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Anti-interference high-precision signal synchronization method based on access code in Bluetooth receiver

A signal synchronization and access code technology, which is applied in the direction of network synchronization, multiplexing multi-code, multi-frequency code system, etc., can solve the problems of missed detection and false detection of detection signals, achieve high signal detection accuracy and reduce missed detection or false detection problems, and improve work efficiency

Active Publication Date: 2020-12-29
NANJING QINHENG MICROELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: In order to solve the problem that the detection signal of the Bluetooth receiver is prone to missed detection and false detection in the prior art, the present invention provides an anti-jamming high-precision signal synchronization method based on an access code in a Bluetooth receiver

Method used

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  • Anti-interference high-precision signal synchronization method based on access code in Bluetooth receiver
  • Anti-interference high-precision signal synchronization method based on access code in Bluetooth receiver
  • Anti-interference high-precision signal synchronization method based on access code in Bluetooth receiver

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] An anti-jamming high-precision signal synchronization method based on an access code in a bluetooth receiver, comprising the following steps:

[0042] Step 1: Use the access code agreed by both parties as the local training sequence;

[0043] Step 2: Sampling the received signal, and continuously performing delay differential calculation on two sampling values ​​separated by one symbol period, the delay differential calculation includes phase calculation, and the result of the phase calculation, that is, the phase difference, is used as the sequence to be correlated, and the Sliding correlation operation is performed between the relevant sequence and the local training sequence to find the peak value of the correlation value, and the sampling time corresponding to the peak value is used as the starting position of the access code to realize frame timing synchronization.

[0044] Wherein, the method for obtaining the peak value of the correlation value is as follows: set...

Embodiment 2

[0070] The difference between the second embodiment and the first embodiment is that the phase is not calculated during the delay difference calculation process, and the subsequent correlation calculation is performed directly using the delay difference value.

[0071] when t 0 = T b When , ignoring the influence of noise, the delay difference value is

[0072]

[0073] But at this time the correlation value will be affected by the gain value a 0 impact, because

[0074]

[0075] If I k+m =c m (0≤m≤31), then

[0076]

[0077] Since G(0) is much smaller than 1 / 2, so

[0078]

[0079] Obviously, this correlation value is subject to the gain a 0 Impact. For this, the following energy values ​​need to be calculated

[0080]

[0081] Set the second threshold T h1 E. k , where T h1 is the ratio parameter of the second threshold, when , it is close to the optimal frame timing position. Finds among the sampled values ​​in the subsequent second time length...

Embodiment 3

[0084] Embodiment 3 adds the step of frequency offset estimation on the basis of Embodiment 1 or Embodiment 2, that is, Step 3:

[0085] After realizing frame timing synchronization, the initial position of the access code is determined, and the position of the frame header is determined according to the relationship between the position of the access code and the position of the frame header. Since the frame header is a sequence of 01010101 or 10101010, the waveform of the frame header part is based on a cycle of 2T b recurring. Let the received signal r(t) be in iTb / M The sampling time is r i , delaying the sampling value of the frame header is 2T b Delay differential correlation, and perform summation and angle calculation

[0086]

[0087] in v Indicates the number of symbols involved in frequency offset estimation, and M indicates the oversampling factor.

[0088] From this, an estimate of the frequency offset can be obtained

[0089]

[0090] image 3 The...

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Abstract

The invention discloses an anti-interference high-precision signal synchronization method based on an access code in a Bluetooth receiver. The method comprises the following steps: taking the access code agreed by two parties as a local training sequence; sampling received signals, and continuously performing delay differential operation on the two sampling values at an interval of one code element period, obtaining a to-be-correlated sequence according to a result of the delay differential operation, performing sliding correlation operation on the to-be-correlated sequence and a local training sequence, searching a peak value of a correlation value, and taking a sampling moment corresponding to the peak value as an initial position of an access code, thereby realizing frame timing synchronization. According to the invention, signal synchronization is carried out by using the Bluetooth access code, interference of other signals in the same frequency band is not liable to occur, the signal detection accuracy is high, and the problem of missing detection or false detection is greatly reduced, so that the working efficiency of the Bluetooth receiver is improved, the Bluetooth communication accuracy and safety are ensured, and the communication system is more stable and reliable.

Description

technical field [0001] The invention belongs to the field of bluetooth signal transmission, in particular to an access code-based anti-interference and high-precision signal synchronization method in a bluetooth receiver. Background technique [0002] In the Bluetooth receiver, because the frame header part of its frame structure has strong regularity (for example, the frame header in Bluetooth 4.2 is 01010101 or 10101010), the frame header is usually used for signal detection and symbol synchronization. However, the frequency band where Bluetooth communication is located is an unlicensed frequency band. Communication devices that use this frequency band to communicate include Bluetooth and wifi and many other devices that follow different protocol standards. Therefore, in the process of Bluetooth communication, it is very easy to be seriously affected by many interferences such as co-channel interference and adjacent channel interference. At this time, if the frame header ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J11/00H04J13/00H04L27/26
CPCH04J11/0036H04J13/0077H04J2013/0096H04L27/2656
Inventor 刘德良
Owner NANJING QINHENG MICROELECTRONICS CO LTD
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