基于DSP的调制解调及过程设计.doc

摘要软件无线电的核心思想是对天线感应的射频模拟信号尽可能地直接数字化,将其变为适合于数字信号处理器( DSP )或计算机处理的数据流,然后由软件来完成各种各样的功能,使其具有更好的可扩展性和应用环境适应性。本论文首先简要介绍了课题的研究意义及软件无线电的研究现状和发展趋势,并对课题研究的可行性进行了分析。S 开发环境及软件无线电实验平台作了简要介绍。紧接着进一步的探讨了关于实现基于 DSP 的调制解调过程中的一些关键技术,包括了天线技术、射频转换技术、A/D/ A 技术、高速数字信号处理技术、同步技术。然后又着重分析并分别介绍了一种基于 TMSC6713 芯片的 BPSK 、QPSK 的调制解调过程的方案设计。该方案在发送端采用相位选择的调制方法来产生 BPSK/QPSK 调制信号,在接收端采用相干解调的方法来对接收到的 BPSK/QPSK 调制信号进行相干解调; 由于 BPSK/QPSK 调制解调过程中存在一些问题,所以又介绍了 BPSK/QPSK 的调制解调的改进算法。最后又针对方案设计存在的不足进行了阐述,并对未来还作了相关的展望。关键词: 调制;解调;软件无线电; DSP A BSTRACT The idea of software radio is the radio frequency on the antenna inductive analog signal to digital, turn it into a suitable for digital signal processor (DSP) puter processing of data streams, and then by the software plete a variety of functions, so it has better expansibility and adaptability of environmental. This paper first briefly introduces the research status and development trend of the research significance and the research of software radio, and the feasibility of the research are analyzed. Secondly, S development environment and the software radio experimental platform is briefly introduced. Then a further discussion about some key technologies to realize the modulation and demodulation process based on DSP, including the antenna, RF conversion technology, A/D/A technology, high speed digital signal processing technology, synchronization technology. Then analyzes and introduces the design ofa modulation and demodulation process of TMSC6713 chip BPSK, QPSK based scheme. The scheme adopts the modulation method of phase selection in the transmitter to generate the BPSK/QPSK signal at the receiving end, coherent demodulation method used for coherent demodulation of BPSK/QPSK signals received; there are some problems of BPSK/QPSK modulation and demodulation process, and introduces the improved algorithm of BPSK/QPSK modulation and demodulation of the. Finally according to the deficiency of design are described, and the future has also made the relevant expecta