个通道,面对信息量的加大以及信号处理速度的需求,本文主要基于软件无线电理论,结合目前的硬件工艺水平和数字信号处理理论,以实用、可实现为出发点,设计了一种多通道宽带数字信号处理系统,采用CPCI总线构架,板载3张中频四通道宽带数字信号处理平台,最大可同时处理12个通道的信号,每个通道带宽20MHz,最大可覆盖240MHz。每张中频四通道宽带数字信号处理平台主由AD、FPGA、DSP和CPCI总线等构成。CPCI总线通信速度大于33Mbyte/s;采用高速DSP和FPGA完成数字信号处理,提升平台的可编程性;A/D器件的处理速度为90MHz。本系统可完成基于中频70MHz,带宽20MHz的信号处理及基带分析、解调。本文的主要工作:1、查阅并分析了软件无线电理论及目前可实现的软件无线电系统;2、学习并掌握了通用中频宽带数字信号处理平台的原理:信号采样理论、多速率信号处理、数字上下变频、软件无线电平台硬件结构、可编程逻辑器件、模数/数模转换以及FSK、FM和QPSK调制解调;3、设计并实现了中频多通道宽带数字信号处理系统,包括主要器件的介绍、中频多通道宽带数字信号处理系统的详细设计及处理流程。可以实现同一种信号的超宽频段(240MHz=20MHz*12通道)识别,或者三种不同信号的宽频段(80MHz=20MHz*4通道)识别,实用性和扩展性强。;4、在中频多通道宽带数字信号处理系统中实现多路解调,比如FSK、FM和QPSK解调等,最后进行了试验验证(信噪比SNR=12dB时,FSK、FM+QPSK解调无误码)。本文的研究工作主要基于实际应用,对其他软件无线电系统还有具有一定的参考价值。而且可以通过FPGA和DSP相关工作的进一步开展,可以在这套中频多通道宽带数字信号处理系统中实现对更多目标信号进行分析和解调,包括定频、跳频信号。
[Abstract]:Software radio is one of the important developing trends of wireless communication system. The core idea is to adopt a general, standard and modular hardware system, and to realize various functions of wireless communication system by loading different software. Software radio enhances the flexibility and versatility of wireless communication systems. System upgrades and interconnections between systems will be very convenient. The software radio system is mainly composed of RF processing part (including antenna), if processing part and control software. At present, if processing part is still the focus of software radio research. The if processing part usually has only a few channels. In the face of the increase of information and the demand of signal processing speed, this paper is mainly based on the software radio theory, combined with the current hardware technology level and digital signal processing theory, in order to be practical. In this paper, a multi-channel broadband digital signal processing system is designed, which is based on CPCI bus and has three if four-channel broadband digital signal processing platform, which can process 12 channels at the same time. Each channel has a bandwidth of 20 MHz, with a maximum coverage of 240 MHz. Each if four-channel wideband digital signal processing platform is composed of AD,FPGA,DSP and CPCI bus. The communication speed of CPCI bus is more than 33Mbyte / s. High speed DSP and FPGA are used to complete digital signal processing to improve the programmability of the platform. The processing speed of the A / D device is 90 MHz. The system can complete signal processing, baseband analysis and demodulation based on if 70 MHz and bandwidth 20MHz. The main work of this paper is as follows: 1. Consulting and analyzing the software radio theory and the software radio system that can be realized at present; 2. Learning and mastering the principle of general if wideband digital signal processing platform: signal sampling theory, multi-rate signal processing, digital up-down conversion, hardware structure of software radio platform, programmable logic device, A / D / A conversion and FSK,FM and QPSK modulation and demodulation; 3. The if multi-channel broadband digital signal processing system is designed and implemented, including the introduction of main devices, the detailed design and processing flow of if multi-channel broadband digital signal processing system. It can be used to recognize the same signal in the ultra-wide band (240MHz=20MHz*12 channel) or three different signals in the wide band (80MHz=20MHz*4 channel), which has strong practicability and expansibility. 4. In if multi-channel wideband digital signal processing system, multi-channel demodulation, such as FSK,FM and QPSK demodulation, is realized. Finally, the experiment is carried out (SNR SNR=12dB, FSK,FM QPSK demodulation error code). The research work in this paper is mainly based on practical application and has some reference value for other software radio systems. Furthermore, through the further development of FPGA and DSP related work, more target signals can be analyzed and demodulated in this if multi-channel broadband digital signal processing system, including fixed frequency and frequency hopping signals.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.72
本文编号：2429317
[Abstract]:Software radio is one of the important developing trends of wireless communication system. The core idea is to adopt a general, standard and modular hardware system, and to realize various functions of wireless communication system by loading different software. Software radio enhances the flexibility and versatility of wireless communication systems. System upgrades and interconnections between systems will be very convenient. The software radio system is mainly composed of RF processing part (including antenna), if processing part and control software. At present, if processing part is still the focus of software radio research. The if processing part usually has only a few channels. In the face of the increase of information and the demand of signal processing speed, this paper is mainly based on the software radio theory, combined with the current hardware technology level and digital signal processing theory, in order to be practical. In this paper, a multi-channel broadband digital signal processing system is designed, which is based on CPCI bus and has three if four-channel broadband digital signal processing platform, which can process 12 channels at the same time. Each channel has a bandwidth of 20 MHz, with a maximum coverage of 240 MHz. Each if four-channel wideband digital signal processing platform is composed of AD,FPGA,DSP and CPCI bus. The communication speed of CPCI bus is more than 33Mbyte / s. High speed DSP and FPGA are used to complete digital signal processing to improve the programmability of the platform. The processing speed of the A / D device is 90 MHz. The system can complete signal processing, baseband analysis and demodulation based on if 70 MHz and bandwidth 20MHz. The main work of this paper is as follows: 1. Consulting and analyzing the software radio theory and the software radio system that can be realized at present; 2. Learning and mastering the principle of general if wideband digital signal processing platform: signal sampling theory, multi-rate signal processing, digital up-down conversion, hardware structure of software radio platform, programmable logic device, A / D / A conversion and FSK,FM and QPSK modulation and demodulation; 3. The if multi-channel broadband digital signal processing system is designed and implemented, including the introduction of main devices, the detailed design and processing flow of if multi-channel broadband digital signal processing system. It can be used to recognize the same signal in the ultra-wide band (240MHz=20MHz*12 channel) or three different signals in the wide band (80MHz=20MHz*4 channel), which has strong practicability and expansibility. 4. In if multi-channel wideband digital signal processing system, multi-channel demodulation, such as FSK,FM and QPSK demodulation, is realized. Finally, the experiment is carried out (SNR SNR=12dB, FSK,FM QPSK demodulation error code). The research work in this paper is mainly based on practical application and has some reference value for other software radio systems. Furthermore, through the further development of FPGA and DSP related work, more target signals can be analyzed and demodulated in this if multi-channel broadband digital signal processing system, including fixed frequency and frequency hopping signals.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.72
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