National Undergraduate Electronic Design Contest winning entries selected :1994

摘要:基于通信技术的列车运行控制系统(CBTC)是铁路信号的发展方向，交频分复用 OFDM)是一种无线环境下的高速传输技术，它对高速列车控制信息传输中卞要受到的由于多 径传播引起的快衰落所产生的影响有很强的抵抗能力.本文首先介绍了OFDM技术的发展和 基本原理，然后在计算机上用M atlal〕对其性能进行了仿真，仿真中将OFDM与传统的单载波 调制方式―i1，交振幅调制( 1frQAM)对抗多径十扰的性能进行了比较，最后分析了一者的仿真结果. -Abstract: Based on the communication technology train operation control system (CBTC) is a railway signal direction for the development of cross-frequency division multiplexing OFDM) is a wireless environment of high-speed transmission technology, its high-speed train control information transmission Bian be subject to the Due to the spread of multi-path fast fading caused by the impact of a strong resistance to diseases. This paper first introduces the OFDM technology development and the basic principles, and then on the computer〕 M atlal use its performance simulation will OFDM with the traditional single-carrier modulation-i1, cross-amplitude modulation (1frQAM) against multi-path interference of the 10 properties were compared with a final analysis of

4X4硅胶键盘的原理电路和键盘扫面使用的程序-4X4 Si KeyBoard circuit and applicaion code

blackfin DSP boot detailed description

介绍PID控制算法，并有详细的实例，包括系统设计方案和实现方法-Introduction PID control algorithm, and detailed examples, including system design and implementation method

电阻炉温度控制系统 原理图 实验方案等 测试通过-Resistance furnace temperature control system schematic experimental test programs

w3c搞的wap标准资料推荐，非常好的参考资料-w3c engage in the recommended standard data wap

基于P2P的可靠直播视频服务模型的建立和分析-P2P reliable broadcast video services model and analysis

Zyxe 3G+wifi无线路由器内部PCB照片-Zyxel 3G wifi wireless router internal PCB snapshot

以ALLSTAR13 OEM 板其为核心的GPS 接收系统包括电源、系统设置、通信、时间标志信息输出等电路，可利用软件实现导航卫星信号的快速捕获以执行相应的动态导航定位。-to ALLSTAR13 OEM board at the core of its GPS receiver system, including the power supply, system settings, communication, time stamp information output circuit, can use software navigation satellite signals to capture the rapid implementation of the corresponding dynamic navigation and positioning.