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本文介绍两种类型的指令反馈信道系统。 a)复杂反馈系统——它对每条指令的识别是经反馈信道发送回来的。 b)判别反馈系统——它的反馈信道仅用来指示卫星是否已辨认出所发送的指令字。对于复杂反馈系统,卫星是否正确地收到所发指令字的判别是在地面上进行的;而判别反馈系统是在卫星上进行判别的,其反馈信道的作用只是当卫星没有辨认出所发指令字时使地面站重发。判别反馈系统属于单向信道,因为卫星只是在指令发送后判别其是否已发出。如果所发指令字已被译成指令作用,则无论正确与否,地面站已不能再行控制。文中严格证明了下述定理:“总有可能确定一种判别反馈系统,使其错误概率与复杂反馈系统相同。”
This article describes two types of instruction feedback channel system. a) Complex Feedback System - It identifies each instruction sent back through the feedback channel. b) Discrimination Feedback System - Its feedback channel is used only to indicate if the satellite has identified the transmitted instruction word. For the complex feedback system, the satellite is correctly received by the command word word is judged on the ground; and discrimination feedback system is to determine the satellite, the feedback channel only when the satellite did not identify the command word When the ground station retransmission. Discriminant feedback system is a one-way channel, because the satellite is sent after the command to determine whether it has been sent. If the command word has been translated into an instruction, the ground station can no longer be controlled, whether it is correct or not. The following theorem is rigorously proved: “It is always possible to determine a discriminant feedback system that gives the same error probability as a complex feedback system.”