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Signal processing method and receiver suitable for digital television broadcasting system

A signal receiver and signal processing technology, applied in multi-carrier systems, etc., can solve problems such as LDPC decoder 14 decoding failure

Inactive Publication Date: 2017-03-15
MSTAR SOFTWARE R&D (SHENZHEN) LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the environment of the corresponding QAM channel changes, this fixed scaling ratio R SCALING , but it may cause LDPC decoder 14 to fail to decode

Method used

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  • Signal processing method and receiver suitable for digital television broadcasting system
  • Signal processing method and receiver suitable for digital television broadcasting system
  • Signal processing method and receiver suitable for digital television broadcasting system

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Embodiment Construction

[0045] figure 2 A receiver 20 suitable for DVB-T2 is shown as an embodiment of the invention. The receiver 20 is suitable for DVB-T2 and includes an automatic gain controller (auto gain controller, AGC) 22, an adjacent channel interference (adjacent-channel interference, ACI) suppressor 24, an equalizer (eqaulizer, EQ) 26, data The frame demapper (frame demapper) 28 , demodulation and scaling devices (demapping and scaling) 29A, 29B . . . , LDPC decoder 34 , and BCH decoder 36 .

[0046] In the specifications stipulated by DVB-T2, at the transmitting end, the data is first prepared in several baseband frame BBFRAMEs, and then each baseband frame BBFRAME is encoded with BCH first, and some external code. Then according to the LDPC code, some internal codes are interpolated to generate a forward error correction data frame (FECFRAME). In other words, each FECFRAME is a baseband data frame BBFRAME, which is the result of adding some information for debugging according to FEC....

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Abstract

The invention relates to a signal processing method applicable to a digital television broadcasting system and a receiver. The modulating signal processing method is provided to be applied to the signal receiver. The method comprises the steps that the modulating signal is demodulated through soft decisions, and a plurality of original probable values are generated; a scaling ratio is provided, the original probable values are scaled according to the scaling ratio to generate a plurality of scaled probable values; the scaling ratio is updated according to a statistical result of the scaled probable values.

Description

technical field [0001] The present invention relates to a scaling method and related device related to log likelihood ratio (LLR), especially a method and related device that can automatically update a scaling ratio used for log likelihood ratio (LLR). Background technique [0002] The European digital television broadcasting (DVB-T) system is the most widely used digital television terrestrial broadcasting system in the world. However, this system was established in the early days. In recent years, modulation technology and integrated circuit design technology have made great progress. In the early days, it was considered that the calculation complexity was too high to meet the cost requirements. The error correction code technology has The better error correction capability of the system can improve the system capacity (Capacity) and thus improve the bandwidth utilization efficiency, and it is also considered to be used in the receiver of the communication system at presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/38
Inventor 赖思翔赖科印
Owner MSTAR SOFTWARE R&D (SHENZHEN) LTD