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Judgment Method of Physical Layer Bandwidth of Terrestrial Digital Broadcasting TV Signal Based on Occupied Bandwidth Measurement

A technology of terrestrial digital broadcasting and television signals, applied in digital transmission systems, electrical components, data exchange networks, etc., can solve problems such as unconsidered

Active Publication Date: 2019-08-09
HEFEI UNIV OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0005] This method does not consider that in the field of digital signals, the frequency points are discrete, and there are non-integer points at the start and stop frequency points, how to calculate the power value more accurately

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  • Judgment Method of Physical Layer Bandwidth of Terrestrial Digital Broadcasting TV Signal Based on Occupied Bandwidth Measurement
  • Judgment Method of Physical Layer Bandwidth of Terrestrial Digital Broadcasting TV Signal Based on Occupied Bandwidth Measurement
  • Judgment Method of Physical Layer Bandwidth of Terrestrial Digital Broadcasting TV Signal Based on Occupied Bandwidth Measurement

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Embodiment Construction

[0078] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0079] In an embodiment, the selected input signal is a DVB-T baseband time domain signal; the sampling frequency f when sampling the DVB-T baseband time domain signal s Take 12.5MHz, signal bandwidth B w 12.5MHz; DVB-T time domain signal time length T is 1ms.

[0080] figure 1 It is a schematic flow chart of the basic method of the present invention. As can be seen from this figure, the present invention mainly comprises the following steps:

[0081] Step 1: Sampling the DVB-T baseband time-domain signal with a total time length of 1 ms at a sampling frequency of 12.5 MHz to obtain a bandwidth of B w , the amount of data is N all DVB-T baseband time-domain sampling data r, where N all is the total number of DVB-T baseband time domain samples.

[0082] Step 2: Perform windowing and fast discrete Fourier transform processing on the DVB-T ...

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Abstract

The invention provides a ground digital broadcasting television signal physical layer bandwidth determining method based on occupied bandwidth measurement. Bandwidths of two sides of central frequency of 99% power proportion almost comprise a signal main lobe width according to a result of a simulation experiment, and therefore the above mentioned method is firstly used for sampling ground digital broadcasting television signal base band time domain signals. Ground digital broadcasting television signal base band time domain sampling data is converted into frequency domain data to calculate 0.8Bw bandwidth total power. The 99% power proportion bandwidth is calculated in two phases, and in the first phase, rough positions of 0.5% power proportions of a left side and a right side of interval segments are quickly and effectively positioned, and in the second phase, accurate positioning in the intervals is carried out to find the starting position and the end position of the proportion bandwidth. The physical layer bandwidth mode of the ground digital broadcasting television signal is determined according to a measured bandwidth value.

Description

technical field [0001] The invention relates to the field of digital broadcasting. Aiming at multiple physical layer bandwidths of terrestrial digital broadcasting television signals, a method for judging physical layer bandwidths of terrestrial digital broadcasting television signals based on occupied bandwidth measurement is proposed. Background technique [0002] With the rapid development of computer technology and image processing technology, digital processing technology has achieved great success. Compared with analog TV, digital TV can provide consumers with better program quality and better audio-visual experience. In general, there are different modes for the physical layer bandwidth of terrestrial digital broadcast television signals. For example, the terrestrial digital television broadcasting (DVB) standard is the most widely used and most mature digital television transmission standard in the world at present, and adopts the orthogonal frequency division multip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/26H04B17/30
CPCH04B17/30H04L43/0894
Inventor 孔慧芳吴陈成张子煜张闯彭虎
Owner HEFEI UNIV OF TECH
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