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Wireless multimedia broadcast signal framing modulation method for single frequency network

A technology of multimedia broadcasting and framing modulation, applied in the direction of multi-frequency code system, etc., can solve the problems of sub-channel orthogonality destruction, signal distortion, signal spectrum change, etc.

Inactive Publication Date: 2014-04-30
NINGBO UNIV
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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

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  • Wireless multimedia broadcast signal framing modulation method for single frequency network
  • Wireless multimedia broadcast signal framing modulation method for single frequency network

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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 wireless 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 data block on the frequency domain with the input data bit stream, and the length of the FFT data block is K, and the value of K is an even number;

[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 wireless multimedia broadcasting signal transmitter branch in the single frequency network to form space frequency modulation FFT data blocks, and adjust the time synchronization of...

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Abstract

The invention discloses a wireless multimedia broadcast signal framing modulation method for a single frequency network. The method is a spatial domain, time domain and frequency domain combined framing modulation scheme. According to the method, based on training sequence optimization design, signal generation mode selection and signal selection, original signals of OFDM signals can be easily obtained on a receiver side through processing and recovery. The method has the advantages of low peak-to-average power ratio, short synchronization time, anti-channel-fading performance, multi-service controllability and the like.

Description

technical field [0001] The invention belongs to the field of wireless communication, and more specifically relates to a single frequency network wireless multimedia broadcasting signal framing modulation method. Background technique [0002] At present, television broadcasting has gradually developed from analog to digital. Digital TV wireless multimedia broadcasting 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 solutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 郑紫微刘哲何晨晖熊欧吴明昊潘洋
Owner NINGBO UNIV
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