Method and device for eliminating co-channel interference in quadrature amplitude modulation signals

A quadrature amplitude modulation, co-channel interference technology, applied in the field of signal processing, can solve problems such as poor performance, and achieve the effect of eliminating co-channel interference

Inactive Publication Date: 2011-06-29
FUJITSU LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The conventional blind decision feedback equalization algorithm obtains effective error convergence by combining the constant modulus algorithm and the decision-guided minimum mean square error algorithm, but this method does not perform well in the case of co-channel analog signal interference

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  • Method and device for eliminating co-channel interference in quadrature amplitude modulation signals
  • Method and device for eliminating co-channel interference in quadrature amplitude modulation signals
  • Method and device for eliminating co-channel interference in quadrature amplitude modulation signals

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Embodiment Construction

[0020] Features and exemplary embodiments of various aspects of the invention will be described in detail below. The following description covers numerous specific details in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a clearer understanding of the present invention by showing examples of the present invention. The present invention is by no means limited to any specific configuration and algorithm presented below, but covers any modification, replacement and improvement of related elements, components and algorithms without departing from the spirit of the present invention.

[0021] The time-domain received signal including channel white noise and co-channel interference can be expressed as:

[0022] x R =x+x N +x C (1)

[0023]...

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Abstract

The invention discloses a method and a device for eliminating co-channel interference in quadrature amplitude modulation signals. The method for eliminating the co-channel interference in the quadrature amplitude modulation (QAM) signals comprises the following steps of: performing fast Fourier transform on time domain received signals to acquire frequency domain received signals corresponding to the time domain received signals; calculating the power spectrum density of each signal component in the frequency domain received signals, and eliminating the co-channel interference in the frequency domain received signals according to the comparison relationship between the power spectrum density of each signal component in the frequency domain received signals and a power spectrum density threshold value; and performing inverse fast Fourier transform on the co-channel interference eliminated frequency domain received signals to acquire co-channel interference eliminated time domain received signals.

Description

technical field [0001] The present invention relates to the field of signal processing, more specifically to a method and device for eliminating co-channel interference in quadrature amplitude modulation signals. Background technique [0002] Due to the advantages of frequency bandwidth, large capacity, multiple functions, low cost and strong anti-interference ability, the cable television network (CATV) based on the digital video broadcasting (DVB-C) standard of the cable transmission mode has developed rapidly, especially in China. Cable television networks cover most areas. However, due to the use of wired data transmission, the digital cable TV system faces the problem of co-channel signal interference when performing quadrature amplitude modulation and demodulation. These interference signals coming from other signal sources and appearing as analog signals (similar to sinusoidal signals) will significantly affect the quality of signal demodulation. [0003] A blind eq...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/36H04N7/10
Inventor 王琪滨湊真
Owner FUJITSU LTD
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