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

Timed synchronization method for OFDM-WLAN (orthogonal frequency division multiplexing-wireless local area network) system

An OFDM-WLAN, timing synchronization technology, applied in the field of timing synchronization, can solve problems such as limitation, and achieve the effects of improving accuracy, reducing implementation complexity and resource consumption

Inactive Publication Date: 2013-09-11
SOUTHEAST UNIV
View PDF2 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synchronization scheme based on STF and LTF needs to spend a lot of logic resources, and FPGA resources are limited, so it is necessary to seek low-complexity and efficient and accurate algorithms

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
  • Timed synchronization method for OFDM-WLAN (orthogonal frequency division multiplexing-wireless local area network) system
  • Timed synchronization method for OFDM-WLAN (orthogonal frequency division multiplexing-wireless local area network) system
  • Timed synchronization method for OFDM-WLAN (orthogonal frequency division multiplexing-wireless local area network) system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0065] 1) The burst data signal received by the antenna is roughly synchronized through the delayed autocorrelation algorithm. The specific steps are as follows:

[0066] (1) Pass the received signal through 16 delayers, and correlate and accumulate the signal passing through the 16 delayers with the received signal to obtain C(n)

[0067] C ( n ) = Σ k = 0 15 r ( n + k ) · r * ( n + k + 16 )

[0068] (2) Calculate and accumulate the energy of the output signal of the delayer to obtain P(n)

[0069] P ( n ) = ...

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 provides a timed synchronization method for an OFDM-WLAN system. The method comprises the following steps: 1) utilizing a delayed autocorrelation and length maintaining algorithm to achieve coarse synchronization and obtain the energy of an STF (short training field); 2) utilizing the energy to perform automatic gain control (AGC); 3) utilizing the weak correlation of noise and the strong correlation of the STF to achieve fine synchronization; and 4) combining the coarse synchronization with the fine synchronization to obtain the initial position of a data symbol. The timed synchronization method for the OFDM-WLAN system utilizes the STF and meanwhile skillfully utilizes the randomness of the noise to achieve timed synchronization, thereby greatly reducing the calculation and the hardware implementation complexity of a synchronization algorithm and meanwhile being capable of locating the position of the symbol rapidly and accurately.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a timing synchronization method used in an OFDM-WLAN system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technique widely used in high-speed wireless local area network (WLAN) transmission, such as IEEE802.11a protocol. However, the OFDM system has very high requirements on the synchronization of the receiver, especially the timing synchronization, which is the first and most critical step of the receiver, and inaccurate timing will cause a significant decline in system performance. For the bursty data transmission mode of the OFDM-WLAN system, a preamble sequence is generally used to achieve synchronization. For example, in IEEE802.11a, a short training sequence (STF) is used to realize coarse synchronization and a long training sequence (LTF) to realize fine synchronization. Many lite...

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): H04W56/00H04W84/12
Inventor 俞菲缪小龙林翰杨绿溪
Owner SOUTHEAST UNIV
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