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Frequency offset estimation method and device

A technology of frequency offset estimation and frequency offset, which is applied in the field of communication, can solve problems such as the limited range of frequency offset estimation, achieve high precision, low computational complexity, and expand the effect of frequency offset estimation range

Active Publication Date: 2017-11-03
ZTE CORP
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Problems solved by technology

[0006] The present invention provides a frequency offset estimation method and device to solve the problem of limited frequency offset estimation range in ultra-high-speed mobile scenarios

Method used

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  • Frequency offset estimation method and device

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Embodiment Construction

[0029] The present invention first uses the currently set pre-compensation value to pre-compensate the received signal to expand the range of frequency offset estimation, and then uses the pilot frequency to perform frequency offset estimation and frequency offset compensation on the pre-compensated signal to determine the communication quality parameters. The communication quality parameter determines whether the currently set pre-compensation value is suitable, if it is suitable, continue to use it, if not, set a new pre-compensation value.

[0030] The present invention effectively expands the range of frequency offset estimation by setting the pre-compensation value at the signal receiving end, and can be applied to the scene of ultra-high-speed movement. Further, the present invention judges whether the current pre-compensation value is appropriate according to the communication quality parameter, and adjusts the pre-compensation value if it is not suitable, with low compu...

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Abstract

The invention discloses a frequency offset estimation method. The method comprises the following steps: 102, performing frequency offset pre-compensation processing on received data by a set pre-compensation value to obtain compensation data; 104, determining a frequency offset estimation value according to pilot frequency data in the compensation data; 106, performing frequency offset re-compensation processing on the compensation data according to the pilot frequency data in the compensation data, and determining a communication quality parameter of the compensation data being subjected to the frequency offset re-compensation processing; and 108, judging whether current communication quality meets a preset communication quality requirement or not according to the communication quality parameter, if so, executing the step 102; otherwise, resetting a pre-compensation value, and executing the step 102 by the reset pre-compensation value. In the embodiment, frequency offset pre-compensation is performed on a received signal at a signal receiving end in a way of setting the pre-compensation value, thereby effectively expanding the frequency offset estimation range. The method can be suitable for an ultrahigh-speed moving scene.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a frequency offset estimation method and device. Background technique [0002] In the LTE (Long Term Evolution, long-term evolution) system, OFDM (Orthogonal Frequency Division Multiple Access, Orthogonal Frequency Division Multiple Access) is its core technology. OFDM technology can eliminate inter-symbol interference very well, and channel equalization is relatively easy. However, OFDM is sensitive to frequency offset, because frequency offset will introduce phase rotation in the time domain, which destroys the orthogonality between subcarriers of OFDM system. When the frequency offset reaches a certain level, the demodulation performance will deteriorate sharply. . For ultra-high-speed mobile scenarios, such as high-speed rail scenarios, if the demodulation is performed directly when the frequency offset is large, the demodulation performance will be poor. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/266H04L27/2675
Inventor 陈海红秦洪峰王雯芳
Owner ZTE CORP
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