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

Time offset estimation method and device for OFDM system, storage medium and terminal

A time offset estimation and system timing technology, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve the problems of high complexity, limited timing offset range, poor anti-noise ability, etc., and reduce the clock accuracy. requirements, the effect of shortening the processing time

Active Publication Date: 2019-07-05
SPREADTRUM COMM (SHANGHAI) CO LTD
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing timing offset estimation techniques mainly include two types: one is based on OFDM cyclic prefix for blind detection and blind estimation, and its disadvantage is that the detected timing offset range is limited; the other is based on Long Term Evaluation (Long Term Evaluation, referred to as Complete timing offset estimation for the training sequence of primary synchronization signal and secondary synchronization signal in LTE) OFDM system, with high complexity and poor noise immunity

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
  • Time offset estimation method and device for OFDM system, storage medium and terminal
  • Time offset estimation method and device for OFDM system, storage medium and terminal
  • Time offset estimation method and device for OFDM system, storage medium and terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] Those skilled in the art understand that, as mentioned in the background, the existing time offset estimation technology either has a small timing offset range, or has a high complexity of the time offset estimation algorithm and poor noise immunity.

[0030] An embodiment of the present invention provides a method for estimating time offset of an OFDM system. The method for estimating time offset of an OFDM system includes: taking the timing of the OFDM system as a reference, advancing N·T int The duration starts to receive data, and the total receiving duration is 1 subframe plus 2N·T int data to get the received data, where, T int is the preset unit offset duration, and N is the maximum number of supported preset unit offset durations; the data with a length of 1 subframe is taken out from the received data, and the minimum is calculated based on the data with a length of 1 subframe T f ; to T int Traverse the received data for the step size, take out data with a ...

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 time offset estimation method and device of an OFDM system, a storage medium and a terminal. The time offset estimation method comprises the steps that data are received in advance by taking OFDM system timing as a reference, the total receiving time length is data obtained by adding 2N*Tnt to one subframe, the Tnt is the preset unit offset time length, and N is the maximum number of supported preset unit offset time lengths; data with the length of one subframe is taken out from the received data, and decimal times of time offset Tf are calculated based on the data;the received data is traversed by taking the Tint as a step length, data of one sub-frame each time is taken out and CFI; a judgment is determined the offset number n according to the CFI obtained inthe traversal process, wherein n is an integer and N (n(N; total offset deviation Delta is calculated as T, wherein Delat T= n*Tint+Tf. According to the scheme of the invention, time offset estimationwith low complexity and high reliability can be realized, and the timing synchronization requirement of the OFDM system is met.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a time offset estimation method and device, a storage medium, and a terminal of an OFDM system. Background technique [0002] Orthogonal Frequency Divided Multiplexing (OFDM) technology has high spectrum efficiency and excellent anti-intersymbol interference performance. It is very suitable for broadband high-speed communication scenarios and is widely used in wireless mobile communication systems. [0003] OFDM technology divides the channel into multiple parallel and orthogonal sub-carriers to transmit data. Timing synchronization is a key issue that affects the accuracy of OFDM channel transmission and is one of the important factors that determine the performance of OFDM systems. Since a large time offset may lead to inter-symbol interference and even destroy the orthogonality of subcarriers, a low-complexity, high-reliability timing offset (also instan...

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
CPCH04L27/2656
Inventor 申建平赵况平张家辉柳柏明
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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