New OFDM system synchronization combining method

A technology of synchronization signal and system model, applied in multi-frequency code system, multi-carrier system, baseband system components and other directions, can solve the problems of complex ESPRIT-like process, small frequency offset estimation range, low estimation accuracy, etc. The effect of code rate reduction, redundancy reduction, and high estimation accuracy

Inactive Publication Date: 2008-08-27
XIDIAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is: in order to overcome the shortcoming that existing ML algorithm frequency offset estimation range is too small, algorithm class MUSIC, class ESPRIT process is complicated, calculation amount is large, and estimation accuracy is not high, proposes the method of the present invention, in time domain System synchronization joint estimation and compensation in frequency domain and frequency domain to achieve OFDM system synchronization

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  • New OFDM system synchronization combining method
  • New OFDM system synchronization combining method
  • New OFDM system synchronization combining method

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Embodiment Construction

[0031] See figure 1 , It is a schematic diagram of the implementation process of the synchronization mechanism of the present invention. The estimation method of the fractional frequency offset FFO is the same as the existing ML algorithm, which is realized in the time domain based on the repetitive characteristic of the cyclic prefix. On this basis, the integer frequency offset IFO is estimated based on the offset position of the virtual carrier and is compensated in the frequency domain.

[0032] It can be seen from the schematic flow chart that the implementation process of the present invention is as follows:

[0033] 1. After passing through the multipath fading channel, the received OFDM system model signal is expressed as:

[0034] r ( n ) = 1 N Σ k = 0 N ...

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Abstract

The invention discloses a new synchronous combination method of an OFDM system, relating to communication technical field and aimed at realizing synchronization of an OFDM system. The method includes the following processes: OFDM signals r(n) are received; symbol synchronization and fractional frequency offset(FFO) estimation and compensation are realized through existing ML synchronization algorithm in time domain; fast Fourier transform is carried out to the signals so as to realize transformation from time domain to frequency domain; based on the transformation, integer frequency offset(IFO) estimation is carried out according to the offset position of a virtual carrier; integer frequency offset compensation is done in frequency domain; a Flag marker bit is estimated; if Flag is equal to 0, IFO estimation and compensation in frequency domain will be carried out repeatedly; if Flag is equal to 1, combined estimation and compensation in time domain and frequency domain synchronously to the OFDM system are carried out and precise sync signal Xk` is outputted. The new synchronous combination method is applicable to digital video broadcasting(DVB) systems, digital audio broadcasting(DAB) systems as well as wireless communication systems, such as 802.11a, and 802.16.

Description

Technical field [0001] The invention belongs to the field of communication technology, specifically a new OFDM system synchronization joint method, which can be used in digital video broadcasting DVB systems, digital audio broadcasting DAB systems and wireless communication systems such as 802.11a and 802.16. Background technique [0002] Orthogonal frequency division multiplexing OFDM system is an effective technology for high-speed data rate transmission systems, such as digital video broadcasting DVB system and digital audio broadcasting DAB system. In addition, OFDM also has technical characteristics suitable for future wireless communication systems. Because the OFDM system can effectively resist the effects of wireless channels, such as channel frequency selective fading, multipath transmission, impulse noise and channel interference. [0003] However, there are some shortcomings in the implementation of OFDM systems. One of the most important is that the system has high re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/38H04L25/03
Inventor 李兵兵王雯芳庞恒丽
Owner XIDIAN UNIV
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