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

Multimedia broadcast wireless signal noise-immune framing modulation method

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: 2013-09-25
李德林
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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
  • Multimedia broadcast wireless signal noise-immune framing modulation method
  • Multimedia broadcast wireless signal noise-immune framing modulation method
  • Multimedia broadcast wireless signal noise-immune framing modulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] According to an embodiment of a certain transmitter of the multimedia broadcast wireless signal anti-noise framing modulation method proposed in the present invention, as figure 1 shown, follow these steps:

[0035] 1) This certain multimedia broadcast wireless signal anti-noise transmitter forms the FFT coded data block on the frequency domain through the LDPC code of its input data bit stream, FFT represents fast discrete Fourier transform, and the length of the FFT coded data block is K; The encoding rate of input data for LDPC encoding is one of 1 / 4, 1 / 2, 5 / 8, 3 / 4 and 7 / 8;

[0036] 2) The certain multimedia broadcast wireless signal anti-noise transmitter uses IFFT to transform the FFT coded data block into a time-domain discrete coded data sample block D total , IFFT stands for Inverse Fast Discrete Fourier Transform;

[0037] 3...

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 wireless signal noise-immune framing modulation method which is a time domain frequency domain mixed framing modulation scheme. The multimedia broadcast wireless signal noise-immune framing modulation method has the advantages of a low peak to average power ratio, a short synchronization time, channel noise resistance, controllable multi-service and the like.

Description

technical field [0001] The invention belongs to the field of wireless communication, and more specifically relates to an anti-noise framing modulation method of a multimedia broadcast wireless signal. Background technique [0002] At present, television broadcasting has gradually developed from analog to digital. 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 multimedia broadcasting wireless related technologies and related industries are industries with rapid development and good market prospects in the field of communication and computer. In terms of digital TV multimedia broadcasting wireless related technologies, countries are currently focusing on how to provide low-cost, reliable and high-speed mobile implementation soluti...

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
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 李德林