A joint parallel method for channel equalization and frequency offset estimation based on lms
A technology of frequency offset estimation and channel equalization, which is applied in baseband systems, components of baseband systems, shaping networks in transmitters/receivers, etc.
Inactive Publication Date: 2017-01-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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At the same time, the update of the tap coefficients of the equalizer and the frequency offset estimation algorithm based on pre-decision both require signal feedback, and the time delay caused by feedback in parallel implementation also has a great impact on the performance of the system.
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[0055] This embodiment still takes the 112Gb / s PDM-QPSK optical fiber transmission system as an example, and converts the 56G / s rate signal into multiple parallel signals through serial parallel conversion, here is 256 channels, so that the rate of each channel can be effectively reduced , which can reduce the difficulty of its physical realization. Since the sampling is doubled, each group of 256 signals will be determined to obtain 128 symbols. It can be seen that the number of parallel processing branches to be configured is N=128.
[0056] The work of the optical burst receiver is divided into two stages: initialization stage and data transmission stage. After detecting the arrival of the optical burst signal, the optical burst receiver first enters the initialization stage, and uses the training sequence to iteratively update the tap coefficients of the equalizer until convergence, and completes the initialization of the equalizer and the optical burst receiver. After th...
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The invention discloses a combined parallel method of channel equalization and frequency offset estimation based on LMS. In the initialization stage of the optical receiver, the training sequence signal is converted into a parallel signal and then sent to a parallel signal processing branch for equalization and frequency offset estimation respectively. Calculate the average value of the estimated frequency offset of all branches and the error signal of each branch. Each group of parallel signals adopts a unified equalizer tap coefficient, and the mean value of the branch error signal is used when the equalizer tap coefficient is updated; it is sent in the data transmission stage The end inserts training symbols into the data symbols, and the optical receiver converts the data signals into parallel signals. The training signal uses the equalized signal and known training symbols for frequency offset estimation, and the data signal uses the accumulated phase error of the corresponding training signal and the obtained frequency The average value of the offset estimation is compensated and then judged, and then the equalized signal and the judgment signal are used to estimate the frequency offset. The invention adopts signal parallel processing to reduce the limited influence of data signal processing hardware on system performance.
Description
technical field [0001] The invention belongs to the technical field of optical burst receivers, and more specifically relates to a joint parallel method of channel equalization and frequency offset estimation based on LMS (Least Mean Square, least mean square algorithm). Background technique [0002] In the current high-speed coherent optical communication system, PDM-QPSK (Polarization Multiplexing-Quadrature Absolute Phase Shift Keying) coherent optical transmission system is one of the most potential technical solutions. In the PDM-QPSK coherent optical transmission system, the transmission signal is mainly affected by the linear damage of the optical fiber's chromatic dispersion (CD) and polarization mode dispersion (Polarization Mode Dispersion, PMD) and the frequency offset generated by the laser at the transceiver end , these two problems seriously affect the performance of the optical receiver. The adaptive equalization technology can basically eliminate the intersy...
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IPC IPC(8): H04L25/02H04L25/03
CPCH04L25/03273H04L25/03114H04L2025/03636
Inventor 吴晨雨许渤刘芯羽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA