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Anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network

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

Inactive Publication Date: 2011-11-23
广德睿纳鲜果酒业有限公司
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Problems solved by technology

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 wireless signal framing modulation method of multimedia broadcasting single frequency network
  • Anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network
  • Anti-noise wireless signal framing modulation method of multimedia broadcasting single frequency network

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Embodiment Construction

[0029] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] According to the embodiment of the single frequency network transmitter of the multimedia broadcasting single frequency network anti-noise wireless signal framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:

[0031] 1) The network data manager of the SFN encodes the input data bit stream in the frequency domain through LDPC encoding to form an FFT encoded data block, FFT means fast discrete Fourier transform, and the length of the FFT encoded data block is K; LDPC encoding is performed on the input data The coding rate is one of 1 / 4, 1 / 2, 5 / 8, 3 / 4 and 7 / 8;

[0032] 2) The network data manager of the SFN uses a space-frequency coder with a code rate of 1 to modulate the FFT coded data blocks formed in the frequency domain to the branches of each multimedia broadcast anti-noise wireless sig...

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Abstract

The invention discloses an anti-noise wireless signal framing modulation method of a multimedia broadcasting single frequency network, relating to a framing modulation scheme with mixture of time domain, frequency domain and space domain. The anti-noise wireless signal framing modulation method of the multimedia broadcasting single frequency network in the invention has the advantages of low peak-to-average power ratio, short synchronization time, noise resistance, controllability of a plurality of 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 anti-noise wireless signals of a multimedia broadcasting single frequency network. Background technique [0002] The framing modulation technology of multimedia broadcasting anti-noise wireless signal transmitter is the key technology of digital TV wireless multimedia broadcasting system. Orthogonal Frequency Division Multiplexing (OFDM) multi-carrier transmission technology has many advantages such as simple structure, high spectrum utilization, and resistance to frequency selectivity and channel time variation, so it has attracted everyone's attention and has been deeply researched and used in Xdsl, Broadband mobile communication, broadband wireless local area network, digital TV wireless multimedia broadcasting and many other fields are widely used. The high peak-to-average power ratio (PAPR) of OFDM signals has high re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/26H04L25/03
Inventor 郑紫微徐铁峰聂秋华何加铭
Owner 广德睿纳鲜果酒业有限公司
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