A documentary film is a nonfictional motion picture intended to document some aspect of reality, primarily for the purposes of instruction or maintaining a historical record.[1] Such films were originally shot on film stock—the only medium available—

Des算法简介,算法历史由来，算法详解等-About Des algorithm, algorithm historical origin algori etc. ......

This paper depicts the development of Orthogonal Frequency Division Multiplexing a historical perspective. A summary of major research milestones are noted that contributed to modern-day OFDM. These contributions include the use of discrete F