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A framing modulation method of mobile multimedia broadcasting signal in single frequency network

A technology for mobile multimedia and broadcast signals, applied in multi-frequency code systems, shaping networks in transmitter/receiver, digital transmission systems, etc. question

Inactive Publication Date: 2011-11-30
杨华
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] 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 destruction of the orthogonality between the sub-channels, resulting in mutual interference and deteriorating system performance

Method used

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  • A framing modulation method of mobile multimedia broadcasting signal in single frequency network
  • A framing modulation method of mobile multimedia broadcasting signal in single frequency network
  • A framing modulation method of mobile multimedia broadcasting signal in 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 mobile multimedia broadcast signal framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:

[0034] 1) The network data manager of the single frequency network forms an FFT data block in the frequency domain through symbol modulation and symbol rotation of the input data bit stream, FFT means fast discrete Fourier transform, and the length of the FFT data block is K; the symbol modulation It is one of QPSK, 16QAM, 64QAM and 256QAM. The symbol constellation mapping method of symbol modulation adopts Gray code mapping; the symbol rotation is realized by rotating the symbol constellation at a certain angle, and the QPSK symbol constellation rotation The angle is 22.5 degrees, the rotation angl...

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Abstract

The invention discloses a method for modulating framing of mobile multimedia broadcast signals of a single-frequency network, and relates to a time domain / frequency domain / air space mixed framing modulating scheme. The method for modulating framing of mobile multimedia broadcast signals of the single-frequency network has the advantages of low peak-to-average power ratio, short synchronization time, resistance to channel fading, controllable multiple services and the like.

Description

technical field [0001] The invention belongs to the field of mobile communication, and more specifically relates to a single frequency network mobile multimedia broadcasting signal framing modulation method. Background technique [0002] Digital TV mobile multimedia broadcasting transmission system, as an important part of digital TV mobile multimedia broadcasting, the development of its related technologies is closely related to people's quality of life, and therefore has received extensive attention from people. Digital TV mobile multimedia broadcasting related technologies and related industries are industries with rapid development and good market prospects in the field of communication and computer. In terms of technologies related to digital TV mobile multimedia broadcasting, countries are currently focusing on how to provide low-cost, reliable and high-speed mobile implementation solutions for digital TV mobile multimedia broadcasting in complex wave transmission envi...

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 杨华
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