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OFDM(正交频分多址)和CDMA(码分多址)同样是在高度机密的军方实验室中研发成功,同样曾在冷战时期作为有力的通讯方法;同样经历了一个缓慢的向民用转型的过渡期,同样是基于最大限度的提高数字信号在传输过程中的识别率,最大限度降低其他信号传输干扰的构想进行设计,
OFDM (Orthogonal Frequency Division Multiple Access) and CDMA (Code Division Multiple Access) have also been developed successfully in highly confidential military laboratories and were also used as powerful means of communication during the Cold War; they also experienced a slow transition to civilian use The transitional period of transition is also based on the idea of maximizing the recognition rate of digital signals in the transmission process and minimizing the interference of other signal transmissions.