A Coarse Synchronization Method Based on Multi-segment Repeated Preamble Sequences for Smooth Autocorrelation Timing
A preamble sequence and coarse synchronization technology, applied in the direction of synchronization device, multi-frequency code system, digital transmission system, etc., to achieve the effect of improving the equivalent signal-to-noise ratio
Active Publication Date: 2020-08-18
XI AN JIAOTONG UNIV
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[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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[0021] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The present invention aims at the existing coarse timing synchronization method which is mainly suitable for higher signal-to-noise ratio and cannot effectively solve the problem of frequency selective fading caused by multipath transmission under low signal-to-noise ratio. For the timing synchronization problem, a smooth autocorrelation timing coarse synchronization method based on multiple repeated preamble sequences is proposed. The specific steps are as follows:
[0022] For the timing coarse synchronization detection model used in the present invention, see figure 1 , At the transmitting end, the number of repetitive preamble sequences used for timing coarse synchronization is N, the number of points in each sequence is L, the total length of the preamble is NL, and the number of receiving antennas is M. Sampling at the receiving end, the digital...
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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 coarse timing synchronization method in a non-line-of-sight wireless communication scenario. Background technique [0002] In the process of non-line-of-sight wireless communication, the wireless signal transmission power loss is serious, resulting in a decrease in the received signal-to-noise ratio. On the other hand, multipath transmission can cause severe frequency selective fading, which brings difficulties to the reliable transmission of information. For broadband wireless digital communication, the first thing that needs 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. ...
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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