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A single frequency network anti-noise mobile multimedia broadcast 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.

Inactive Publication Date: 2011-11-30
蔡春艳
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Aiming at the problem of multi-service digital television single frequency network anti-noise mobile multimedia broadcasting with high coding data rate controllable, the present invention proposes a single frequency network anti-noise mobile multimedia broadcasting signal framing modulation method

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  • A single frequency network anti-noise mobile multimedia broadcast signal framing modulation method
  • A single frequency network anti-noise mobile multimedia broadcast signal framing modulation method
  • A single frequency network anti-noise mobile multimedia broadcast signal framing modulation method

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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 mobile 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 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. LDPC means low-density parity check, and FFT means fast discrete Fourier transform. Transformation, the length of the FFT coded data block is K; the symbol modulation is one of QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellation mapping method of symbol modulation adopts Gray code mapping; the symbol rotation is through the symbol constellation The rotation angle...

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Abstract

The invention discloses a noise-resistance framing modulation method for mobile multi-media broadcast signals of a single frequency network, which is a time domain, frequency domain and space domain hybrid framing modulation scheme. The method has the advantages of low peak-to-average power ratio, short synchronous time, robustness, controllability in 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 anti-noise mobile 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 resistance to frequency selectivity and channel time variation, it has attracted much attention and has been deeply researched and applied in Xdsl, broadband mobile communication, broadband mobile local area network, It is widely used in many fields such as digital TV, mobile multimedia broadcasting, etc. 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 des...

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 蔡春艳
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