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burst OFDM timing synchronization method of a conjugate training sequence

A training sequence and timing synchronization technology, which is applied in digital transmission systems, electrical components, modulated carrier systems, etc., can solve problems affecting data demodulation, system performance degradation, timing estimation position deviation, etc., and achieve the effect of improving estimation performance

Inactive Publication Date: 2018-12-21
XIDIAN UNIV
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Problems solved by technology

The timing performance of this method is high, and the integer frequency offset estimation can be completed in the time domain, which reduces the complexity of the synchronization process, but the disadvantage is that when there is a frequency offset in the system and the normalized frequency offset value When the integer part is an odd number, it will cause a deviation in the timing estimation position, which will affect the subsequent data demodulation and cause system performance degradation

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  • burst OFDM timing synchronization method of a conjugate training sequence
  • burst OFDM timing synchronization method of a conjugate training sequence
  • burst OFDM timing synchronization method of a conjugate training sequence

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Embodiment 1

[0043] See figure 1 , figure 1 It is a flowchart of a burst OFDM timing synchronization method based on a conjugate training sequence provided by an embodiment of the present invention. The methods include:

[0044] S1: Receive training sequence;

[0045] First of all, the training sequence is set at the transmitter of the burst OFDM transmission system, which specifically includes the following steps:

[0046] (a) Generate a first training sequence in the time domain, the first training sequence includes lengths N c The two sets of CAZAC sequences c 1 and c 1 *, where N=2N c , N is the length of the first training sequence;

[0047] (b) generating a second training sequence in the time domain, the second training sequence is generated by a CAZAC sequence whose length is N;

[0048] (c) generating a first cyclic prefix at the front end of the first training sequence, and the data in the first cyclic prefix is ​​formed by duplicating data at the end of the first trainin...

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Abstract

The invention relates to a burst OFDM timing synchronization method of a conjugate training sequence, including: receivinga training sequence,constructing a timing metric function according to the training sequence; acquiring a timing position rough estimation error value according to a peak position of the timing metric function;obtainingan accurate estimation error value of the timing deviationaccording to the rough estimation error value of the timing position. The method of the invention sets a training sequence structure at the sending end and constructs a corresponding timing measurement function at the receiving end. When the frequency deviation exists in the system and the normalized frequency deviation value is an odd number, the timing deviation estimation performance of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of digital communication, and in particular relates to a burst OFDM timing synchronization method of a conjugate training sequence. Background technique [0002] In a burst OFDM (Orthogonal Frequency-Division Multiplexing, Orthogonal Frequency Division Multiplexing) wireless communication transmission system, the arrival time of data frames at the receiving end is different, making it difficult for the receiving end to estimate the correct starting position of each frame, resulting in timing estimation. Therefore, in order to ensure correct data demodulation at the receiving end, it is necessary to estimate and compensate the timing deviation. The timing synchronization process of the burst OFDM system can be carried out in two steps: the first step is coarse symbol synchronization, that is, frame synchronization, which detects whether the OFDM frame arrives at the receiving end and determines the approximat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2659H04L27/266H04L27/2675H04L27/2678H04L27/2692H04L27/2695
Inventor 张南杨涛李果宫丰奎
Owner XIDIAN UNIV
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