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Device for inhibiting same frequency interferences of DTMB receiver

A technology of co-channel interference and suppression device, which is applied to shaping networks in transmitters/receivers, components of color TVs, components of TV systems, etc., can solve problems such as reducing the efficiency of communication systems without reducing communication efficiency.

Inactive Publication Date: 2012-07-11
SICHUAN PANOVASIC TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems and deficiencies that the CCI suppression method in the prior art reduces the efficiency of the communication system, and provide a same-frequency interference suppression device for DTMB receivers that does not reduce communication efficiency

Method used

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  • Device for inhibiting same frequency interferences of DTMB receiver
  • Device for inhibiting same frequency interferences of DTMB receiver
  • Device for inhibiting same frequency interferences of DTMB receiver

Examples

Experimental program
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Embodiment

[0034] In this example, if image 3 As shown, the same-channel interference suppression device for a DTMB receiver of the present invention includes a CCI detector 301 , a CCI notch filter 302 and a selector 303 .

[0035] 1. CCI detector

[0036] The CCI detector 301 receives the digital TV baseband signal r(n) and performs an autocorrelation operation to obtain the correlation value R rc (n):

[0037] R rc ( n ) = Σ k = 0 N p - 1 r * ( n + k ) r ( n + N l + k ) -...

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Abstract

The invention discloses a device for inhibiting same frequency interferences of a DTMB receiver, which comprises a CCI detector, a CCI notch filter and a selector. The CCI detector receives digital television baseband signals to perform self-correlation operation so as to obtain a correlation value Rrc(n); when a modulus of the CCI detector is more than or equal to a set threshold H0, the same frequency interferences exist; and when the modulus of the CCI detector is smaller than the set threshold H0, the same frequency interferences do not exist. The CCI notch filter receives the digital television baseband signals, filters luminance carriers, color sub-carriers and audio frequency sub-carriers of analog television signals in the baseband signals, and outputs the digital television baseband signals for inhibiting the same frequency interferences; and when the same frequency interferences exist, the selector selects the output of the digital television baseband signal for inhibiting the same frequency interferences, and when the same frequency interferences do not exist, the selector the output of the digital television baseband signals. Because the detection of the same frequencyinterferences is performed in a time domain, a detection result serves as a selective signal to gate the notch filter or not gate the notch filter, and the notch filtering of the digital television baseband signal is performed in a frequency domain, the detection calculating speed of the same frequency interferences does not influence the communication efficiency.

Description

technical field [0001] The invention belongs to the technical field of digital terrestrial multimedia broadcasting reception, and more specifically relates to a same-frequency interference suppression device for a DTMB receiver. Background technique [0002] DTMB, that is, digital terrestrial multimedia broadcasting, as a digital terrestrial television transmission standard, has been enforced in my country since August 2007. However, in some areas, open-circuit analog TV signals and terrestrial digital TV signals will coexist, which will cause interference to the demodulation of terrestrial digital TV signals. [0003] figure 1 It is the time waveform diagram of the analog TV signal in NTSC system. Such as figure 1 As shown, the analog TV signal is a periodic signal with the length of the line synchronization period, the period is about 64us; each period starts with a synchronization pulse, and the width is about 4.7us. figure 2 It is the power spectral density diagram ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/21H04L25/03
Inventor 刘光辉吴亮明谢翔
Owner SICHUAN PANOVASIC TECH
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