Phase compensation control method for complex environment

Abstract

The invention discloses a phase compensation control method for a complex environment. The method comprises the steps that initialization operation is carried out on a sending end and a receiving end;each time after transmission work of a system is finished, before next-time transmission work is started, the system carries out two-point scan operation, namely, the sending end fixedly sends a phase M1 in random four-phase modulation of previous transmission, the receiving end alternately loads a phase M2 and a phase M3 in the random four-phase modulation of the previous transmission, and statistics is respectively carried out on interference count of the phase M1 and the phase M2, and the interference count of the phase M1 and the phase M3; and phase compensation quantity is computed according to the two times of count, and the phase compensation quantity is superposed to a four-phase voltage of next-time transmission. According to the method, under the condition of severely changed environment temperature and vibration, long distance transmission and relatively low data sample number, high performance and high efficiency transmission can be kept. Rapid drift of the phases can be accurately compensated, system phases are compensated timely, efficiency is relatively high, consumed time is short, and a system bit error rate is low.

Description

technical field [0001] The invention belongs to the technical field related to quantum secure communication, and specifically relates to a phase compensation control method for complex environments, wherein the complex environments include: temperature environment, vibration environment, long-distance transmission environment and the like. Background technique [0002] The current phase encoding quantum cryptography system mainly adopts the active phase compensation method for phase drift, which mainly includes two types: the first is through scanning, that is, the sending end fixes a phase, and the receiving end traverses a complete cycle to find The point where the phases at both ends match; the second is to calculate the phase drift through data analysis of the base discarded data, and to compensate the phase change in real time. [0003] The first method takes a long time to scan, and the general scan time is on the order of 100ms. [0004] The second method selects the...

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Problems solved by technology

[0003] The first method takes a long time to scan, and the general scan time is on the order of 100ms

[0004] The second method selects the data of a complete transmission for processing, and the phase drift is the average drift of a complete transmission time, and since data analysis is used, the calculation of the phase drift depends on the number of samples of statistical data, so when When the complex environment changes drastically or the number of statistical data samples is small, the second method cannot obtain correct phase compensation; the drastic changes in the complex environment refer to drastic changes in temperature, vibration frequency changes, and long-distance transmission distance changes; due to the second The phase drift of the first method is the average drift of a complete transmission time. Therefore, in the case of rapid temperature changes and excessive vibration frequency, the second method has system phase compensation that is not timely and inaccurate. The resulting high bit error rate of the system; in addition, long-distance transmission will lead to a decrease in the signal-to-noise ratio. Due to the influence of noise, the second method will cause a deviation in the calculation of the drift amount and affect the transmission performance. Therefore, the signal-to-noise ratio is low. In the case of , the second method cannot correctly compensate for the phase drift

[0005] In view of the above problems, it is necessary to propose a phase compensation control method for complex environments, so as to solve the time-consuming problem in the first method, the drastic changes in the complex environment and the small number of statistical data samples in the second method. The problem that the correct phase compensation cannot be obtained, and the complex environment includes: temperature environment, vibration environment, long-distance transmission environment, etc.

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