ofdm下的QAM调制解调系统实现，包括定时同步-QAM OFDM modulation and demodulation under the system implementation, including timing synchronization

【硬盘录像机同步自动定时校时软件】支持海康威硬盘录像机，实时所有硬盘录像机时间一致性、每小时自动与服务器时间同步一次。-DVR automatic synchronization timing school software] support Haikangwei DVR, real time DVR time consistency hour time automatically synchronized with the server time.

一种新的符号定时和载波频率同步算法,该算法将OFDM符号分成几部分。它使用相关性和积累在几个OFDM同步算法对OFDM系统基于试点,使用前言快速、准确获取信号,在有限的时间建立同步,利用导频跟踪同步信息-A new symbol timing and carrier frequency synchronization algorithm is presented and the algorithm divides the OFDM symbol into several parts. It us

Synchronization is one of the most critical issues in ultra-wideband communications due to the short duration of the pulses. In this work, a semi-blind synchronization scheme based on maximum-likelihood techniques to recover both symbol and f

这是一个定时同步程序，CP起到克服码间干扰的左右，对多径延时有很好的调节作用。 -This is a timing synchronization procedure, CP play about overcoming inter-symbol interference, multipath delay has good regulation.