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Channel equalization and frequency deviation estimation joint parallel method based on LMS

A frequency offset estimation and equalizer technology, applied in the baseband system, baseband system components, shaping network in the transmitter/receiver, etc.

Inactive Publication Date: 2014-05-07
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Application Information

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Problems solved by technology

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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  • Channel equalization and frequency deviation estimation joint parallel method based on LMS
  • Channel equalization and frequency deviation estimation joint parallel method based on LMS
  • Channel equalization and frequency deviation estimation joint parallel method based on LMS

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Embodiment

[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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Abstract

The invention discloses a channel equalization and frequency deviation estimation joint parallel method based on LMS. At the initialization phase of an optical receiver, train sequence signals are converted into parallel signals and are sent into parallel signal processing branches for balance and frequency deviation estimation. The frequency deviation estimation average value of all branches and an error signal of each branch are computed. A unified equalizer tap coefficient is used for each group of parallel signals. When the equalizer tap coefficient is updated, the average value of the branch error signals is used. At a data transmission phase, a transmitting end inserts train symbols into data symbols. The optical receiver converts data signals into parallel signals. The train signals use balance signals and known train symbols to carry out frequency deviation estimation. The data signals use accumulation phase error corresponding to the train signals and the acquired frequency deviation estimation average value to carry out compensation and decision, and uses the balance signals and decision signals to carry out frequency deviation estimation. According to the invention, signal parallel processing is used, which reduces the limitation influence of data signal processing hardware on the 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 intersym...

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Application Information

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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 ELECTRONIC SCI & TECH OF CHINA