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Signal synchronization method and device

A technology for signal synchronization and position synchronization, which is applied in the field of communication, and can solve problems such as inapplicability, inability to support signal-to-noise ratio, low signal synchronization, etc.

Active Publication Date: 2019-03-26
DATANG LINKTESTER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The above-mentioned existing technologies cannot be applied to the non-signaling test of narrowband Internet of Things (NB-IOT) single-carrier signals, and cannot support signal synchronization with a relatively low signal-to-noise ratio

Method used

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  • Signal synchronization method and device

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Embodiment Construction

[0069] Embodiments of the present application provide a signal synchronization method and device for accurately and quickly determining a signal synchronization position.

[0070] The embodiment of this application is mainly aimed at the NB-IOT single-carrier signal synchronization system. In the non-signaling test, since the single-carrier subcarrier offset is unknown, there will be a large frequency offset in the received signal. In order to accurately and quickly find the synchronization position, according to When the NB-IOT single-carrier baseband signal is generated, there will be a phase rotation of π(pi) / 2 or pi / 4 between symbols. Using phase rotation, the peak value and position of the phase difference between symbols can be found, and then the signal synchronization position can be accurately found. for subsequent demodulation and measurement.

[0071] Considering that the non-signaling test in the prior art is unknown to the subcarrier offset position, the received ...

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Abstract

The present application discloses a signal synchronization method and a device for accurately and quickly determining a signal synchronization position. The signal synchronization method provided by embodiments of the present application comprises the following steps of: detecting the power of a received signal; determining the received signal after the power detection; eliminating frequency offset of the received signal after the power detection; and determining the synchronization position of the signal after the frequency offset is eliminated.

Description

technical field [0001] The present application relates to the field of communication technologies, and in particular to a signal synchronization method and device. Background technique [0002] For Orthogonal Frequency Division Multiplexing (OFDM) systems, traditional synchronization is mainly timing synchronization, using signaling interaction for time offset correction or using cyclic prefix (CyclicPrefix, CP) for simple coarse synchronization, the first One is mainly a signaling mode, and the second is suitable for multi-carrier systems, and the synchronization range is limited. [0003] The above prior art cannot be applied to the non-signaling test of a narrowband Internet of Things (NB-IOT) single-carrier signal, and cannot support signal synchronization with a relatively low signal-to-noise ratio. Contents of the invention [0004] Embodiments of the present application provide a signal synchronization method and device for accurately and quickly determining a sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026
Inventor 李明汤威祖晓伏
Owner DATANG LINKTESTER TECH
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