Method for framing modulation of anti-noise wireless multimedia broadcast signals of single-frequency network

A multimedia broadcasting and framing modulation technology, applied in multi-frequency code systems, shaping networks in transmitters/receivers, digital transmission systems, etc.

Inactive Publication Date: 2013-09-25
白晓燕
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  • Abstract
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Problems solved by technology

[0014] Aiming at the problem of multi-service digital television single-frequency network anti-noise wireless multimedia broadcasting with high coding data rate controllable, the present invention proposes a single-frequency network anti-noise wireless multimedia broadcasting signal framing modulation method

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  • Method for framing modulation of anti-noise wireless multimedia broadcast signals of single-frequency network
  • Method for framing modulation of anti-noise wireless multimedia broadcast signals of single-frequency network
  • Method for framing modulation of anti-noise wireless multimedia broadcast signals of single-frequency network

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Embodiment Construction

[0032] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] According to the embodiment of the single frequency network transmitter of the single frequency network anti-noise wireless multimedia broadcast signal framing modulation method according to the present invention, such as figure 1 As shown, proceed as follows:

[0034] 1) The network data manager of the single frequency network encodes the input data bit stream through LDPC encoding to form an FFT encoded data block in the frequency domain. FFT stands for fast discrete Fourier transform, and the length of the FFT encoded data block is K;

[0035] 2) The network data manager of the single frequency network uses a space frequency encoder with a code rate of 1 to modulate the FFT encoded data block formed in the frequency domain to each anti-noise wireless multimedia broadcast signal transmitter branch in the single frequency network to form ...

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Abstract

The invention discloses a method for framing modulation of anti-noise wireless multimedia broadcast signals of a single-frequency network, relating to a time domain-frequency domain-spatial domain hybrid framing modulation scheme. The method for the framing modulation of the anti-noise wireless multimedia broadcast signals of the single-frequency network has the advantages of low peak-to-average power ratio, short synchronization time, channel fading resistance, multi-service controllability, and the like.

Description

Technical field [0001] The invention belongs to the field of wireless communication, and more particularly relates to a single frequency network anti-noise wireless multimedia broadcast signal framing modulation method. Background technique [0002] Because OFDM multi-carrier transmission technology has a simple structure, high spectrum utilization, resistance to frequency selectivity and channel time variation, etc., it has attracted everyone’s attention and has received in-depth research and development in Xdsl, broadband mobile communications, broadband wireless local area networks, Widely used in many fields such as digital TV wireless multimedia broadcasting. The high peak-to-average power ratio (PAPR) of OFDM signals places high requirements on the linear range of amplifiers and digital-to-analog converters. If the linear range of the system cannot meet the signal change, it will cause signal distortion and change the signal spectrum. , Resulting in the destruction of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/03H04L1/00
Inventor 郑紫微徐铁峰聂秋华何加铭
Owner 白晓燕
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