Regulating method of receiving device crucial electrical level in digital communication system and its device

Abstract

This invention provides an adjustment method and a device for the judgment level of a receiving device in a digital communication system including obtaining the EC counting values of bit 0 and bit 1 of the EC unit of a receiving device to carry out related adjustment to the judgment level of the receiving device based on the difference between the two values. This invention utilizes the quiet relation between the difference of counting values of bit 0 and bit 1 of the EC unit and the judgment level to adjust the judgment level.

Description

technical field [0001] The invention relates to the technical field of digital communication, in particular to a method and device for adjusting the decision level of a receiving device in a digital communication system. Background technique [0002] In a digital communication system, the sending end converts the data into a sequence of "0" and "1" digital signals and sends them out. These digital signals will be distorted by factors such as transmission channels and noise during long-distance transmission. , The receiving device generally adopts methods such as filtering and signal "0" and "1" identification to ensure the reliability of the receiving system to receive signals. [0003] The method is specifically as follows: the receiving device first filters the received signal, and uses the identification circuit to identify "0" and "1" on the filtered signal. The identification circuit is generally composed of a limiting amplifier and a sampling decision device. The limi...

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Problems solved by technology

[0010] The relationship between the decision level and the bit error rate calculated above is as attached figure 2 shown, from figure 2 It can be clearly seen from the figure that the relationship between the decision level and the bit error rate is not monotonous. When adjusting the decision level, the CDR cannot directly adjust the corresponding decision level according to the bit error rate. It needs multiple attempts to adjust, and this Such an attempt to adjust is risky, such as according to figure 2 , assuming that the current judgment level is 0.6, the bit error rate is 10E-9 at this time, and when the trial judgment level is 0.8, the bit error rate is 1E-4, so that the bit error rate deteriorates, resulting in a large number of bit errors

[0011] Moreover, when the above-mentioned adjustment method of the judgment level has an instantaneous burst error in the signal received by the receiving device, the judgment level adjusted according to the burst error may cause the reception error of the normal signal, thereby deteriorating the bit error rate.

[0012] To sum up, the existing method for adjusting the decision level is complex and costly, and because the basis for adjusting the decision level is not monotonous, it is difficult to determine the initial value of the decision level, and the decision level It is prone to shock phenomenon and poor stability, so that the reliability of the receiving device is poor

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