【作者】 汤玉宇；

【导师】 吴国安；

【作者基本信息】 华中科技大学 ， 微电子学与固体电子学， 2009， 硕士

【摘要】 短波通信在军用通信领域得到广泛应用。现在短波信道的主要测试方法为外场测试,其成本高,受地理环境和天气因素影响很大,不可重复试验。因此,有必要研究一种可在室内测试,可模拟各种环境因素,可重复试验的短波信道模拟器。本文首先对短波信道的特性进行了分析和研究,选取了Watterson模型作为信道仿真的数学模型,并以此为基础进行系统设计。在综合考虑系统的设计方案基础上,进行模块划分,并规划出各模块的软硬件框图。系统选取TI公司的TMS320C6416t DSP为处理器,并以此为核心进行设计,分为主控板,模拟多径通信的信号处理板,以及合路板三个功能模块。本文设计了基于TMS320C6416t DSP的应用平台。主要包括EMIF接口的设计以及其与FIFO之间的通信,EDMA传输设计,以及基于FLASH烧写的BOOTLOADER设计。通过逻辑分析仪,数字示波器等对数据传输进行测试,验证了所搭建的平台是成功的。论文着重对基于Watterson短波信道模型的主要算法进行了分析,包括具有高斯功率谱的抽头因子Gi (t)的产生,高分辨率小延时和IQ正交解调模块。其中,对Watterson模型的核心模块,即实时高速高斯因子Gi (t)的产生过程进行了详细的介绍和验证。本文在最后对短波信道模拟器现阶段工作进展进行了总结,并对今后工作的重点难点进行了展望。更多还原

【Abstract】 HF communication is used widely in the military communication field. Now, HF channel test is usually carried in external field. This method cost much, is affected by geography and weather greatly, and test unrepeatable. So, it’s necessary to research a HF Channel Simulator, which can test in internal field repeatable, and simulate within varied channel condition repeatable.This article researches the characteristic of HF channel firstly, then chooses Watterson Mode as the mathematic mode, and designs system base on this mode. It divides modules according to the function, designs the hardware and software blueprint of the module. TI’s TMS320C6416t DSP is chosen as the processor, which is the core of the system. The function modules are controlling module, the processing module which simulating the multi-path and the addition module.This article designs the application platform base on the TMS320C6416t DSP. It includes the design of EMIF interface and the communication with FIFO, the design of EDMA transmission, the design of BOOTLOADER base on the flash burning. Then we test the system with oscillograph and logic analyzer, to prove it successful.Then, the article discusses the main algorithms of HF Channel Simulator base on Watterson mode. It includes the generation of Gi (t) factor with gauss power spectrum, the delay of high precision, and the quadrature demodulator. Especially, the generation of Gi (t) is the core of the Watterson module. So, we introduce and discuss the design in detail.At last, the article summarizes the step of HF Channel Simulator as yet, and brings forward the crucial and difficult points for the future.更多还原