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

A technology of multimedia broadcasting and single frequency network, applied in multi-frequency code system, shaping network in transmitter/receiver, digital transmission system, etc.

Inactive Publication Date: 2011-11-23
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] 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 broadcasting signal framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:

[0034] 1) The network data manager of the SFN encodes the input data bit stream in the frequency domain through LDPC to form an FFT coded data block, FFT means fast discrete Fourier transform, and the length of the FFT coded data block is K;

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

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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 specifically relates to a single frequency network anti-noise wireless multimedia broadcasting signal framing modulation method. Background technique [0002] Because OFDM multi-carrier transmission technology has many advantages such as simple structure, high spectrum utilization rate, and anti-frequency selectivity and channel time variation, it has attracted much attention and has been deeply researched and applied in Xdsl, broadband mobile communication, broadband wireless local area network, It is widely used in many fields such as digital TV wireless multimedia broadcasting. The high peak-to-average power ratio (PAPR) of OFDM signals has high requirements on the linear range of amplifiers and digital-to-analog converters. If the linear range of the system cannot meet the signal changes, it will cause signal distortion and signal spectrum changes. , resulting in the destructio...

Claims

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Application Information

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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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