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Mobile multimedia broadcast signal framing modulation method

A technology for mobile multimedia and broadcast signals, applied in multi-frequency code systems, shaping networks in transmitter/receiver, digital transmission systems, etc., and can solve problems such as mutual interference, system performance deterioration, and sub-channel orthogonality destruction.

Inactive Publication Date: 2013-07-24
刘伟利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Mobile multimedia broadcast signal framing modulation method
  • Mobile multimedia broadcast signal framing modulation method
  • Mobile multimedia broadcast signal framing modulation method

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Embodiment Construction

[0031] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] According to an embodiment of a certain transmitter of the mobile multimedia broadcasting signal framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:

[0033] 1) The certain mobile multimedia broadcasting signal transmitter forms an FFT data block in the frequency domain after its input data bit stream undergoes symbol modulation and symbol rotation. FFT means fast discrete Fourier transform, and the length of the FFT 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 element constellation diagram is 22.5 degrees, the rotation angle of...

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Abstract

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

Description

technical field [0001] The invention belongs to the field of wireless communication, and more specifically relates to a mobile multimedia broadcasting signal framing modulation method. Background technique [0002] At present, television broadcasting has gradually developed from analog to digital. Digital TV mobile multimedia broadcasting 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 mobile multimedia broadcasting related technologies 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 mobile multimedia broadcasting, countries are currently focusing on how to provide low-cost, reliable and high-speed mobile implementation solutions for digital TV mo...

Claims

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Application Information

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