基于DSP的OFDM基带传输系统设计与实现

发布时间：2018-01-06 12:28

本文关键词：基于DSP的OFDM基带传输系统设计与实现　出处：《西南交通大学》2016年硕士论文　论文类型：学位论文

【摘要】：正交频分复用(OFDM)技术以其高效的频谱利用率和较强的抗干扰能力在第四代移动通信中被作为一项关键技术使用。数字信号处理器(DSP)由于其特殊的设计结构、专门的硬件处理单元和快捷的处理速度而被广泛应用在通信领域。本文的目的是在硬件平台上实现OFDM基带传输系统。参照802.11a标准,在深入研究了OFDM理论基础之后,首先在MATLAB平台上仿真OFDM基带传输系统相关算法来验证系统的可行性,然后设计并制作基于TMS320VC5509A的硬件平台并对硬件进行测试,最后在硬件平台上实现了OFDM基带传输系统。本文的重点是硬件电路的设计和软件算法的实现。硬件设计上以DSP作为核心器件,外接一些辅助模块,其中串口通信模块和SDRAM模块是重点设计模块。软件方面主要使用C语言在CCS中实现相关算法,主要包括发送端数据源的产生、16QAM调制、IFFT、添加循环前缀、加窗、信道模拟和接收端去CP、FFT、16QAM解调以及Viterbi译码等过程,每个算法都给出了实现方法和运行结果,其中重点研究了Viterbi译码算法。还编写了为程序和数据分配存储空间的链接器配置文件(CMD文件)。最后给出了系统在不同信噪比条件下的测试结果,并对结果进行了分析,说明了在基于TMS320VC5509A的硬件平台能够实现OFDM基带传输系统；还分析了系统对DSP时钟周期的使用情况,发现Viterbi译码是制约系统性能的瓶颈。在最后对设计中的不足和改进之处进行了总结。
[Abstract]:Orthogonal Frequency Division Multiplexing (OFDM) is used as a key technology in 4th generation mobile communication with its high spectral efficiency and strong anti-jamming capability. Digital signal processor (DSP). Because of its special design structure. The special hardware processing unit and fast processing speed are widely used in the field of communication. The purpose of this paper is to implement OFDM baseband transmission system on the hardware platform, referring to 802.11a standard. After deeply studying the theoretical basis of OFDM, the feasibility of the system is verified by simulating the relevant algorithms of the OFDM baseband transmission system on the MATLAB platform. Then the hardware platform based on TMS320VC5509A is designed and manufactured and the hardware is tested. Finally, the OFDM baseband transmission system is implemented on the hardware platform. The emphasis of this paper is the design of the hardware circuit and the realization of the software algorithm. In the hardware design, DSP is the core device and some auxiliary modules are attached. The serial communication module and SDRAM module are the key design modules. C language is mainly used to implement the related algorithms in the CCS in the software, including the generation of data source in the sending end of the generation of QAM modulation. IFFT, add cyclic prefix, add windows, channel simulation and receiver to CPFFTFFT16QAM demodulation and Viterbi decoding process. Each algorithm has given the implementation method and the running result. The algorithm of Viterbi decoding is mainly studied. The linker configuration file which allocates storage space for program and data is also written. Finally, the test results of the system under different signal-to-noise ratio (SNR) are given. The analysis of the results shows that the OFDM baseband transmission system can be realized on the hardware platform based on TMS320VC5509A. The application of DSP clock cycle in the system is also analyzed. It is found that Viterbi decoding is the bottleneck to the performance of the system. Finally, the shortcomings and improvements in the design are summarized.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.53

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