Timing tracking processing method and device for OFDM (Orthogonal Frequency Division Multiplexing) system
A timing tracking and processing method technology, applied in the field of communication, can solve the problems of large FFT window position deviation, high timing tracking robustness requirements, and FFT window position cannot be corrected back, etc., to achieve the effect of improving reliability
Inactive Publication Date: 2011-08-10
HUAWEI TECH CO LTD
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Problems solved by technology
However, due to the characteristics of the wireless environment, the robustness requirements for timing tracking are high
The current timing tracking loop lacks protection for the reliability of timing offset estimation, which may lead to timing tracking errors in some deep fading or low signal-to-noise ratio scenarios
Once a continuous error occurs, it is likely to cause the position deviation of the FFT window to be too large, which exceeds the tracking range of the timing tracking, so that even if the communication environment is restored, the position of the FFT window cannot be corrected.
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[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0030] figure 2 It is a flowchart of a timing tracking processing method for an OFDM system provided by an embodiment of the present invention, please refer to figure 2 , the method includes:
[0031] Step 201: Perform FFT on the received data to obtain a frequency domain signal through the Fast Fourier Transform FFT window;
[0032] Among them, the FFT can be realized by the FFT processing module, which can be a processor, which is used to perform FFT transformation on the received data, and output a frequency domain signal for timing tracking...
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The embodiment of the invention provides a timing tracking processing method and device for an OFDM (Orthogonal Frequency Division Multiplexing) system. The method comprises the steps of carrying out FFT (Fast Fourier Transform) on received data through an FFT window to obtain a frequency domain signal; judging whether the quality of the frequency domain signal is higher than a threshold; maintaining the position of the FFT window if the quality of the frequency domain signal is not higher than the threshold; and adjusting the position of the FFT window if the quality of the frequency domain signal is higher than the threshold. By using the method and device provided by the embodiment of the invention, the position of the FFT window is adjusted and protected according to whether channel quality is good or not so that the timing tracking reliability of the OFDM system can be improved.
Description
technical field [0001] The present invention relates to the field of communication technology, in particular to a timing tracking processing method and device of an OFDM system. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing technology) is a multi-subcarrier modulation method, which overcomes the frequency selective fading of the channel by reducing and eliminating the influence of intersymbol interference. Its basic principle is to divide the signal into N sub-signals, and then use the N sub-signals to modulate N mutually orthogonal sub-carriers respectively. Since the frequency spectrums of the subcarriers overlap with each other, higher frequency spectrum efficiency can be obtained. In recent years, OFDM has been widely used in the field of wireless communication, such as in LTE (Long Term Evolution, long-term evolution (3G evolution technology)), LTE-A (LTE-Advanced, subsequent evolution of LTE ...
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Inventor 林亚刘佳迪
Owner HUAWEI TECH CO LTD