A modulation method and system for co-fbmc/oqam

Abstract

The invention discloses a CO-FBMC / OQAM modulation method and system. The system comprises a descrambling pilot frequency module and a Kalman filtering compensation module. The descrambling pilot frequency module comprises a first pilot frequency unit and a second pilot frequency unit which are arranged at the two ends of a symbol mapping module respectively and used for removing inherent imaginarypart interference at the pilot frequency position and ensuring that each CO-FBMC / OQAM symbol is provided with a pilot symbol which is used for recording phase noise superimposed on the pilot symbol;and the Kalman filtering compensation module extracts the test pilot symbol of a receiving end, corrects the prediction process of the pilot symbol, obtains the phase noise estimation value at the current moment, and outputs the estimation value of the receiving end signal. The technical scheme has the capability of eliminating the inherent interference at the pilot position, and meanwhile, the Kalman filtering processing module only needs one pilot for operation, so that the technical scheme reduces the calculation amount and the capability of reducing the judgment error.

Description

technical field [0001] The invention belongs to the field of optical communication, and more specifically relates to a CO-FBMC / OQAM modulation method and system. Background technique [0002] Although the Coherent Optical-offset Quadrature Amplitude Modulation-based filter bank multicarrier (CO-FBMC / OQAM: Coherent Optical-offset Quadrature Amplitude Modulation-based filter bank multicarrier) system in traditional optical communication eliminates the cyclic prefix to a certain extent It is better than the CO-OFDM system, but because the CO-FBMC / OQAM system has a longer symbol length and a high peak-to-average power ratio, and the phase noise mainly comes from the laser line width and link nonlinearity, the CO-FBMC / OQAM system The transmission performance of the transmission is easily affected by the phase noise, resulting in the rotation and divergence of the QAM modulation constellation diagram at the receiving end, resulting in an increase in the bit error rate. Therefore,...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to add a descrambling pilot module at the fixed subcarrier position after the symbol mapping module at the system sending end, and to add a corresponding pilot after the optical domain-frequency domain conversion module at the system receiving end The Kalman filter processing module is added to the position to solve the estimation error caused by the system's inherent imaginary part interference to the pilot and the corresponding phase noise compensation problem at the receiving end

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