Time frequency combined synchronizing method based on fractional Fourier transform

A technology of fractional Fourier transform and time-frequency combination, applied in the direction of multi-frequency code system, etc., can solve the problems of high system complexity and poor time-frequency synchronization performance, and achieve the effect of reduced system complexity and fast synchronization speed

Inactive Publication Date: 2010-05-12
HARBIN INST OF TECH
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Problems solved by technology

[0003] The present invention aims to solve the problems of poor time-frequency synchronization performance and high system complexity of current time-frequency synchronization methods, thereby proposing a time-frequency joint synchronization method based on fractional Fourier transform

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  • Time frequency combined synchronizing method based on fractional Fourier transform
  • Time frequency combined synchronizing method based on fractional Fourier transform
  • Time frequency combined synchronizing method based on fractional Fourier transform

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specific Embodiment approach 1

[0020] The specific embodiment one, a kind of time-frequency joint synchronization method based on fractional Fourier transform, it is realized by the following steps:

[0021] Step 1, connecting two cutting signals in series as a synchronous signal, and transmitting the synchronous signal at the transmitting end;

[0022] Step 2, the receiving end receives the synchronous signal transmitted in step 1, and performs a fractional Fourier transform of p=αcot(k) / (π / 2) to the synchronous signal to obtain the fractional domain amplitude spectrum of the synchronous signal;

[0023] In the formula: p is the transform order, k is the modulation frequency of the chip signal, and α is the fractional Fourier transform angle;

[0024] Step 3. Detect the two peak positions on the fractional domain amplitude spectrum described in step 2, compare the obtained two peak positions with the known peak positions without time offset and frequency offset, and obtain the offset difference ΔN 1 and Δ...

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Abstract

The invention discloses a time frequency combined synchronizing method based on fractional Fourier transform, relating to synchronization technology in wireless communication, and solving the problems that the existing time frequency synchronizing method has poor time frequency synchronization and high system complexity. The method is realized by the following steps: connecting two chip signals in series as a synchronization signal and emitting the synchronization signal; receiving the synchronization signal by a receiving terminal, carrying out fraction Fourier transform to the synchronization signal, detecting the positions of two peak values of fractional domain amplitude spectrum, calculating difference values with the positions at the peak values of a synchronization signal fractional domain without time deviation or frequency deviation, carrying out calculation to two difference values through a formula so as to obtain the correct time deviation and frequency deviation of the system, thus adjusting time window position of the system and the frequency of a local carrier wave, and realizing time frequency combined synchronization. The method is applicable to the processes of signal transmission in the wireless communication.

Description

technical field [0001] The invention relates to a synchronization technology in wireless communication, in particular to a time-frequency joint synchronization method. Background technique [0002] Synchronization technology is a key technology in the communication system, which directly affects the performance of the communication system. The traditional time synchronization method utilizes the good autocorrelation of the synchronization signal to generate the same synchronization signal at the receiving end as the transmitting end and perform correlation processing with the received synchronization signal, and search for the correlation peak to achieve synchronization. The search method is mainly divided into two types. The serial search method only needs one correlator to search the possible synchronization positions sequentially, which requires a long search time. When the synchronization signal used by the system is long, the synchronization performance will be greatly ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 沙学军唐珣吴少川迟永钢吴宣利白旭高玉龙
Owner HARBIN INST OF TECH
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