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Blind channel equalization method and device, computer storage medium and computing equipment

An equalization method and blind channel technology, applied in the field of communication, can solve the problems of low spectrum utilization rate of PDM-CO-OFDM system, and achieve the effects of accelerating convergence speed, improving spectrum utilization rate, and improving efficiency

Active Publication Date: 2021-08-13
CHINA MOBILEHANGZHOUINFORMATION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a blind channel equalization method and device, computer storage medium and computing equipment to solve the PDM-CO-OFDM system spectrum caused by using pilot signals or training sequences for channel equalization in the prior art The problem of low utilization

Method used

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  • Blind channel equalization method and device, computer storage medium and computing equipment
  • Blind channel equalization method and device, computer storage medium and computing equipment
  • Blind channel equalization method and device, computer storage medium and computing equipment

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Embodiment 1

[0066] In practical applications, when the PDM-CO-OFDM system only considers the linear damage of the optical fiber, the frequency domain data of a single subcarrier can adopt but not limited to the 2×2 multiple-input multiple-output ( Multiple-InputMultiple-Output, MIMO) OFDM model to describe:

[0067]

[0068] in, Represents the q-polarized data received by the receiving end on the i-th subcarrier; Represents the p-polarized data sent by the transmitter on the i-th subcarrier; Characterize the channel frequency response matrix of the i-th subcarrier.

[0069] In the PDM-CO-OFDM system, within an OFDM symbol period, the fiber channel changes very slowly with time, and the channel frequency response hardly changes with time. At this time, the data sent by the sender on the i-th subcarrier can be reverted to:

[0070]

[0071] in, Represents the q-polarized data received by the receiving end on the i-th subcarrier; Represents the p-polarized data sent by the t...

Embodiment 2

[0101] The above-mentioned embodiment will be described in further detail below, refer to figure 2 As shown, in Embodiment 2 of the present invention, the specific flow of the blind channel equalization method is as follows:

[0102] Step 200: After receiving the OFDM signal, perform symbol synchronization, carrier frequency estimation and dispersion compensation processing on the received OFDM signal, and then transform it into N OFDM symbols through FFT.

[0103] Step 201: Perform blind CPE compensation for N OFDM symbols, and average and whiten the frequency domain data of each subcarrier corresponding to the N OFDM symbols after blind CPE compensation.

[0104] Step 202: Perform step 203 to step 207 sequentially for each subcarrier corresponding to N OFDM symbols until the target channel frequency response inverse matrix of each subcarrier is obtained.

[0105] Step 203: Obtain the inverse matrix of the initial channel frequency response of the subcarriers. Among them, ...

Embodiment 3

[0112] Based on the above-mentioned embodiments, Embodiment 3 of the present invention provides a blind channel equalization device for performing blind channel equalization on a PDM-CO-OFDM system. Refer to image 3 As shown, the blind channel equalization device at least includes:

[0113] A preprocessing module 300, configured to perform preprocessing on the received OFDM signal to obtain N OFDM symbols;

[0114] The optimization module 301 is configured to perform the following operations sequentially for each subcarrier corresponding to the N OFDM symbols until the target channel frequency response inverse matrix of each subcarrier is obtained:

[0115] Obtain the initial channel frequency response inverse matrix of the subcarriers, wherein the initial channel frequency response matrix of the first subcarrier is obtained based on the frequency domain data of the first subcarrier in N OFDM symbols, except for the first subcarrier The initial channel frequency response inv...

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Abstract

The invention discloses a blind channel equalization method and device, computer storage medium and computing equipment, which are used to solve the problem of low system frequency spectrum utilization in the channel equalization method in the prior art. The method is as follows: aiming at the received OFDM signal Perform preprocessing, after obtaining N OFDM symbols, obtain the target channel frequency response inverse matrix of each subcarrier in turn, and use the target channel frequency response inverse matrix and frequency domain data of each subcarrier to restore the sending end on the corresponding subcarrier In the process of obtaining the target channel frequency response inverse matrix for the transmitted data, the error estimation is used to adaptively adjust the iterative step size during iterative optimization, which speeds up the convergence speed of iterative optimization and improves the efficiency of blind channel equalization. Moreover, when using In the process of recovering the data sent by the transmitting end on each subcarrier by the inverse matrix of the frequency response of the target channel, there is no need to use pilot signals or training sequences, which effectively improves the utilization rate of the system spectrum.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a blind channel equalization method and device, a computer storage medium and a computing device. Background technique [0002] At present, Orthogonal Frequency Division Multiplexing (OFDM) technology has become a high-speed long-distance communication system and optical One of the technologies that has received much attention in the field of transmission systems. Among them, the Polarization Division Multiplexed-Coherent Optical-OFDM (Polarization Division Multiplexed-Coherent Optical-OFDM, PDM-CO-OFDM) system utilizes the characteristics that the single-mode fiber can support two polarization states to transmit simultaneously, and the polarization multiplexing ( The Polarization Division Multiplexed (PDM) technology is used in a coherent optical orthogonal frequency division multiplexing (Coherent Optical-OFDM, CO-OFDM) system, which doubles the transmission rate. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
CPCH04B10/6162H04L25/03006H04L25/03159H04L2025/03611H04L2025/03687
Inventor 顾欣陈健王亚莱
Owner CHINA MOBILEHANGZHOUINFORMATION TECH CO LTD