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Coarse timing synchronization method based on multiple repetitive preamble sequences

A preamble sequence and coarse synchronization technology, applied in the direction of synchronization device, multi-frequency code system, radio transmission system, etc., to achieve the effect of improving the equivalent signal-to-noise ratio

Active Publication Date: 2017-11-17
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the timing synchronization problem of the broadband wireless communication system in the low signal-to-noise ratio multi-path transmission environment, and propose a smooth autocorrelation timing rough synchronization method based on multi-segment repeated preamble sequences

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  • Coarse timing synchronization method based on multiple repetitive preamble sequences
  • Coarse timing synchronization method based on multiple repetitive preamble sequences
  • Coarse timing synchronization method based on multiple repetitive preamble sequences

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The present invention is mainly suitable for higher signal-to-noise ratios for existing timing coarse synchronization methods, and cannot effectively solve the problem of frequency selective fading caused by multi-path transmission under low signal-to-noise ratios. For the timing synchronization problem, a smooth autocorrelation timing coarse synchronization method based on multi-segment repeated preamble sequences is proposed. The specific steps are as follows:

[0022] The timing coarse synchronization detection model used in the present invention can be found in figure 1 , at the transmitting end, the number of repeated segments of the preamble sequence used for timing coarse synchronization is N, the number of points in each sequence is L, the total length of the preamble sequence is NL, and the number of receiving antennas is M. Sampling is...

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Abstract

The invention discloses a coarse timing synchronization method based on multiple repetitive preamble sequences. The method comprises the steps of: transmitting a preamble sequence with repetitive characteristics, receiving the preamble sequence by a plurality of antennas at a receiving end, and performing smoothing and autocorrelation on the multiple received signals to configure a timing measurement variable [lambda](d) by . When the value of the timing measurement variable is greater than a set detection threshold, it is considered that a timing coarse synchronization point is reached. The method can realize coarse timing synchronization under a low signal-to-noise ratio. An optimal detection threshold value can be preset according to Monte Carlo simulation results under different system parameters so that the probability of coarse synchronization error is greatly reduced.

Description

technical field [0001] The invention relates to a broadband wireless communication system under a multipath channel, in particular to a timing rough synchronization method under a non-line-of-sight wireless communication scene. Background technique [0002] In the process of non-line-of-sight wireless communication, the power loss of wireless signal transmission seriously leads to the reduction of received signal-to-noise ratio. On the other hand, multipath transmission will cause serious frequency selective fading, which brings difficulties to the reliable transmission of information. For broadband wireless digital communication, the first thing to be solved is the timing synchronization problem of the received signal. [0003] In the past research, the research on timing synchronization mainly focused on the condition of high signal-to-noise ratio, which can be divided into non-data-assisted synchronization algorithms and data-assisted synchronization algorithms. In data...

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Application Information

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IPC IPC(8): H04W56/00H04L27/26H04B7/0413
CPCH04B7/0413H04L27/2663H04W56/001
Inventor 穆鹏程陈健成张渭乐王文杰孟繁宁张建国
Owner XI AN JIAOTONG UNIV