Multimedia broadcasting single frequency network signal framing modulation method

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

Inactive Publication Date: 2013-08-21
王小芹
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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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  • Multimedia broadcasting single frequency network signal framing modulation method
  • Multimedia broadcasting single frequency network signal framing modulation method
  • Multimedia broadcasting single frequency network 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 multimedia broadcasting single frequency network wireless 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 data block on the frequency domain with the input data bit stream, and FFT represents fast discrete Fourier transform, and the length of the FFT data block is K;

[0035] 2) The network data manager of the single frequency network uses a space frequency encoder with a code rate of 1 to modulate the FFT data block formed in the frequency domain to each multimedia broadcast wireless signal transmitter branch in the single frequency network to form space frequency modulation FFT data blocks, and adjust the time synchro...

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Abstract

The invention discloses a multimedia broadcasting single frequency network signal framing modulation method which is a time domain, frequency domain and spatial domain mixed framing modulation scheme. The multimedia broadcasting single frequency network signal framing modulation method provided by the invention has the advantages of low peak average power ratio, short synchronizing time, signal channel fading resistance, capability of controlling multiple services, and the like.

Description

technical field [0001] The invention belongs to the field of wireless communication, and more specifically relates to a method for framing and modulating a wireless signal of a multimedia broadcasting single frequency network. Background technique [0002] Digital TV multimedia broadcasting wireless transmission system, as an important part of digital TV wireless 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 wireless 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 wireless multimedia broadcasting, countries are currently focusing on how to provide low-cost, reliable and high-speed mobile solutions for digital TV wireless multimedia broadcasting in a complex wave p...

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 王小芹
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