Unlock instant, AI-driven research and patent intelligence for your innovation.

Anti-fading framing modulation method for multimedia broadcasting mobile signal

A technology for multimedia broadcasting and mobile signals, applied in multi-frequency code systems, shaping networks in transmitters/receivers, digital transmission systems, etc. question

Inactive Publication Date: 2011-12-14
张丽
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Anti-fading framing modulation method for multimedia broadcasting mobile signal
  • Anti-fading framing modulation method for multimedia broadcasting mobile signal
  • Anti-fading framing modulation method for multimedia broadcasting mobile signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] According to an embodiment of a certain transmitter of the multimedia broadcasting mobile signal anti-fading framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:

[0034] 1) The anti-fading transmitter of a certain multimedia broadcast mobile signal passes its input data bit stream through RS coding (Reed-Solomon, RS), convolutional interleaving, LDPC coding (Low Density Parity Check, LDPC), symbol modulation and After symbol rotation and symbol interleaving, an FFT concatenated interleaved coded modulation data block is formed in the frequency domain. FFT means fast discrete Fourier transform, and the length of the FFT concatenated interleaved coded modulated data block is K; the coding rate of LDPC code is 1 / One of 4, 1 / 2, 5 / 8, 3 / 4, and 7 / 8; the symbol modulation is one of QPSK, 16QAM, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a multimedia broadcast mobile signal anti-fading framing modulation method and in particular relates to a framing modulation scheme with mixing of time domains and frequency domains. The multimedia broadcast mobile signal anti-fading framing modulation method has the advantages that the peak-average power ratio is low, the synchronization time is short, the fading resistance is achieved, and the multiple services can be controlled and the like.

Description

technical field [0001] The invention belongs to the field of mobile communication, and more specifically relates to an anti-fading framing modulation method for multimedia broadcasting mobile signals. Background technique [0002] Digital TV, multimedia broadcasting, mobile-related technology and related industries are industries with rapid development and good market prospects in the field of communication and computer. Multimedia broadcasting mobile signal anti-fading transmitter framing modulation technology is the key technology of digital TV multimedia broadcasting mobile system, which plays a decisive role in the performance of the whole system and is the object of everyone's key research. Due to the rapid development of digital signal processing technology and integrated circuit technology, the system realization of Orthogonal Frequency Division Multiplexing (OFDM) technology becomes easier and easier. Because OFDM multi-carrier transmission technology has many advan...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04L27/26H04L25/03H04L1/00
Inventor 郑紫微徐铁峰聂秋华何加铭
Owner 张丽