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A Blind Channel Estimation Method in ofdm System in Impulse Noise Environment

An impulsive noise and blind channel technology, applied in the field of channel estimation, can solve problems such as impulsive noise processing

Inactive Publication Date: 2016-06-22
NINGBO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the impact of external interference such as impulse noise on the communication system is becoming more and more serious. How to accurately and effectively estimate the channel information in the impulse noise environment is imperative, but most of the existing methods are channel estimation in the Gaussian white noise environment. , does not handle impulse noise well

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  • A Blind Channel Estimation Method in ofdm System in Impulse Noise Environment

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Embodiment 1

[0042] The present invention utilizes the cyclostationary characteristics of OFDM signals to propose a blind channel estimation method in an OFDM system under an impulse noise environment. The received signal after processing; then, calculate the autocorrelation function and the periodic autocorrelation function of the received signal after preprocessing; then, do the z transformation of the delay variable to the periodic autocorrelation function of the received signal after preprocessing, and obtain the preprocessing The cyclic spectral function of the received signal after preprocessing; finally, according to part of the spectrum information in the cyclic spectral function of the preprocessed received signal, the blind estimation of channel information is realized. Specifically include the following steps:

[0043] ① The block diagram of the blind channel estimation model of the OFDM system under the environment of impulse noise is as follows: figure 1 As shown, at the tran...

Embodiment 2

[0062] The blind channel estimation method given in this embodiment is based on the blind channel estimation method in Embodiment 1, and then repeat steps ① to ⑩ in Embodiment 1 for 50 to 100 times, and then calculate each calculation The average value of the sum of the obtained channel estimation values ​​is used as the final channel estimation value.

[0063] The feasibility and effectiveness of the blind channel estimation method of the present invention can be further illustrated by the following simulation results.

[0064] Simulation conditions: the number of subcarriers of the OFDM signal sent by the OFDM signal sender M=32, the length of the cyclic prefix of the OFDM signal sent by the OFDM signal sender L=8, then it can be known that the OFDM signal sent by the OFDM signal sender is added The cycle period of the OFDM symbol with a cyclic prefix is ​​P=M+L=40, using QPSK modulation and demodulation, and the channel is equivalent to an FIR filter, then the impulse respo...

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Abstract

The invention discloses a blind channel estimation method in an OFDM (Orthogonal Frequency Division Multiplexing) system under a pulse noise environment. The method comprises the steps of firstly preprocessing OFDM signals received by the receiving end of the OFDM system to obtain preprocessed received signals; then calculating the self-correlation function and the periodic self-correlation function of the preprocessed received signals; conducting delay variable z-transform to the periodic self-correlation function of the preprocessed received signals to obtain the cyclic spectrum function of the preprocessed received signals; and lastly, according to partial spectrum information in the cyclic spectrum function of the preprocessed received signals, realizing the blind estimation of channel information. The blind channel estimation method has the advantages that the calculation complexity is low and the channel information under the pulse noise environment can be accurately and effectively estimated by using partial nonzero spectrum information only at the receiving end of the OFDM signals.

Description

technical field [0001] The present invention relates to a channel estimation method, in particular to a blind channel estimation method in an OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system under an impulse noise environment. Background technique [0002] The interference problem is one of the important factors affecting the system indicators such as the transmission rate and quality of the wireless communication network, so the interference problem has always been paid attention to. In the actual environment, there are many interferences, which are mainly divided into internal interference of the communication system and external interference of the communication system. The internal interference of the communication system mainly includes co-channel interference, adjacent frequency interference, multiple access interference, etc.; the external interference of the communication system comes from nature, including pulse in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 洪顺利李有明皱婷陈斌刘小青
Owner NINGBO UNIV
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