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Method for framing and modulating anti-fading wireless multimedia broadcast signals

A multimedia broadcasting and anti-fading technology, applied in multi-frequency code systems, shaping networks in transmitters/receivers, digital transmission systems, etc., can solve problems such as mutual interference, system performance deterioration, and sub-channel orthogonality destruction

Inactive Publication Date: 2011-11-23
刘晶
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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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  • Method for framing and modulating anti-fading wireless multimedia broadcast signals
  • Method for framing and modulating anti-fading wireless multimedia broadcast signals
  • Method for framing and modulating anti-fading wireless multimedia broadcast signals

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Embodiment Construction

[0033] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] According to an embodiment of a certain transmitter of the anti-fading wireless multimedia broadcasting signal framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:

[0035] 1) The certain anti-fading wireless multimedia broadcasting signal transmitter forms FFT concatenated interleaving code modulation in the frequency domain after its input data bit stream undergoes RS coding, convolutional interleaving, LDPC coding, symbol modulation, and symbol interleaving Data block, FFT means Fast Discrete Fourier Transform, the length of FFT concatenated interleaved coding modulation data block is K; the coding rate of LDPC coding is 1 / 4, 1 / 2, 5 / 8, 3 / 4 and 7 / 8 One; the symbol modulation is one of QPSK, 16QAM, 32QAM and 64QAM, the symbol constellation map mapping method adopts Gray code mapping; the ...

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Abstract

The invention discloses a method for framing and modulating anti-fading wireless multimedia broadcast signals, which is a framing and modulating scheme that time domains and frequency domains are mixed. The method for framing and modulating the anti-fading wireless multimedia broadcast signals disclosed by the invention has the advantages of low peak-to-average power ratio, short synchronization time, anti-fading property, controllable multi-service and the like.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to an anti-fading wireless multimedia broadcasting signal framing modulation method. Background technique [0002] At present, television broadcasting has gradually developed from analog to digital. Digital TV broadcasting transmission system, as an important part of digital TV broadcasting, the development of its related technologies is closely related to people's quality of life, and therefore has received extensive attention from people. The technology related to digital TV broadcasting 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 broadcasting, countries are currently focusing on how to provide low-cost, reliable and high-speed mobile solutions for digital TV broadcasting in a complex wave propagation environment. The framing modulation techn...

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Application Information

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