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Method for pulse interference detection and elimination

A pulse interference and synchronous detection technology, applied in the field of data communication, can solve the problems of high implementation complexity and high probability of misjudgment, and achieve the effect of reducing performance loss

Active Publication Date: 2011-09-28
MAXSCEND MICROELECTRONICS CO LTD
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Problems solved by technology

[0013] In the existing DVB-T system pulse interference detection and elimination method, a, q, m, p need to be properly selected, and the probability of misjudgment is high, additional storage is required, and the implementation complexity is relatively large

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  • Method for pulse interference detection and elimination

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Embodiment Construction

[0031] In an embodiment of the pulse interference detection and elimination method of the present invention, two steps of pulse interference detection and pulse interference elimination are included.

[0032] Step 1, pulse interference detection. The schematic diagram of the pulse interference detection algorithm is as follows: figure 2 shown.

[0033] In the case of PN420 and PN945 in the PN part of the Chinese national standard DTMB, there is a 3dB increase in the average power. In order to avoid being misjudged as pulse interference, and to reuse a set of resources with PN595, only non-PN data is used for pulse interference detection. .

[0034] The input data is time-domain I and Q two-way orthogonal data, denoted as I(n), Q(n). After synchronously detecting the position of the frame header, an accumulator is used to record the absolute value sum of the I and Q two-way data, that is,

[0035] Sum(n)=Sum(n-1)+D(n)-threshold (Formula 1)

[0036] Where D(n)=|I(n)|+|Q(n)...

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Abstract

The invention discloses a method for pulse interference detection and elimination. The method comprises the following steps: step one, pulse interference detection: recording absolute values and Sum (n)s of orthogonal data of path I and path Q, finding out a maximum Sum (n) and a minimum Sum (n) of a present frame, and recording the maximum Sum (n) as MaxVal and the minimum Sum (n) as MinVal respectively; recording found sequence numbers MaxIdx and MinIdx respectively corresponding to the MaxVal and MinVal in the present frame; if (MaxVal-MinVal) / (MaxIdx-MinIdx) is greater than Slope, and (MaxIdx-MinIdx) is also greater than Width, there being pulse interference with an interference interval of [MinIdx, MaxIdx]; otherwise, there being no pulse interference; and step two, pulse interference elimination: selecting an offset interval of pulse interference, chasing a sampling point, and comparing the sampling point with MeanSum*ThreRatio within the selected offset interval. According to the invention, whether there is pulse interference or not can be detected effectively, and performance loss caused by the pulse interference can be reduced. Therefore, the method for pulse interference detection and elimination provided in the invention is suitable for all data communication systems.

Description

technical field [0001] The invention relates to the field of data communication, in particular to a pulse interference detection and elimination method for a data communication system. Background technique [0002] In today's situation where multiple data communication systems coexist, mutual interference often occurs. Compared with the terrestrial digital broadcasting system, the TDD system will present the characteristics of burst pulses. [0003] The ability of the European DVB system to resist pulse interference has made clear requirements. China's national standard DTMB terrestrial digital TV broadcasting system also puts forward specific requirements for anti-pulse interference. [0004] From the perspective of test standards, the so-called pulse interference refers to intermittent Gaussian noise, which has continuous characteristics in the time interval with interference, and the Gaussian noise can drown the signal. The part of the signal interfered by Gaussian noi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 蒋朱成李庆军汪涛张帆
Owner MAXSCEND MICROELECTRONICS CO LTD
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