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目前微处理机在数字通信方面的应用已很广泛.笔者将Z-80CPU用于某机的控制、检测上,取得了较好的效果.现将检测信道误码(比特)率部分介绍如下.测试信道的误码率采用(2~(15)-1)位m序列码,其特征多项武为1+X~(11)+x~(15).当发送端发送出这一m序列码时,在接收端将本地m序列产生器产生的同一m序列码(以下简称本地码)与接收到的m序列信码(以下简称信码)进行序列同步,然后检测出差错比特数.测试误码率的原理与随动式误码测试仪相似.当本地码与信码未同步时(本文中均指序列同步),将收到的信码“注入”本地码产生器15比特,让其重新启动,直至两者同步为止.可以近似认为,一次同步的概率约为(1-Pe)~(15),其中Pe为信道的误码率.当两者同步后,将本地码与信码逐比特比较,检测出差错比特数.由上可见,要测试误码率必须要解决以下问题:
At present, the application of microprocessors in digital communications has been very wide.I use the Z-80CPU for the control and detection of a certain machine, and achieved good results. Now we introduce the detection error rate (bit) rate of the channel as follows. The bit error rate of the test channel uses the (2 ~ (15) -1) -bit m-sequence code, and its characteristic multiple is 1 + X ~ (11) + x ~ Code, at the receiving end of the local m sequence generator generated by the same m-sequence code (hereinafter referred to as the local code) and the received m-sequence code (hereinafter referred to as the code) sequence synchronization, and then detect the number of error bits. The principle of bit error rate is similar to that of follow-on error code tester. When the local code and the code are not synchronized (in this paper, both refer to the sequence synchronization), the received code “INPUT” local code generator 15 bits, Let it be restarted until the two are synchronized, so that the probability of one synchronization is approximately (1-Pe) ~ (15), where Pe is the bit error rate of the channel.When the two are synchronized, Code bit by bit comparison to detect the number of error bits. From the above, to test the bit error rate must be to solve the following problems: