在20世纪70年代初期夏威夷大学首次试验成功随机接入。这是为了使地理上分散的用户通过无线电来使用中心计算机。由于无线电信道是一个公用信道，一个站发送的信息可以同时被多个站收到，而每个站又是随机发送的，因此这种系统是一个随机接入系统。夏威夷大学早期研制的系统称为ALOHA，是Additive Link On-line HAwaii system的缩写，而ALOHA恰好又是夏威夷方言的“你好”。下面先介绍纯ALOHA。-70 in the 20th century, the University of Hawaii in the early success of the first random access test. This is to enable geographically dispersed users to make use of computer radio. Road as a result of wireless telecommunications is a public channel, a station can send the information received by a number of stations, each station is randomly sent, this system is a random access system. University of Hawaii known as the Early Development of the system ALOHA, is Additive Link On-line HAwaii system of abbreviations, and ALOHA Hawaiian dialect is just a " Hello."　First introduced the following pure ALOHA.