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为测试数字通信系统的误码率,通常采用图1所示的测试方法。在发端,用线性反馈移位寄存器产生伪随机M序列码,此信号加于通信系统的发端,经传输信道,收端解调后的信码送入误码分析仪进行误码率测试。误码分析仪若采用随动同步方式进行误码检测,则能缩短同步捕捉时间,提高测试精度;并能区分突发性脉冲干扰和失同步。我们根据随动同步检测M序列误码率的基本原理,试制出随动同步误码分析仪,其工作速率可达10兆毕/秒;在数码率为8448千毕/秒、帧周期为2~(15)-1=32767的情况下,同步捕捉时间仅2.04微秒,基本能满足我国目前各种数字通信信道的要求。经线路测试,使用,仪器工作稳定可靠,证明此方案切实可行。
To test the bit error rate of a digital communication system, the test method shown in Figure 1 is usually used. At the sending end, a linear feedback shift register is used to generate a pseudo-random M-sequence code which is applied to the originator of the communication system. The received signal after demodulation is sent to the BER analyzer for bit error rate testing via the transmission channel. If the BER analyzer adopts synchronous error detection, it can shorten the synchronization capture time and improve the test accuracy; and it can distinguish sudden burst interference and loss synchronization. Based on the basic principles of synchronous synchronous detection of M bit error rate, we developed a synchronous synchronous bit error rate analyzer with a working rate of up to 10 MBytes / sec. With a digital rate of 8448 kbytes / s and a frame period of 2 ~ (15) -1 = 32767, the synchronization capture time is only 2.04 microseconds, which can basically meet the current requirements of various digital communication channels in our country. The line test, use, instrument work is stable and reliable, that this program is feasible.