SPREAD SPECTRUM MODULATION TECHNIQUES -spread spectrum - those modulation methods that are producing a signal whose spectrum is more wider than of the data signal, the occupied frequency band being independent by the signal of data band. -The sig

QPSK调制器的FPGA实现，提出了一种基于FPGA实现QPSK的方法-QPSK Modulator FPGA, presents a FPGA-based QPSK method of achieving

全数字QPSK接收机同步技术研究。是一个PDF得资料-All-digital QPSK receiver synchronization technology research. To information is a PDF

STV6110A 8PSK/QPSK low-power 3.3 V satellite tuner IC