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Bidirectional frequency domain Turbo equalization method adopting expected propagation

An equalization method and frequency domain technology, applied in the transmission system, digital transmission system, forward error control, etc.

Active Publication Date: 2020-09-18
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is no increase in information redundancy when the signal passes through the channel, Turbo can only be used to suppress intersymbol interference and noise

Method used

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  • Bidirectional frequency domain Turbo equalization method adopting expected propagation
  • Bidirectional frequency domain Turbo equalization method adopting expected propagation
  • Bidirectional frequency domain Turbo equalization method adopting expected propagation

Examples

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Embodiment 1

[0092] This embodiment provides a two-way frequency-domain Turbo equalization method using desired propagation, such as figure 1 shown, including steps:

[0093] S1. Receive the transmission signal of the underwater acoustic or wireless channel, and use the EP soft mapping method to approximate the posterior distribution characteristics of the sign bits of the received signal;

[0094]S2. Using a two-way frequency domain soft equalization method to process the received signal to obtain out-of-balance information;

[0095] S3. Using the covariance-assisted two-way merging method to merge the two-way equilibrium out-of-balance information;

[0096] S4. Input the external information of the merging into the Log-MAP decoding decision method, obtain the external information of decoding, and input the external information of the decoding into the EP soft mapping method as a priori, and repeatedly execute steps S1- S4:

[0097] S5. Determine whether the number of iterations reache...

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Abstract

The invention discloses a bidirectional frequency domain Turbo equalization method adopting expected propagation, and the method comprises the steps: S1, receiving a transmission signal of an underwater acoustic or wireless channel, and approximately deducing the posteriori distribution characteristics of symbol bits of a received signal through employing an EP soft mapping method; S2, processingthe received signal by adopting a bidirectional frequency domain soft equalization method to obtain equalization external information; S3, combining the bidirectional equalization external informationby using a covariance-assisted bidirectional combination method; S4, inputting the combined external information into a Log-MAP decoding judgment method to obtain decoded external information, inputting the decoded external information into an EP soft mapping method as priori, and repeating the steps S1-S4; S5, determining whether the number of iterations reaches a preset number of iterations ornot, and if not, continuing to execute the steps S1-S4; and if so, determining decoding by utilizing a Log-MAP decoding judgment method, and outputting a decoding code word.

Description

technical field [0001] The invention relates to the technical field of digital communication, in particular to a two-way frequency-domain Turbo equalization method using desired propagation. Background technique [0002] With the continuous growth of communication requirements during ocean operations, marine communication technology needs to be continuously improved. The transmission medium of underwater acoustic communication is sound wave. Due to the limitations of the acoustic wave, the underwater acoustic channel has the characteristics of severe selective fading and extremely long delay spread, resulting in extremely serious intersymbol interference in the received signal. In order to solve the above problems, a Turbo equalization structure is introduced to process the received signal. Through the iteration of soft information between the equalization module and the decoding module, Turbo equalization can effectively solve the problem of crosstalk between signals, so ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L25/03H03M13/29
CPCH04L1/005H04L1/0055H04L1/0052H04L1/0059H04L1/0066H04L25/03159H03M13/2957Y02D30/70
Inventor 姜斌唐禹包建荣朱芳唐向宏
Owner HANGZHOU DIANZI UNIV
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