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Co-channel interference canceler and control method therefor

An interference canceller and interference canceling technology, applied in the direction of high-definition television systems, TVs, color TV parts, etc., can solve problems such as motion ghosting or phase noise not eliminated, NRF control selection reliability is not optimal, etc.

Inactive Publication Date: 2003-05-21
SAMSUNG ELECTRONICS CO LTD
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0009] However, in the above patents, motion ghosting or phase noise is not eliminated, so the reliability of the NRF control selection is not yet optimal

Method used

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  • Co-channel interference canceler and control method therefor
  • Co-channel interference canceler and control method therefor
  • Co-channel interference canceler and control method therefor

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Embodiment Construction

[0021] figure 2 Among them, the tuner 202 converts a high-definition television (HDTV) signal passed through an antenna into an intermediate frequency (IF) signal of a predetermined frequency. Signals on adjacent channels can interfere with the signal on the desired channel. Thus, to avoid such interference, the output of tuner 202 is passed through a surface acoustic wave (SAW) filter 204 having a bandwidth of 6 MHz. Unit 206 adjusts the amplitude of the IF signal, demodulates the IF signal into a baseband signal using a pilot signal included in the IF signal, and converts the demodulated signal into a digital signal.

[0022] An NTSC anti-jamming canceller (NRF) 208 removes NTSC components from the output of unit 206 to avoid HDTV signal degradation due to NTSC signals. Here the NRF may consist of a comb filter of the ATSC standard and disclosed in US Patent 5,594,496, or various other types of filters such as a finite impulse response (FIR) filter, or a notch filter disc...

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Abstract

A co-channel interference canceler and a method therefor. The co-channel interference canceler includes: an NTSC interference rejection filter (NRF) for removing co-channel interference from an input signal; a noise reducer for reducing noise by removing interference other than co-channel interference from the input signal; and a selection controller for determining whether or not co-channel interference exists in the signal output from the noise-reducer and selecting the NRF when such co-channel interference exists in the noise reduced signal. Therefore, the effect from interference other than the co-channel interference is minimized, so that the co-channel interference controller is reliably controlled.

Description

technical field [0001] The present invention relates to a shared channel interference canceller and its method, more particularly to a shared channel interference canceller capable of reliably canceling shared channel interference in high-definition television (HDTV). Background technique [0002] Terrestrial Alliance Advanced Television (GA-TV) is a new digital TV transmission standard that can replace the NTSC (National Television System Committee) standard. The GA-AT system (also referred to as "GA-HDTV" or "GA-VSB") standardized by the Advanced Television Systems Committee (ATSC) adopts a vestigial sideband (VSB) modulation method as a digital transmission method. [0003] The new ATV signal is carried along with the traditional analogue TV signal (NTSC signal) over a TV channel ("taboo" channel) that is not used in a given geographic area. Accordingly, GA-ATV receivers must be designed to resist NTSC co-channel interference. [0004] The bl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04N5/21H04N5/44H04N7/015
CPCH04N5/211H04N5/21
Inventor 李命焕
Owner SAMSUNG ELECTRONICS CO LTD
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