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IM/DD-OFDM/OQAM-PON system channel estimation method based on ANN_LS

A DD-OFDM and channel estimation technology, which is applied in the field of IM/DD-OFDM/OQAM-PON system channel estimation, can solve the problems of heavy calculation workload, achieve low complexity, reduce mean square error, and optimize the system performance effect

Pending Publication Date: 2021-11-05
XIAN UNIV OF POSTS & TELECOMM
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Problems solved by technology

In the ANN-based channel estimation algorithm, the neural network has three layers, including two hidden layers, and the computational workload is heavy

Method used

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  • IM/DD-OFDM/OQAM-PON system channel estimation method based on ANN_LS
  • IM/DD-OFDM/OQAM-PON system channel estimation method based on ANN_LS
  • IM/DD-OFDM/OQAM-PON system channel estimation method based on ANN_LS

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[0096] like figure 1 As shown, the electrical signal generated by the OFDM / OQAM transmitting end is modulated on a specific subcarrier through IFFT, and then the transmitted signal is modulated onto the optical carrier through Mach-Zehnder, and the upstream OFDM / OQAM signals of each channel are coupled into the optical fiber line transmission. After the optical signal is transmitted through a standard single-mode optical fiber, at the receiving end, the signal is received and demodulated by means of optical intensity modulation and direct detection. At the transmitter, encode the incoming binary data stream into baseband symbols a m，n , m=0, 1, 2, ..., M-1, n = 0, 1, 2, ..., N s -1 where M is the number of subcarriers, N s The number of baseband symbols. After QAM mapping, the real part and the imaginary part of the data symbol are extracted. Through IFFT transformation and prototype filter bank, the data is then converted into a serial data stream, and then the signal se...

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Abstract

The invention discloses an IM / DD-OFDM / OQAM-PON system channel estimation method based on ANN_LS, and the method comprises the steps: firstly collecting time domain data, and carrying out the forward propagation through the time domain data; carrying out reverse propagation by using a gradient descent algorithm to continuously adjust W and b of the algorithm so as to minimize the sum of squares of errors of the whole algorithm and further obtain a transfer function (TF) of the system; and finally, carrying out channel estimation by using LS in a frequency domain. Simulation results show that when the optical fiber transmission distance is long, compared with an algorithm based on ANN channel estimation, higher CE precision can be obtained based on the ANN_LS algorithm, and better system optimization performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and in particular relates to an IM / DD-OFDM / OQAM-PON system channel estimation method. Background technique [0002] OFDM-PON with cyclic prefix (CP) can effectively reduce intersymbol interference (Inter Symbol Interference, ISI) and polarization mode dispersion (Polarization Mode Dispersion, PMD) induced polarization caused by dispersion (CD) in optical fiber communication systems Crosstalk between. In addition, the subcarriers in the system are orthogonal to each other, so that different frequency spectrums can be overlapped without interference, and can effectively resist Inter Carrier Interference (ICI). However, the insertion of the CP will reduce the spectrum utilization rate of the system. Aiming at the defects in the OFDM-PON system, Orthogonal Frequency Division Multiplexing / Offset Quadrature Amplitude Modulation (OFDM / OQAM) is proposed in optical communication, which is ...

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Application Information

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IPC IPC(8): H04L25/02H04L27/26H04B10/2513H04B10/2569
CPCH04L25/0254H04L27/2695H04L27/2698H04B10/2513H04B10/2569Y02D30/70
Inventor 梁思远王雪粉赵芳利赵峰
Owner XIAN UNIV OF POSTS & TELECOMM
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