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Time synchronization method and apparatus

A time synchronization device and time synchronization technology, applied in communication between multiple stations, data exchange through path configuration, multi-frequency code system, etc., can solve the problem of inaccurate frame timing synchronization accuracy and improve the platform phenomenon and glitch phenomenon, improve accuracy, and reduce the effect of false alarm probability

Inactive Publication Date: 2009-05-27
HUAWEI TECH CO LTD
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Problems solved by technology

In a multipath environment, in order to obtain the best system performance, it is necessary to obtain the best frame timing synchronization to meet the delay extension requirements of the system, but the accuracy of frame timing synchronization in the prior art is not accurate enough

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  • Time synchronization method and apparatus
  • Time synchronization method and apparatus

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Embodiment Construction

[0028] The technical solutions of the embodiments of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] figure 1 It is a flow chart of the time synchronization method in Embodiment 1 of the present invention, and this embodiment specifically includes:

[0030] Step 11: Perform autocorrelation processing and energy calculation processing on the received signal to obtain a first metric function, which represents the degree of autocorrelation of the received signal.

[0031] Step 12: Accumulate the above-mentioned first metric function to obtain a second metric function;

[0032] Step 13: Perform frame detection and timing synchronization according to the above-mentioned second metric function.

[0033] figure 2 It is a flow chart of the time synchronization method in Embodiment 2 of the present invention, see image 3 The schematic diagram of the time synchronization method in Embodiment 2 o...

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Abstract

The embodiment of the invention relates to a time synchronization method and a time synchronization device. The time synchronization method comprises the following steps: a first metric function which characterizes the autocorrelation degree of a received signal is received according to an autocorrelation function of the received signal; the first metric function is subject to accumulated operation to obtain a second metric function; the frame detection and the timing synchronization are performed according to the second metric function; and the time synchronization device comprises a processing module used for obtaining the first metric function, an accumulation module used for performing accumulated operation on the first metric function to obtain the second metric function, and a frame detection and timing synchronization module used for performing the frame detection and the timing synchronization according to the second metric function. The time synchronization method and the time synchronization device can improve the accuracy of the frame detection and the timing synchronization, and reduce the false-alarm probability of the frame detection.

Description

technical field [0001] Embodiments of the present invention relate to the field of mobile communications, in particular to a time synchronization method and device. Background technique [0002] Wireless access to the Internet and wireless multimedia data services have promoted the rapid development of wireless communication technology, and broadband and mobile communication technologies have become the future development trend. Among them, the Worldwide Interoperability for Microwave Access (WiMAX for short) technology has gradually become the mainstream technology for metro broadband wireless access. WIMAX is a broadband wireless access technology, including the air interface technology between the base station and the user station, and has made detailed regulations on the frame structure and system design parameters of the physical layer. The WiMAX system supports multiple physical layer air interfaces, and the support for the air interface of the Orthogonal Frequency Di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04L27/26H04L12/28
Inventor 林亚
Owner HUAWEI TECH CO LTD
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