Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Synchronization method and device for flexible subcarrier OFDM (Frequency Division Multiplexing) system

A flexible sub- and sub-carrier technology, applied in synchronization devices, multi-frequency code systems, baseband system components, etc., to achieve the effects of low implementation complexity, accurate timing estimation and carrier frequency offset estimation

Active Publication Date: 2011-11-23
STATE GRID INFORMATION & TELECOMM BRANCH +1
View PDF3 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: how to realize a kind of accurate timing estimation, and realize the synchronous method of OFDM system with lower complexity

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
  • Synchronization method and device for flexible subcarrier OFDM (Frequency Division Multiplexing) system
  • Synchronization method and device for flexible subcarrier OFDM (Frequency Division Multiplexing) system
  • Synchronization method and device for flexible subcarrier OFDM (Frequency Division Multiplexing) system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The downsampling factor is 8, and the specific implementation process includes the following steps:

[0087] In step S101, the flexible subcarrier OFDM system transmission signal is generated as follows:

[0088] s ( n ) = 1 N Σ k ∈ Ω S k exp ( j 2 πkn / N ) , 0 ≤ n ≤ N - 1

[0089] Among them, the total number of subcarriers N=1024, the number of effective subcarriers K=128, and the center frequency of the baseband signal is 0. Therefore, the modulated effective subcarrier set Ω={k, 1≤k≤64 or 449≤k≤512}, Other subcarriers are modulated as virtual su...

Embodiment 2

[0107] The downsampling factor is 6, and the specific implementation process includes the following steps:

[0108] In step S101, the flexible subcarrier OFDM system transmission signal is generated as follows:

[0109] s ( n ) = 1 N Σ k ∈ Ω S k exp ( j 2 πkn / N ) , 0 ≤ n ≤ N - 1

[0110] Among them, the total number of subcarriers N=1024, the number of effective subcarriers K=128, and the center frequency of the baseband signal is 0, so the modulated subcarrier set Ω={k, 1≤k≤64 or 449≤k≤512}, other subcarriers Modulate virtual subcarriers. A 128-length c...

Embodiment 3

[0127] The downsampling factor is 4, and the specific implementation process includes the following steps:

[0128] In step S101, the flexible subcarrier OFDM system transmission signal is generated as follows:

[0129] s ( n ) = 1 N Σ k ∈ Ω S k exp ( j 2 πkn / N ) , 0 ≤ n ≤ N - 1

[0130] where the sampling frequency f s =4M, the total number of subcarriers N=1024, the number of effective subcarriers K=128, the center frequency of the baseband signal is 0.125M, so the modulated subcarrier set Ω={k|1≤k≤128}, other subcarriers modulate virtual subcarriers c...

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 synchronization method for a flexible subcarrier OFDM (Frequency Division Multiplexing) system, belonging to the technical field of wireless communication transmission. The synchronization method comprises the following steps: (S1) a transmitting end modulates known sequences to generate a training sequence frame on an efficient subcarrier set selected according to service needs and modulates efficient data to generate a time domain signal frame; (S2) the transmitting end combines the training sequence frame and the time domain signal frame into transmitting signals and transmits the transmitting signals through an antenna or a coupler and the like; (S3) a receiving end carries out down sampling on the received signals and local training sequences; (S4) the receiving end carries out timing estimation by using the down sampled signal; and (S5) the receiving end estimates carrier frequency shift. According to the synchronization method, accurate timing estimation is realized, and the complexity of the method is lower.

Description

technical field [0001] The invention relates to the technical field of wireless communication transmission, in particular to a synchronization method and device for a flexible sub-carrier OFDM system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is one of the multi-carrier modulation methods. Its main idea is to divide the high-speed serial data stream into several groups of low-speed parallel data streams and modulate them in each sub-carrier. Transmission over the channel, so that the signal bandwidth on each sub-channel is smaller than the coherent bandwidth of the channel, which can effectively reduce the impact of frequency selective fading. With the development of wireless communication, the wireless transmission system supporting multi-service transmission has received extensive attention. Flexible subcarrier OFDM technology can flexibly change the center frequency and bandwidth of the system by modulating subcarriers on ...

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 Applications(China)
IPC IPC(8): H04W56/00H04L27/26H04L25/02
Inventor 刘建明赵丙镇王一蓉耿亮袁洲宋健董康辉杨昉
Owner STATE GRID INFORMATION & TELECOMM BRANCH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com