Synchronous multicarrier spread spectrum surface digital TV transmission system

A terrestrial digital TV, digital TV technology, applied in the direction of high-definition TV system, etc., can solve problems such as fading

Inactive Publication Date: 2003-04-02
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using Continuous Pilot Technology to Solve Doppler Frequency Shift Tracking and Motion (Time-Space) Fading in High Speed ​​Movement

Method used

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  • Synchronous multicarrier spread spectrum surface digital TV transmission system
  • Synchronous multicarrier spread spectrum surface digital TV transmission system
  • Synchronous multicarrier spread spectrum surface digital TV transmission system

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Embodiment Construction

[0051] The principle and characteristics of the present invention will be described in detail below from four aspects of the innovative technology adopted in the present invention in conjunction with the accompanying drawings. 1. 4K multi-carrier (Multi-Carrier) technology with optimized parameters

[0052] Such as figure 1 As shown, the TS multiplexed stream from the source encoder and multiplexer is adjusted by the code stream delay in Part C, and then enters the frequency domain multi-carrier processing part of Part A, and then passes through energy diffusion, outer encoder, outer Interleaver, inner coder, inner interleaver, mapping modulator, frame adaptation, OFDM, guard interval insertion / time insertion, D / A, channel filtering, front end, thereby forming radio frequency signals and transmitting them. Its technical characteristics are described as follows:

[0053] (1) The multi-carrier modulation COFDM scheme uses 4K mode as the transmission mode, and is mainly aimed a...

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Abstract

A synchronized multi-carrier spread spectrum surface digital TV transmission system includes multi-carrier, time-frequency parallel spread spectrum, periodical continuing pilot frequency and second precisive synchronizing of transmission flow. It elimiantes multi-path effect, establishes SFN system, solves the problems such as difficult to reenter / resynchronize; Doppler FS tracking and movement attenuation; and establishing cellular SFN transmission system.

Description

Technical field: [0001] The invention belongs to the field of digital TV terrestrial transmission, in particular to a digital TV terrestrial transmission system using synchronous multi-carrier spread spectrum and a synchronous cellular single-frequency network system formed therefrom. Background technique: [0002] The digital transmission technology of TV signal, the digital transmission method in channels such as satellite and cable TV have been solved. In terms of its most important terrestrial wireless transmission, its transmission quality, reliability and coverage are affected and limited by the following factors: interference from multipath (urban buildings, hills, mountainous) transmission; ground propagation is blocked by terrain, High-rise shelter and the influence of sea reflection; interference by analog / digital co-channel and adjacent channel; interference by ground burst pulse noise, especially in the ultra-high frequency (VHF) band; when mobile reception, Sev...

Claims

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Application Information

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IPC IPC(8): H04N7/015
Inventor 朱维乐
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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