An anti-fading mobile multimedia broadcasting signal framing modulation method

A technology for mobile multimedia and broadcast signals, applied in multi-frequency code systems, shaping networks in transmitters/receivers, digital transmission systems, etc., and can solve problems such as mutual interference, system performance deterioration, and signal distortion.

Inactive Publication Date: 2011-12-07
司长海
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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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  • An anti-fading mobile multimedia broadcasting signal framing modulation method
  • An anti-fading mobile multimedia broadcasting signal framing modulation method
  • An anti-fading mobile multimedia broadcasting signal framing modulation method

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Embodiment Construction

[0034] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0035] According to an embodiment of a certain transmitter of the anti-fading mobile multimedia broadcasting signal framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:

[0036] 1) The certain anti-fading mobile multimedia broadcast signal transmitter forms an FFT level in the frequency domain after its input data bit stream undergoes RS coding, convolutional interleaving, LDPC coding, symbol modulation, symbol rotation, and symbol interleaving Concatenated interleaved coded modulation data block, FFT means fast discrete Fourier transform, the length of FFT concatenated interleaved coded modulated data block is K; LDPC coded code rates are 1 / 4, 1 / 2, 5 / 8, 3 / 4 and 7 One of / 8; the symbol modulation is one of QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellation mapping method adopts Gray code...

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Abstract

The invention discloses an anti-fading mobile multimedia broadcasting signal framing modulation method which is a time domain and frequency domain mixed framing modulation scheme. The anti-fading mobile multimedia broadcasting signal framing modulation method provided by the invention has the advantages of low peak average power rate, short synchronous time, fading resistance, capability of controlling multiple services, and the like.

Description

technical field [0001] The invention belongs to the field of mobile communication, and more specifically relates to an anti-fading mobile multimedia broadcast 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 modulat...

Claims

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Application Information

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