Single-frequency-network robust wireless multimedia broadcast signal framing and modulating method

A technology of multimedia broadcasting and framing modulation, applied in multi-frequency code system, shaping network in transmitter/receiver, digital transmission system, etc., can solve problems such as system performance deterioration, signal spectrum change, mutual interference, etc.

Inactive Publication Date: 2014-05-14
NINGBO UNIV
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Problems solved by technology

[0004] The high peak-to-average power ratio (PARR) 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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  • Single-frequency-network robust wireless multimedia broadcast signal framing and modulating method
  • Single-frequency-network robust wireless multimedia broadcast signal framing and modulating 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 single frequency network robust 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 concatenated interleaved coded modulation data block in the frequency domain after the input data bit stream undergoes BCH coding, bit interleaving, LDPC coding, symbol modulation, and symbol interleaving. FFT means fast Discrete Fourier transform, FFT cascaded interleaving encoding, the length of the modulation data block is K; the encoding rate of LDPC encoding is one of 1 / 4, 1 / 2, 5 / 8, 3 / 4 and 7 / 8; the bit interleaving adopts random Interleaving method; symbol modulation is one of QPSK, 16QAM, 32QAM, 64QAM,...

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Abstract

The invention discloses a single-frequency-network robust wireless multimedia broadcast signal framing and modulating method which is a framing and modulating scheme where the space domain, the time domain and the frequency domain are mixed. Original signals of OFDM signals can be easily obtained by conducting processing and recovering at the receiver end through the training sequence optimizing design, the signal generation mode and the signal selection method of the single-frequency-network robust wireless multimedia broadcast signal framing and modulating method. The single-frequency-network robust wireless multimedia broadcast signal framing and modulating method has the advantages of being low in peak-to-average power ratio, short in synchronization time, capable of resisting channel fading, capable 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 single frequency network robust 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03H04L1/00
Inventor 郑紫微刘哲何晨晖熊欧吴明昊潘洋
Owner NINGBO UNIV
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