GSM手机综测仪接收模块的DSP实现

【作者】 陈宇；

【导师】 彭启琮；

【作者基本信息】 电子科技大学 ， 信号与信息处理， 2003， 硕士

【摘要】 近年来，移动电话在中国迅速地普及和发展，市场上的国产手机已经占据了一定的份额。但是用于测试手机性能的仪器却以国外的产品为主，中国自己的测试仪器的研究开发刚刚起步。本课题涉及的项目就是开发用于维修的GSM手机综合测试仪。该手机综测仪中的基带处理部分是本论文关注的内容。基带处理部分采用了DSPs+FPGA的结构，具有结构灵活的特性，通用性较强，适于模块化设计。并且开发周期短，系统易于维护和升级，适合用于实时信号处理。综测仪由信令模块，发射模块，接收模块和测量模块组成。本论文的主要任务是用DSP，通过几个模块之间的联调，实现基带处理的接收模块的功能。接收模块主要完成GMSK解调和解码功能，并将所解码出的手机上行的信号传递给信令模块。解调采用的是2BIT差分解调，解调后根据不同信道的类型采用不同的解码方式，再将解码的结果放入与信令模块共享的双口RAM，以便信令模块取走。本课题实现了正确解码手机上行信号，为以后阶段的测试模块调试打下了基础。更多还原

【Abstract】 Integrative Testing Instrument for GSM handsets is used to measure some important parameters of GSM handsets, such as signal quality and function performance. Its base-band module is mainly made up of four DSPs: signaling, submitting, receiving and testing. This dissertation mainly discusses the implementation of the software for the receiving DSP. In the process of implementation, it is essential to find a scheme to solve the following problems: (Identification of the logic channel type of signals from handsets, which is the key to determine which decoding module should be called. (Decoding the signal from handsets correctly, which depends on whether the comprehension about the channel decoding protocols concerned is right and whether a pattern for data-storing can be developed. (The rather high requirement for real time processing. Whether failed to contain the process in the strictly limited time , the whole system could not work . As an achievement, a mature channel-judge scheme has been developed, which answers for the requirements of real-time processing. And debugging practice has testified that in this scheme the receiving DSP can accurately decode all the signals from handsets. In the fifth chapter this scheme is discussed in details. Other contents: In the first chapter, the preface is presented; In the second chapter, a general introduction for the GSM Integrative Testing Instrument is given; In the third chapter, on-chip peripherals used in substrate DSP software are introduced; In the forth chapter, protocols of GSM wireless interface signaling are introduced;<WP=6> In the sixth chapter, a conclusion has been drawn.更多还原