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Time-frequency synchronizing method for multi-input and multi-output orthogonal frequency-division multiplexing system

A technology of orthogonal frequency division and time-frequency synchronization, applied in the field of communication, can solve the problems of reducing the amount of calculation, complex time-frequency synchronization, etc., and achieve the effect of overcoming insufficient accuracy, accurate time synchronization, and low cost of technical implementation

Inactive Publication Date: 2012-10-10
XIDIAN UNIV
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Problems solved by technology

The present invention can significantly reduce the amount of computation, and solves the complex problem of time-frequency synchronization in the multi-input multi-output OFDM system under the condition of multi-path mobile channel

Method used

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  • Time-frequency synchronizing method for multi-input and multi-output orthogonal frequency-division multiplexing system
  • Time-frequency synchronizing method for multi-input and multi-output orthogonal frequency-division multiplexing system
  • Time-frequency synchronizing method for multi-input and multi-output orthogonal frequency-division multiplexing system

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Embodiment Construction

[0052] Attached below figure 1 , to further describe the embodiments of the present invention.

[0053] Step 1, generate pilot data

[0054] The autocorrelation sequences are generated in the signal processors at the input and output ends of the system respectively, and the autocorrelation sequences at the system output end are used as pilot sequences, and the autocorrelation sequences at the input end are used as local sequences. The autocorrelation series is generated according to the following formula:

[0055]

[0056] Among them, C represents the autocorrelation sequence, i represents the position of the point in the sequence, π represents the circular ratio, e represents the natural constant, j represents the imaginary number, K represents the length of the autocorrelation sequence, and L represents any integer that is mutually prime with the length K of the autocorrelation sequence .

[0057]The cyclic shift part of the pilot sequence of the mth output port of the...

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Abstract

The invention discloses a time-frequency synchronizing method for a multi-input and multi-output orthogonal frequency-division multiplexing system. The method includes the steps: (1) generating pilot frequency data; (2) generating load data; (3) forming sending data; (4) acquiring delay correlation data; (5) acquiring filtering data; (6) acquiring filtering data variation tendency; (7) acquiring a time synchronizing position; (8) correcting fractional frequency offset; and (9) correcting integer frequency offset. By the method, the time synchronizing position is acquired only by using delay correlation for one time, so that resource consumption and technological implementation cost of the system are reduced; the time synchronizing position and the fractional frequency offset are acquired simultaneously by using delay correlation for one time so that computing speed of the system is increased; and the time synchronizing position is acquired by using the delay correlation variation tendency so that time synchronizing precision is improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system communication technology, which is a pilot-based precise time synchronization method. The invention is used to solve the time-frequency synchronization problem of the multi-input multi-output orthogonal frequency division multiplexing system under the high-speed motion channel environment. Background technique [0002] In the MIMO system, in order to communicate normally, the receiving end needs to synchronize the time of the received signal, and the performance of time synchronization affects the overall performance of the system. Most of the existing technologies use the correlation between the received signal and the training sequence to obtain timing synchronization. Due to the existence of multipath effects, there are multiple correlation peaks. When judging synchroniza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 刘龙伟张海林张嘉宁李勇朝赵力强
Owner XIDIAN UNIV
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