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Time delay and time domain interleaving method for integrated services digital broadcasting-terrestrial (ISDB-T) system

A technology of time domain and bit interleaving, applied to TV system components, color TV components, TVs, etc., can solve the problems of high RAM cost, low read and write efficiency of external SDRAM, etc., and achieve the effect of reducing clock frequency

Active Publication Date: 2011-05-25
成都德芯数字科技股份有限公司
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Problems solved by technology

[0007] Aiming at the technical problems of the delay and time-domain interleaving methods in the prior art, the RAM cost inside the programmable device is relatively high, and the external SDRAM read and write efficiency is low. Therefore, it is necessary to provide an ISDB-T system delay A New Method of Interleaving with Time Domain

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  • Time delay and time domain interleaving method for integrated services digital broadcasting-terrestrial (ISDB-T) system
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  • Time delay and time domain interleaving method for integrated services digital broadcasting-terrestrial (ISDB-T) system

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Embodiment Construction

[0021] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] Such as figure 2 The delay and time domain interleaving method of the shown ISDB-T system, it comprises the following steps:

[0023] Step 1. Carrier deletion: delete the corresponding carrier length according to the length adjusted by the delay;

[0024] Step 2, carrier modulation: realize bit interleaving and bit-to-symbol mapping;

[0025] Step 3, time-domain interleaving: realizing convolutional interleaving according to different modes and interleaving lengths;

[0026] Preferably, in the step 1: the length of the deleted carrier = the total number of carrier data in one frame - the number of 120 carriers - the number of delayed carriers interleaved in the time domain;

[0027] Since the carrier data in the ISDB-T system is circulated in units of OFDM frames, if a frame of carrier data is lost when the device is ...

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Abstract

The invention relates to a time delay and time domain interleaving method for an integrated services digital broadcasting-terrestrial (ISDB-T) system, which comprises the following steps of: (1) carrier wave deletion: deleting corresponding carrier wave length according to the time relay regulation length; (2) carrier wave modulation: realizing bit interleaving and bit-to-symbol mapping; and (3) time domain interleaving: realizing convolutional interleaving according to different modes and interleaving lengths. The time delay and time domain interleaving method disclosed by the invention does not need additional memory devices to realize the data delay, and the same functions can be realized only through a small quantity of logical resources. Meanwhile, input carrier wave symbols respectively and simultaneously carry out input sequence regulation before and after domain interleaving, a plurality of carrier wave symbols are continuously read in rows, and the outburst of a plurality of data is realized.

Description

technical field [0001] The present invention relates to a Japanese digital television modulator ISDB-T (Integrated Services Digital Boardcasting) system, in particular to a delay and time-domain interleaving method of the ISDB-T system. Background technique [0002] The Japanese digital TV ISDB-T modulator is a TV standard introduced according to the characteristics of terrestrial transmission TV programs for the realization of terrestrial wireless transmission of TV programs. In the channel coding and modulation frame structure of this standard, interleaving is introduced to achieve anti-burst interference. Because interleaving will generate data delay, in order to make the transmitting end and the receiving end have a fixed time extension, delay adjustment is generally performed before and after interleaving. The delay adjustment used in the prior art before and after interleaving generally achieves the purpose of delay by storing data through storage elements. The stora...

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Application Information

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IPC IPC(8): H04N5/455
Inventor 李俊魏作贤
Owner 成都德芯数字科技股份有限公司
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