扩时通信与扩频通信的特性对比及其不同应用形式的展现

时域与频域之间存在对等关系,与扩频通信对等的通信传输方式自然就是扩时通信,但在文献与工程中较少有对扩时通信的详尽分析与应用示例。针对这一情况,在对扩时通信原理及扩时与解扩时流程完整阐述后,从扩时码序列、扩时信号产生、解扩时抗干扰以及扩时多用户通信等多个方面与扩频通信的对应特性进行了逐一对比,在此基础上指出噪声通信与变换域通信实际上是扩时通信的一种特殊应用形式,属于扩时通信的类别范围。最后,通过仿真验证了前述理论分析与应用对比的有效性与正确性,从而为在理论模型上更好地理解扩时通信以及在工程项目中更广泛地应用扩时通信提供了重要参考。

Real-time Data Communication in Photoelectric Image Detection System

High speed data communication between digital signal processor and the host is required to meet the demand of most real-time systems. PCI bus technology is a solution of this problem. The principle of data communication based on PCI has been explained. Meanwhile, the technology of data transfer between synchronous dynamic RAM(SDRAM) and an mapping space of on-chip memory(L2) by expansion direct memory access(EDMA) has also been realized.