正交是线性代数的概念，是垂直这一直观概念的推广。作为一个形容词，只有在一个确定的内积空间中才有意义。若内积空间中两向量的内积为0，则称它们是正交的。如果能够定义向量间的夹角，则正交可以直观的理解为垂直。物理中：运动的独立性，也可以用正交来解释。
Orthogonal Time–Frequency Signalin Over Doubly Dispersive Channels，IEEE上的文章
Space鈥揟ime Block Codes from Orthogonal Designs.
Probability of symbol and bit error for M orthogonal signals
simulink model for optical cdma system which uses orthogonal code.
this is the code for orthogonal code divison multiple access
NEW ORTHOGONAL BINARY USER CODES FOR MULTIUSER SPREAD SPECTRUM COMMUNICATIONS
正交线性判别分析（Orthogonal Linear Discriminant Analysis），可以用于数据降维上面。
This paper considers semiblind channel estimation and data detection for orthogonal frequency-division multiplexing (O...
This program generates OFDM (Orthogonal Frequency Division Multiplexing) signal and its spectrum. Also the guard interva...
Analysis and Simulation of a Digital Mobile Channe Using Orthogonal Frequency Division Multiplexing