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Method and device for suppressing noise

A technology for noise suppression and noise suppression, applied in electrical components, transmission systems, baseband system components, etc., to solve problems such as low noise suppression efficiency and multipath information noise that cannot be suppressed.

Active Publication Date: 2007-02-07
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The invention provides a method and device for suppressing noise to solve the problem that the prior art may suppress multipath information and the efficiency of suppressing noise is low
[0013] Further, solve the problem that the noise mixed in the multipath information cannot be suppressed

Method used

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  • Method and device for suppressing noise

Examples

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example 1

[0064] Method Example 1: Only perform noise suppression for the first time.

[0065] Step 1. First extract the OFDMA symbol Y from the pilot pattern N (k), and implement pilot value sequence extraction on the OFDMA symbol, that is, store the value at the corresponding position of the received signal.

[0066] Step 2, taking the extracted values ​​at the pilot positions as a series of discrete sequences, and performing inverse Fourier transform IFFT on this sequence by formula (1).

[0067] G · M ( p ) = 1 L Σ m = 0 L - 1 H · m ( m ) e 2 ...

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Abstract

The invention relates to a method for restraining noise and a relative device, wherein said method comprises: A, obtaining the signal channel impact response sequence of extracted OFDMA mark; B, using preset maximum multi-path time delay to first restrain the noise on said signal channel impact response; and the inventive device comprises: a signal channel impact response sequence obtainer for obtaining said sequence; a filter unit for based on input filter information restraining the noise of obtained signal channel impact response sequence; a maximum multi-path time delay setter for setting the maximum multi-path time delay as the filter information to the filter unit when first restraining noise. The invention can improve the efficiency when restraining noise.

Description

technical field [0001] The invention relates to a broadband wireless communication device, in particular to a method and device for suppressing noise. Background technique [0002] Wireless channels in broadband wireless communication systems such as Orthogonal Frequency Division Multiple Access (OFDM / OFDMA) have frequency selectivity and time-varying characteristics. The system design of OFDM / OFDMA can ensure that the channel within an OFDM / OFDMA symbol interval is time-invariant. Due to the influence of multipath propagation, the channel within an OFDM / OFDMA symbol will have frequency selective fading, which is specifically reflected in different The channel factors on the subcarriers will be different, and the larger the carrier spacing, the greater the channel factor difference. In order to correctly demodulate the data of the data subcarriers, OFDM / OFDMA systems design scattered pilots for channel estimation. [0003] The existing technologies for channel estimation us...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26H04B15/02H04B1/707
Inventor 袁燕
Owner HUAWEI TECH CO LTD
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