非接触式IC卡是在卡中敷设天线，利用天线的接收发射，与读写器的天线交换信号，实现一种无线通讯，非接触式IC卡又被称为射频卡（RFC——Radio Frequency Card），简称RF卡，非接触式IC卡系统被称为射频识别系统（RFID——Radio Frequency Identification）。
the doubly-fed pumped storage generating systems which have been newly developed with recent progress of power electronic technology as is setting can contribute not only to power system frequency control at nights, but also to improvement of power
In this paper, a gigahertz monolithic frequency synthesizer was realized in a standard 0.25-μm CMOS technology. It consumes 55 mW from a single 2.5- V power supply, and is fully functional over the complete frequency range of the interest. The outpu
A rapid synchronization method is presented for an orthogonal frequency-division multiplexing (OFDM) system using either a continuous transmission or a burst operation over a frequency-selective channel. The presence of a signal can be detected upon
