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Anti-noise framing modulation method for multimedia broadcasting mobile signal

A multimedia broadcasting and mobile signal technology, applied in multi-frequency code system, shaping network in transmitter/receiver, digital transmission system, etc., can solve problems such as mutual interference, system performance deterioration, signal distortion, etc.

Inactive Publication Date: 2011-12-14
张龙
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  • Description
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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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  • Anti-noise framing modulation method for multimedia broadcasting mobile signal
  • Anti-noise framing modulation method for multimedia broadcasting mobile signal
  • Anti-noise framing modulation method for multimedia broadcasting mobile signal

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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 the embodiment of a certain transmitter of the multimedia broadcasting mobile signal anti-noise framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:

[0035] 1) The anti-noise transmitter of a certain multimedia broadcasting mobile signal forms an FFT coded data block in the frequency domain after its input data bit stream undergoes LDPC coding, symbol modulation and symbol rotation, and 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 the symbol modulation adopts Gray code mapping; the symbol rotation is realized by rotating the symbol constellation at a certain angle, and the code of QPSK The rotation angle of the symbol constellation diagram is 22.5 degrees, the rotation...

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Abstract

The invention discloses a multimedia broadcast mobile signal anti-noise framing modulation method, and belongs to a time domain and frequency domain mixed framing modulation scheme. The multimedia broadcast mobile signal anti-noise framing modulation method has the advantages of low peak-to-average power ratio, short synchronous time, noise resistance, controllable multi-service and the like.

Description

technical field [0001] The invention belongs to the field of mobile communication, and more specifically relates to an anti-noise framing modulation method for multimedia broadcasting mobile signals. Background technique [0002] At present, television broadcasting has gradually developed from analog to digital. Digital TV multimedia broadcasting mobile 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, multimedia broadcasting, mobile-related technologies and related industries are industries with rapid development and good market prospects in the field of communications and computers. In terms of digital TV multimedia broadcasting and mobile-related technologies, countries are currently focusing on how to provide low-cost, reliable and high-speed mobile implementation solutio...

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 张龙
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