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Orthogonal frequency-division multiplex multi-carrier modulation method for digital television signals

A digital TV signal and multi-carrier modulation technology, applied in multi-carrier systems, high-definition TV systems, etc., can solve problems such as long convergence time, poor ISI effect, and complex structure

Inactive Publication Date: 2004-02-11
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The equalizer technology is relatively mature and is widely used in various communication fields, but it has two disadvantages: one is that the structure is complex and the cost is higher; The ISI effect is relatively poor
Therefore, COFDM uses an iterative approximation algorithm, which has a large convergence error and a long convergence time

Method used

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  • Orthogonal frequency-division multiplex multi-carrier modulation method for digital television signals
  • Orthogonal frequency-division multiplex multi-carrier modulation method for digital television signals
  • Orthogonal frequency-division multiplex multi-carrier modulation method for digital television signals

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Embodiment Construction

[0041] Specific embodiments of the present invention will be described in detail below in conjunction with accompanying drawings:

[0042] According to the OFDM multi-carrier modulation method of the present invention, the signal mainly includes a time-domain synchronization header and a signal frame body.

[0043] The baseband signal of the frame body is an Orthogonal Frequency Division Multiplexing (OFDM) block. An OFDM block can be further divided into a guard interval and a DFT block, such as figure 2 shown.

[0044] According to the embodiment of the OFDM multi-carrier modulation method of the digital television signal of the present invention, as image 3 As shown, it includes the following steps:

[0045] (a) performing serial-to-parallel conversion on the serial TS code stream to make it into a parallel TS code stream;

[0046] (b) performing quadrature phase modulation on the parallel TS code stream;

[0047] (c) performing an inverse discrete Fourier transform ...

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Abstract

An orthogonal frequency-division multiplexing multi-carrier modulation method for digitalized TV signals includes converting serial TS code stream to parallel TS code stream, orthogonal phase modulation, perform TDFT, frequency domain interlacing, and parallel-serial conversion. Its advantages are low convergence error and short convergenic time.

Description

technical field [0001] The invention belongs to the technical field of digital TV signal modulation, in particular to a time-domain synchronous OFDM multi-carrier modulation method in a terrestrial digital multimedia TV broadcasting system. Background technique [0002] For the TV transmission system, on the basis of analog TV, after more than ten years of unremitting research and development, Digital Television Terrestrial Broadcasting (DTTB) has achieved many achievements and reached the stage of realization. Since November 1998, DTTB programs have been broadcast in North America and Europe, and many countries have announced their DTTB system selection and implementation plans. Currently, there are three main DTTB transmission standards in the world: [0003] 1) ATSC (Advanced Television Systems Committee) digital TV standard in the United States. [0004] 2) European DVB-T (Digital Video Terrestrial Broadcasting-Terrestrial) digital video terrestrial broadcasting standa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/32H04N7/015
Inventor 杨林杨知行
Owner TSINGHUA UNIV