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Method and device for frequency offset compensation

A technology of frequency offset compensation and frequency offset value, which is applied in the field of frequency offset compensation methods and devices, can solve problems such as inability to detect relevant information, affect baseband signal demodulation performance, and inability to correct baseband signal phase offset, so as to improve demodulation performance effect

Active Publication Date: 2012-07-04
ZTE CORP
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Problems solved by technology

[0006] However, the current related technology cannot detect the relevant information of the frequency offset of the current subframe in real time at the baseband level, nor can it correct the phase offset of the baseband signal caused by the frequency offset, thus affecting the demodulation performance of the baseband signal

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  • Method and device for frequency offset compensation
  • Method and device for frequency offset compensation

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Embodiment Construction

[0030] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0031] figure 1 is a schematic diagram of the Doppler effect in a high-speed rail scene according to an embodiment of the present invention, combined below figure 1 The Doppler effect of the wireless communication system in the high-speed rail scene is described.

[0032] In the high-speed mobile scene, the main difference from the common scene is that it is more affected by the Doppler frequency shift. For example, when the frequency point is 700M and the moving speed is 350Km / h, the base station side will be affected by twice the Doppler frequency shift, and its maximum value is approximately equal to 460Hz; if the moving speed is 450Km / h, twice the maximum The Doppler frequency offset value is ...

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Abstract

The invention discloses a method and a device for frequency offset compensation. The method includes that when user equipment (UE) is connected in a base station, frequency offset values of input signals of the UE are estimated to obtain Doppler frequency offset values so as to judge whether the Doppler frequency offset values exceed a preset threshold, if yes, the frequency offset compensation is performed on the input signals according to self-adaptive frequency offset correction algorithm, otherwise the frequency offset compensation is performed on the input signals according to unlink double-pilot-frequency frequency offset estimation algorithm. The method and the device for the frequency offset compensation can detect a variation range of frequency in real time, correct baseband signal phase deviation caused by frequency offset, and further improve demodulation performance of a baseband and system throughput.

Description

technical field [0001] The present invention relates to the communication field, in particular to a frequency offset compensation method and device. Background technique [0002] According to the data of UIC (Union Internationale des Chemins de fer, International Union of Railways): As of March 2010, the mileage of high-speed rail in use around the world is about 13,400 kilometers. The mileage of high-speed railways under construction and planned is about 28,000 kilometers, accounting for 68% of the total market. It is estimated that in the next three years, the total investment in global high-speed railways will be approximately US$200 billion, of which the total investment in wireless communication systems in high-speed railway systems will exceed US$8 billion. [0003] With the rapid development of wireless communication technology, the demand of high-speed rail users for high-speed data services will also increase dramatically. However, the current 3G (3rd Generation, T...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L25/02H04L27/26
CPCH04L2027/0026H04L25/03H04L27/26H04B7/01H04L27/2675H04L27/2659H04L27/266H04L27/0014
Inventor 陈继勋易鸿锋
Owner ZTE CORP
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