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

United integer frequency offset estimation method and device through utilization of an inter-multi-symbol pilots

A technique of integer frequency offset estimation and integer frequency offset, which can be used in multi-frequency code systems, digital transmission systems, electrical components, etc., and can solve problems such as inter-subcarrier interference.

Active Publication Date: 2017-12-01
西安宇飞电子技术有限公司
View PDF5 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for multi-carrier systems, it will cause inter-subcarrier interference (ICI), so OFDM systems are more sensitive to carrier offset than single-carrier systems, and measures must be taken to eliminate frequency offset

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
  • United integer frequency offset estimation method and device through utilization of an inter-multi-symbol pilots
  • United integer frequency offset estimation method and device through utilization of an inter-multi-symbol pilots
  • United integer frequency offset estimation method and device through utilization of an inter-multi-symbol pilots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0069] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be constrained by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure, and to fully convey the scope of the present disclosure to those skilled in the art.

[0070] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "the" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or mo...

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 a united integer frequency offset estimation method and device through utilization of an inter-multi-symbol pilot. The method comprises the following steps of finishing synchronization by a system, thereby determining a position of a cyclic prefix CP of each OFDM (Orthogonal Frequency Division Multiplexing) symbol; calculating decimal frequency offset through the cyclic prefixes in a time domain and correcting the decimal frequency offset in a receiving signal; in a frequency domain, carrying out conjugate multiplication on local pilot subcarriers and receiving subcarriers at different initial positions, thereby obtaining sequence signals, carrying out self-correlation conjugate multiplication on the adjacent sequence signals, thereby obtaining self-correlation sequences, and carrying out summation on the self-correlation sequences, thereby obtaining maximum likelihood self-correlation values; determining an initial position of a pilot index according to the maximum likelihood self-correlation values of multiple symbols; and subtracting the initial position of the pilot index from a receiving end pilot position to obtain the integer frequency offset, and extracting all subcarrier information according to an integer frequency offset value and direction in the frequency domain. According to the method and the device, the integer frequency offset estimation is carried out through unity of the inter-multi-symbol and maximum likelihood conjugate correlation, so the accuracy is greatly improved.

Description

technical field [0001] The present invention relates to the field of multi-carrier systems of OFDM systems, in particular to a method and device for joint integer frequency offset estimation using multi-symbol pilots. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) is Orthogonal Frequency Division Multiplexing technology. In fact, OFDM is MCM (Multi Carrier Modulation), a type of multi-carrier modulation. The basic principle of OFDM is to decompose a high-speed data stream into N parallel low-speed data streams, and transmit them simultaneously on N subcarriers. These data symbols transmitted simultaneously on N subcarriers constitute an OFDM symbol, such as figure 1 shown. OFDM symbols can be generated using either time-domain or frequency-domain methods. Wherein, the OFDM symbol generation method in the time domain is also called the Conceptual OFDM symbol generation method, and the Conceptual OFDM symbol generation method is as follows ...

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): H04L27/00H04L27/26
CPCH04L27/0014H04L27/2601H04L27/2611H04L2027/0026
Inventor 熊军
Owner 西安宇飞电子技术有限公司
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