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A framing modulation method for anti-noise mobile signal in multimedia broadcasting single frequency network

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

Inactive Publication Date: 2011-11-30
戴慧敏
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Problems solved by technology

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

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  • A framing modulation method for anti-noise mobile signal in multimedia broadcasting single frequency network
  • A framing modulation method for anti-noise mobile signal in multimedia broadcasting single frequency network
  • A framing modulation method for anti-noise mobile signal in multimedia broadcasting single frequency network

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Embodiment Construction

[0029] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] According to the embodiment of the single frequency network transmitter of the multimedia broadcasting single frequency network anti-noise mobile signal framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:

[0031] 1) The network data manager of the single frequency network forms an FFT encoded data block in the frequency domain after the input data bit stream undergoes LDPC encoding, symbol modulation and symbol rotation, and the length of the FFT encoded data block is K; the symbol modulation 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 by a certain angle, and the QPSK symbol constellation rotation angle The rotation angle of the symbol c...

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Abstract

The invention discloses a method for modulating framing of anti-noise mobile signals of a multimedia broadcast single-frequency network, and relates to a time domain / frequency domain / air space mixed framing modulating scheme. The method for modulating framing of anti-noise mobile signals of the multimedia broadcast single-frequency network has the advantages of low peak-to-average power ratio, short synchronization time, resistance to channel noise, 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 framing modulation method for anti-noise mobile signals of a multimedia broadcasting single frequency network. Background technique [0002] The framing modulation technology of multimedia broadcasting anti-noise mobile signal transmitter is the key technology of digital TV mobile multimedia broadcasting system, which plays a decisive role in the performance of the whole system and is the object of everyone's key research. Orthogonal Frequency Division Multiplexing (OFDM) multi-carrier transmission technology has many advantages such as simple structure, high spectrum utilization, and resistance to frequency selectivity and channel time variation, so it has attracted everyone's attention and has been deeply researched and used in Xdsl, Broadband mobile communication, broadband mobile local area network, digital TV mobile multimedia broadcasting and many other...

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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 戴慧敏
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