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Abstract
In this paper, the simulation of a random access communication system is discussed. The system will be put into practice at the University of Hawaii to make the full information processing capabilities of the central computing facility on the Manoa campus available to operating units of the University on the islands of Oahu, Hawaii and Kauai. The system is known as the ALOHA System (Additive Links On-Line Hawaii Area System).
The performance of the RADA is analysed by an IBM 360/65 digital computer simulation. The error-detection retransmission method plays an essential role in the system. RADA is a message addressing system rather than a channel addressing system. Therefore, there is the probability of error caused by the collision of message packets. The probability of no collision of packets with increasing numbers of active users terminal is obtained and plotted when these are different delays in the system, on retransmissions, using the parameters of interest in the ALOHA system. The probability of success of packets with numbers of repeats (retransmissions) is also plotted for different number of active users terminals. The results of simulation model are compared with the mathematical model. The studies indicate the usefulness of the RADA communication system for the ALOHA system. The advantages of this RADA system compared to time-division multiple access (TDMA), frequency division multiple access (FDMA) and polling system are indicated.