Method and device for detecting preamble signal

A technology for a preamble signal and a signal to be detected, applied in the field of communication, can solve the problems of low detection accuracy of the preamble signal, and achieve the effects of improving the accuracy and reducing the missed detection rate and false detection rate.

Active Publication Date: 2020-02-25
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the low detection accuracy of the preamble signal caused by the Doppler frequency offset in a high-speed mobile environment, the embodiment of the present invention provides a method and device for detecting the preamble signal

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  • Method and device for detecting preamble signal
  • Method and device for detecting preamble signal
  • Method and device for detecting preamble signal

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Embodiment Construction

[0051] In order to make the object, technical solution and beneficial effects of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0052] For the convenience of understanding, the terms involved in the embodiments of the present invention are explained below.

[0053] NB-IoT: An important branch of the Internet of Everything. NB-IoT is built on a cellular network and only consumes about 180KHz of bandwidth. It can be directly deployed on a GSM network, UMTS network or LTE network to reduce deployment costs and achieve smooth upgrades.

[0054] Frequency hopping: The carrier frequency hops according to a certain pattern (sequence) within a wide frequency range.

[0055] Missing detection rate: The probability that ...

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Abstract

The embodiment of the invention provides a method and device for detecting a preamble signal in the technical field of communications. The method comprises the following steps: demodulating a receivedto-be-detected signal, determining a channel estimation value of each symbol group in the to-be-detected signal according to a preset frequency hopping characteristic of the preamble signal, determining effective power of the to-be-detected signal and a power correction value of the to-be-detected signal according to the frequency hopping characteristic and the channel estimation value of each symbol group in the to-be-detected signal; correcting the effective power of the to-be-detected signal by adopting the power correction value of the to-be-detected signal, determining the correction power of the to-be-detected signal, and finally determining whether the to-be-detected signal is a leader signal according to the correction power of the to-be-detected signal. The power correction valueis determined by combining the influence of the frequency offset on the effective power, and then the effective power is corrected by adopting the power correction value, so that the influence of thefrequency offset can be effectively reduced when the correction power is adopted to judge whether the to-be-detected signal is the preamble signal or not, and the omission ratio and the false detection rate of the preamble signal are reduced.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a method and device for detecting a preamble signal. Background technique [0002] Similar to the Long Term Evolution (LTE) system, the purpose of random access in the Narrowband Internet of Things (NB-IoT) system is to establish uplink between the User Equipment (UE) and the base station. Synchronization relationship and request for allocation of dedicated resources for uplink transmission. When establishing an uplink synchronization relationship, the UE first sends a preamble signal to the base station, and the base station establishes synchronization with the UE after receiving the preamble signal. However, in the mobile environment, there is Doppler frequency offset, which leads to signal dispersion. When the traditional synchronization detection algorithm detects the preamble signal, it does not consider the influence of the frequency offset on the preamble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/318H04B17/336H04L5/00H04L25/02
CPCH04L5/0007H04L5/0048H04L25/0202H04B17/318H04B17/336
Inventor 刘吉凤
Owner DATANG MOBILE COMM EQUIP CO LTD
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