Mapping and interweaving method and system for digital television ground broadcast signal

Abstract

The present invention applies to the digital signal processing field, provides a mapping and interlacing method and system for digital television terrestrially broadcast signals. The method includes: acquiring interlacing mode information and modulating mode information corresponding to the input LDPC coding bit data; interlacing the LDPC coding bit data according to corresponding interlacing mode based on the interlacing mode information; based on the modulating mode information, when the modulation mode is one of 64QAM, 32QAM, 16QAM and 4QAM, directly performing constellation mapping of corresponding modulating mode to bit data after interlacing, and when the modulation mode is 4QAM-NR, firstly performing NR quasi-orthogonal pre-mapping and then performing 4QAM constellation mapping to the bit data after interlacing. The present invention, by firstly interlacing and then mapping the bit data stream together, decreases the bits of basic symbols during interlacing, can decrease the size of memory of the interlacing device, and does not require to increase additional module to realize according to the 4QAM-NR mode, thereby reducing the production cost.

Description

technical field [0001] The invention belongs to the field of digital signal processing, in particular to a mapping and interleaving method and system for digital TV terrestrial broadcasting signals. Background technique [0002] In digital TV terrestrial broadcasting, channel coding and modulation are of great significance. By adding redundant error detection and error correction information to the data stream, it improves the anti-interference ability of the data during transmission, reduces the bit error rate, and ensures Normal reception. In the existing channel coding and modulation standards of digital TV terrestrial broadcasting, constellation mapping and interleaving methods are commonly used channel coding techniques, which can perform five kinds of 64 quadrature amplitude modulation (QAM), 32QAM, 16QAM, 4QAM and 4QAM-NR Constellation mapping and two interleaving modes with an interleaving width and an interleaving depth of (52, 240) and (52, 720) respectively. [...

AI Technical Summary

Problems solved by technology

[0017] The object of the present invention is to provide a method and system for mapping and interleaving of digital TV terrestrial broadcasting signals, aiming at solving the problem of increasing the number of bits of data in the constellation mapping in the prior art and making the storage space required for interleaving larger, and For 4QAM-NR mode, additional modules need to be added to realize the problem of high production cost

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