An OFDM system fast access searching method and device

A search method, a fast technology, applied in the transmission system, multi-frequency code system, digital transmission system, etc., can solve the problems that are not suitable for private network cell search and user access, complex cell search algorithm process, etc., to achieve fast cell The effect of search and user access

Active Publication Date: 2019-05-10
西安宇飞电子技术有限公司
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AI Technical Summary

Problems solved by technology

[0014] The existing cell search algorithm has a complex process and is not suitable for cell search and user access in private networks

Method used

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  • An OFDM system fast access searching method and device
  • An OFDM system fast access searching method and device
  • An OFDM system fast access searching method and device

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Embodiment Construction

[0060] 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 limited 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.

[0061] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" 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 more o...

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Abstract

The invention relates to an OFDM (Orthogonal Frequency Division Multiplexing) system fast access searching method and device, and the method comprises the steps: collecting an OFDM signal, extractinga low-speed OFDM signal, and keeping the high-speed OFDM signal; Performing autocorrelation calculation on the low-speed OFDM signal to obtain an access point fuzzy interval of the OFDM system; Performing frequency offset calculation and frequency offset calibration on the high-speed OFDM signal in the fuzzy interval of the access point; And performing accurate synchronization calculation on the high-speed OFDM signal and the local synchronization signal after frequency offset calibration so as to obtain the access point of the OFDM system. According to the invention, coarse synchronization iscarried out by using low-speed OFDM signal autocorrelation; The method comprises the following steps: obtaining an access point fuzzy interval by using a local synchronization signal, performing frequency offset calculation and correction on a high-speed OFDM signal in the access point fuzzy interval, and finally performing cross-correlation by using the high-speed OFDM signal and the local synchronization signal to obtain an accurate access point, thereby solving the problems of fast cell search and user access of a private network.

Description

technical field [0001] The present invention relates to the field of cell search and terminal access technologies, and in particular to a fast access search method and a fast access search device for an OFDM system. Background technique [0002] Cell search / terminal access to the network is an important physical layer process, not an independent algorithm, but a set of related key algorithms, such as time synchronization, frequency offset estimation, etc. Cell search process design. [0003] Available physical resources for cell search in existing LTE-TDD (Long Term Evolution-Time Division Duplexing) include downlink synchronization channels SCH such as P-SCH (Primary Synchronization Channel, primary synchronization channel) and S-SCH (Secondary Synchronization Channel, auxiliary synchronization channel), common reference signal and broadcast channel. The relevant information that needs to be obtained during the cell search process is: symbol timing detection. [0004] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/00
Inventor 熊军王云杰刘懿
Owner 西安宇飞电子技术有限公司
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