CHANNEL EQUALIZATION AND FREQUENCY OFFSET ESTIMATION JOINT PARALLEL METHOD BASED ON LMS

摘要

Disclosed is a channel equalization and frequency offset estimation joint parallel method based on an LMS. After a training sequence signal is converted into a parallel signal in an initialization stage of a photoreceiver, the signal is sent to a parallel signal processing branch, and equalization and frequency offset estimation are respectively performed on the signal; a frequency offset estimation average value of all the branches and an error signal of each branch are calculated; each group of parallel signals use a unified equalizer tap coefficient, and an average value of the branch error signals is used when the equalizer tap coefficient is updated; a sending end inserts a training symbol into a data symbol in a data sending stage; the photoreceiver converts a data signal into a parallel signal; a training signal uses an equalization signal and the known training symbol to perform frequency offset estimation; and the data signal uses an accumulated phase error of a corresponding training signal and the obtained frequency offset estimation average value to compensate and then to judge, and then uses the equalization signal and a judgement signal to perform frequency offset estimation. By employing parallel signal processing, the present invention reduces the limitations and influence of data signal processing hardware on the system performance.