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目前在数字传输系统中的误码告警,已广泛采用伪误码监视。伪误码信号的产生方法各有所异,而伪误码统计单元是一样的。这个单元的设计主要是合理地选取总码数n,和误码个数N(相当于计数器的长度)。本文通过分析和计算指出,作为伪误码统计中的n,实际可采用的是有限的,并且每一个n与一个确定范围的伪误码率P_P相对应,所以n必须根据具体的P_P来选取,不能任取。从性能、电路结构和经济诸方面综合考虑,存在着最佳设计参数。进而又指出,当nP_P=10时,可以获得最佳计数器的长度,其值为7。这个关系为伪误码统计单元的设计提供了一个科学的、简便的方法。为了便于实际应用,还给出了n为不同值时的最佳设计用表。
The current bit error warning in digital transmission systems has been widely adopted with pseudo error codes. Pseudo-error signal generation methods vary, while the pseudo-error statistics unit is the same. The design of this unit is to select the total number of codes n and the number of error codes N (equivalent to the length of counter). In this paper, it is pointed out through analysis and calculation that as n in the pseudo-error statistics, the actually available ones are finite, and each n corresponds to a certain range of pseudo-error rate P_P, so n must be selected according to the specific P_P , Can not afford to take. From the performance, circuit structure and economic aspects of comprehensive consideration, there is the best design parameters. Furthermore, it is pointed out that when nP_P = 10, the optimum counter length can be obtained, which is 7. This relationship provides a scientific and easy method for the design of pseudo-error statistics unit. In order to facilitate the practical application, but also gives the best design of the table when n is different values.