OFDM (Orthogonal Frequency-Division Multiplexing) training sequence construction method and synchronization method

A training sequence and sequence technology, applied in the field of OFDM training sequence construction and synchronization, can solve the problems of OFDM frequency deviation, high peak-to-average ratio, affecting the performance of OFDM system, etc. Effect

Active Publication Date: 2016-04-20
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
View PDF5 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, OFDM has the problems of being susceptible to frequency deviation and high peak-to-average ratio, which seriously affect the performance of OFDM system

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
  • OFDM (Orthogonal Frequency-Division Multiplexing) training sequence construction method and synchronization method
  • OFDM (Orthogonal Frequency-Division Multiplexing) training sequence construction method and synchronization method
  • OFDM (Orthogonal Frequency-Division Multiplexing) training sequence construction method and synchronization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0031] Embodiments of the present invention relate to an OFDM training sequence construction and synchronization method, such as figure 1 shown, including the following steps:

[0032] (1) Construct a sequence C of length N init =[C 0 ,0,C 2 ,0,...,C 2l ,0,...,C N-2 ,0], where C 2l , l=0,1,...,N / 2-1 is a PN sequence with a value of +1 or -1, and N is the length of an OFDM symbol; for C init Perform IFFT transformation t...

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 relates to an OFDM (Orthogonal Frequency-Division Multiplexing) training sequence construction method and synchronization method, comprising the following steps: a PN (pseudo-noise) sequence is utilized to construct a sequence with a front and back repetition conjugate symmetric structure; weighting treatment is performed on the sequence, and a training sequence with a transmitting terminal used for synchronization is obtained; a receiving terminal defines a timing metric function, and symbol timing synchronization is finished by searching the maximum of the timing metric function; an estimation of fraction frequency offset is obtained by computing a phase difference of two front and back repetition parts of the received training sequence; an estimation of integer frequency offset is finished by utilizing the influence of integer frequency offset on correlated characteristics of a training sequence frequency domain. The OFDM training sequence construction method and synchronization method eliminates the influences of side peaks and peak platforms on synchronization, which are caused by symmetrical structure sequences and cyclic prefixes in a traditional synchronization method, so that the timing synchronization accuracy rate is higher, the estimation of synchronization frequency offset has a smaller error of mean square, and the OFDM training sequence construction method and synchronization method can be effectively used for time and frequency synchronization of an OFDM system in a multipath fading channel.

Description

technical field [0001] The present invention relates to a synchronization method in the technical field of OFDM, in particular to a construction of an OFDM training sequence and a synchronization method. Background technique [0002] Orthogonal Frequency-Division Multiplexing ("OFDM") technology has not only been widely used in the field of broadcast digital audio and video, but also has become a part of the wireless local area network standard and is the key technology of the fourth-generation mobile communication . OFDM is a kind of multi-carrier modulation technology. Its main idea is to divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them on each sub-channel for transmission. The signal bandwidth on each sub-channel is smaller than the correlation bandwidth of the channel, so each sub-channel can be regarded as flat fading, so that inter-symbol interference can be eliminated....

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): H04L27/26
CPCH04L27/266H04L27/2675
Inventor 张力邱云周杨旭光汪涵王康如李凤荣郑春雷
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap