Method for estimating pulse noise in OFDM (Orthogonal Frequency Domain Multiplexing) underwater acoustic communication system

A technology of underwater acoustic communication and impulse noise, which is applied in the transmission system, baseband system, multi-frequency code system, etc., and can solve the problems of reducing the correct estimation of carrier frequency offset and interference of impulse noise estimation, etc.

Active Publication Date: 2016-01-06
云南保利天同水下装备科技有限公司
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Problems solved by technology

However, in the underwater acoustic communication system, the ICI is caused by the carrier frequency offset, and the estimation of the impulse noise in the frequency domain is bound to be disturbed; on the other hand, although the impulse noise is sparse in the time domain, it is The projection of FFT (FastFourierTra

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  • Method for estimating pulse noise in OFDM (Orthogonal Frequency Domain Multiplexing) underwater acoustic communication system
  • Method for estimating pulse noise in OFDM (Orthogonal Frequency Domain Multiplexing) underwater acoustic communication system
  • Method for estimating pulse noise in OFDM (Orthogonal Frequency Domain Multiplexing) underwater acoustic communication system

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[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] The impulsive noise estimation method in an OFDM underwater acoustic communication system proposed by the present invention, its overall realization block diagram is as follows figure 1 As shown, it includes the following steps:

[0030] ① At the sending end of the OFDM underwater acoustic communication system, the sending end sends OFDM signal vector X, and X reaches the receiving end after being transmitted through the underwater acoustic channel, where the dimension of X is K×1, K≥1, and the underwater acoustic channel includes multiple Sub-paths generally include more than 10 sub-paths, and the Doppler frequency shift factors of each sub-path are different. During the transmission of X through the underwater acoustic channel, external interference and internal interference will be encountered. External interference includes Gaussian...

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Abstract

The invention discloses a method for estimating pulse noise in an OFDM (Orthogonal Frequency Domain Multiplexing) underwater acoustic communication system. At a receiving end, sparse estimation is performed on pulse noise on an OFDM signal in an underwater acoustic channel transmission process according to a frequency domain signal subjected to redundant Doppler frequency shift compensation, and frequency offset compensation is performed on the frequency domain signal subjected to the redundant Doppler frequency shift compensation with void subcarriers. Under the consideration of mutual interference between the pulse noise and a carrier frequency offset in underwater acoustic communication, compensation of the carrier frequency offset is added in an iteration process while the pulse noise is estimated with all subcarriers and a posteriori distribution under a framework of conventional sparse Bayesian learning, and the frequency domain signal subjected to the redundant Doppler frequency shift compensation and a measurement diagonal matrix for estimating the pulse noise are updated continuously in order to lower influences between the two types of interference. Moreover, the pulse noise is estimated by full utilization of all the subcarriers in the method, so that the spectrum efficiency and the performance of the communication system are improved.

Description

technical field [0001] The present invention relates to an impulse noise estimation technique, in particular to an impulse noise estimation method in an OFDM (Orthogonal Frequency Domain Multiplexing, Orthogonal Frequency Division Multiplexing) underwater acoustic communication system. Background technique [0002] Impulse noise is a common noise in communication systems. In systems such as power line communication, wireless communication, and graphics processing, the suppression of impulse noise is a popular research direction. Also in the field of underwater acoustic communication, pulse interference also exists on the underwater acoustic channel, such as thermal noise, waves in the sea, tweets of marine organisms, ship transportation, human construction in the ocean, etc. will all generate pulse noise. Impulse noise has the characteristics of short duration, large energy and randomness, which has a serious impact on the transmission and reception of acoustic signals, and ...

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Application Information

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IPC IPC(8): H04L27/26H04L27/00H04L25/03
CPCH04L25/03821H04L27/0014H04L27/2647H04L27/2657H04L2027/0026
Inventor 李程程李有明常生明李婷闫玉芝
Owner 云南保利天同水下装备科技有限公司
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