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Multimedia broadcast mobile signal framing modulation method

A technology for multimedia broadcasting and mobile signals. It is used in multi-frequency code systems, shaping networks in transmitters/receivers, and baseband system components. It can solve problems such as system performance deterioration, signal spectrum changes, and mutual interference.

Inactive Publication Date: 2013-08-21
陈春艳
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  • 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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  • Multimedia broadcast mobile signal framing modulation method
  • Multimedia broadcast mobile 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 multimedia broadcasting mobile signal framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:

[0033] 1) The certain multimedia broadcast mobile signal transmitter forms an FFT data block in the frequency domain through symbol modulation and symbol rotation of its own input data bit stream, FFT represents 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. The symbol constellation mapping method of symbol modulation adopts Gray code mapping; the symbol rotation is realized by rotating the symbol constellation at a certain angle. The QPSK symbol The rotation angle of the constellation diagram is 22.5 degrees, the rotation angle of the symbol constel...

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Abstract

The invention discloses a multimedia broadcast mobile signal framing modulation method, and belongs to a time domain and frequency domain mixed framing modulation scheme. The multimedia broadcast mobile 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 mobile communication, and more specifically relates to a method for framing modulation of 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 solutions for di...

Claims

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Application Information

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