Orthogonal intersection amplitude modulation signal phase ambiguity processing method and apparatus

Abstract

The invention provides an orthogonal intersection amplitude modulation signal phase ambiguity processing method and apparatus. The phase ambiguity processing method comprises steps of judging symbols in the X polarization state and the Y polarization state of a reception signal, and carrying out mapping to obtain first bit information, wherein the reception signal comprises multiple first signals; carrying out verification analysis of the first bit information to generate a first verification result; judging the first verification result to obtain a judgment result that whether phase ambiguity occurs to the reception signal or not; when the judgment result shows that phase ambiguity occurs to the reception signal, obtaining at least one first signal in the reception signal; subjecting the first signal to phase rotation to obtain a second signal; carrying out verification analysis of the second signal, storing the second signal if the verification result is normal, and enabling the second signal to be used for decoding instead of the first signal. In the verification of the QAM signal, the QAM signal is corrected when phase ambiguity exists, so that the error rate of QAM signal differential decoding is lowered, the system expense is reduced, and the system performance is improved.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a method and device for phase fuzzy processing of quadrature amplitude modulation signals. Background technique [0002] In a high-speed communication system, there will be a phase ambiguity problem when phase modulation is used. There are several ways to solve it: one is the training sequence method applied in the absolute phase detection system, that is, the training sequence through the known phase Detect the phase ambiguity angle, and then correct the adjacent signal accordingly; this method can solve the phase ambiguity problem very well, but this method will increase the system overhead; the other is to use phase differential modulation to correct the phase ambiguity problem, but Compared with the training sequence method, there is a performance drop. [0003] In the four-dimensional modulation format based on polarization multiplexing (such as PM-MQAM, Polar...

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a phase ambiguity processing method and device for a quadrature amplitude modulation signal to solve the problem that the existing phase ambiguity correction method for a quadrature amplitude modulation signal will cause an increase in system overhead, High power consumption is not conducive to cost saving

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