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Method for detecting carrier mode

A mode and carrier technology, applied in the direction of image communication, selective content distribution, electrical components, etc., can solve the problems of mode judgment failure and judgment error

Inactive Publication Date: 2012-11-21
HIMAX MEDIA SOLUTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Although the single-carrier and multi-carrier modes can be determined simply by the first 4 symbols of the above-mentioned data body, since frames are generally interfered by noise or multi-path during transmission, the mode determination is often impossible. conduct or misjudgment occurs

Method used

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Embodiment Construction

[0019] In the system information listed in the aforementioned Table 1, the number of (32) symbols in each system information is much more than the number of (4) symbols in the single / multi-carrier mode bits, so it has greater error tolerance or noise immunity . According to the detection of the system information, the embodiment of the present invention can determine whether the transmitted frame sequence belongs to single-carrier modulation, multi-carrier modulation or invalid signal.

[0020] image 3 A flowchart showing an embodiment of the present invention for detecting single carrier modulation, multi-carrier modulation or invalid signals. First, in step 31A, time-domain equalization (equalization) is performed on the system information of the received frame, which is mainly used to reduce the impact caused by multi-path. Next, in step 30A, the system information is decoded, and according to the decoding result, it is determined whether the received frame belongs to th...

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Abstract

The invention relates to a method for detecting carrier mode. The method for detecting the carrier mode is applicable to a digital terrestrial multimedia broadcast (DTMB) system. The method for detecting the carrier mode comprises the following steps of: decoding system information of a receiving frame for the first time; according to a result of the first-time decoding, performing single carriermode judgment on the receiving frame; if the receiving frame does not belong to the single carrier mode, converting the frame into frequency domain; decoding system information of the frame for the second time; and according to a result of the second-time decoding, performing multi-carrier mode judgment on the receiving frame.

Description

technical field [0001] The present invention relates to digital television broadcasting, in particular to a method for detecting single-carrier mode or multi-carrier mode in digital terrestrial multimedia broadcasting (DTMB) system. Background technique [0002] The Digital Terrestrial Multimedia Broadcast (DTMB for short) system is one of various digital television broadcast systems, and is mainly used in China. In the DTMB system, each frame (frame) or packet (packet) is mainly composed of a header (header) and a data body (body). Since the header is mainly generated by a pseudorandom number (PN), the header is generally referred to as PN for short. Depending on the length of the head, the DTMB system mainly has the following PN specifications: PN420, PN945, PN595. For example, the header length of the PN420 specification is 420 symbols (symbol) or bits, plus 3780 symbols of the data body, so each frame has a total of 4200 symbols; the header length of the PN945 specific...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/438
Inventor 李升龙
Owner HIMAX MEDIA SOLUTIONS