范文编号:TX388 范文字数:14327,页数:63 摘要 码分多址(CDMA)以其频率规划简单、频谱利用率高和独特的抗多径衰落、软容量、软切换、宏分集以及灵活的变速率传输等技术特点,目前已成为第三代移动通信系统的主流技术,而直接序列扩频(DSSS)系统是目前应用最广泛的一种扩频通信系统。范文以m序列对基带信号进行直序扩频的调制解调来实现CDMA扩频调制解调建模。范文的设计与实现,采用altera公司MAX7000S系列的Epm7064slc44-10芯片在QuartusⅡ5.0软件上进行编程并仿真,最后在Protel 99 SE软件中制作原理图以及PCB板,通过示波器观察实际直序扩频调制解调的波形与QuartusⅡ5.0软件上仿真波形进行比较并进行相关的分析。设计模块主要包括了电源,时钟产生模块,基带信号产生模块,调制模块,以及解调模块。在解调过程中,采用単积分滑动相关捕捉来实现接收信息和PN码(m序列)的同步问题。 ABSTRACT Code Division Multiple Access (CDMA) frequency planning with its simple, high-frequency spectrum utilization and a unique anti-fading, soft capacity, soft switching, Acer diversity and flexibility of variable-rate transmission, and other technical features, has become the third generation mobile communication System of mainstream technology. M sequence papers to the base-band signal DSSS modem to achieve CDMA spread spectrum modem modeling. Design and Implementation of papers, the company used altera MAX7000S series of Epm7064slc44-10 chip in Quartus Ⅱ 5.0 software programming and simulation, the last in Protel 99 SE software produced in the schematic and PCB board, through the observation of the actual oscilloscope DSSS Modem and the waveform Quartus Ⅱ 5.0 wave simulation software to compare and associated analysis. Design modules include a power supply, clock generation module, base-band signal generator module, modulation module, and demodulator modules. Demodulation in the course of a spring integral sliding catch to achieve receive relevant information and PN code (m sequence) synchronization. 摘要 I
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