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Method and device for carrier frequency migration estimation

A carrier frequency offset and compensation amount technology, applied in the field of mobile communication, can solve the problems of poor carrier frequency offset compensation and no consideration of inter-user interference, and achieve accurate user signal estimation and eliminate inter-user interference.

Inactive Publication Date: 2008-08-20
HUAWEI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current scheme can compensate the carrier frequency offset, it does not consider the inter-user interference, which makes the compensation effect of carrier frequency offset not good.

Method used

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  • Method and device for carrier frequency migration estimation
  • Method and device for carrier frequency migration estimation
  • Method and device for carrier frequency migration estimation

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Embodiment Construction

[0016] In the embodiment provided by the present invention, the base station performs Fourier transform on the received signal r to obtain R, and performs Fourier transform on the compensation amount of the phase offset in r to obtain the compensation vector C' (i) , according to the obtained carrier frequency offset estimate and the compensation vector C' (i) The frequency offset compensated signal meeting the set condition is obtained through an iterative process.

[0017] The specific implementation schemes of the embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] The subcarriers occupied by users can be continuous, for example, the entire subcarrier is divided into several subbands, and the subcarriers of each subband are continuous, and different users occupy different subbands when accessing; the subcarriers occupied by users It can also be discontinuous. f c is the center frequency o...

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Abstract

The invention discloses a compensating method and the device for carrier frequency offset. A base station gets R by carrying out the Fourier Transform to the received signal r, carrying out the Fourier Transform to the compensation rate of the phase pushing figure of the r to get a compensation vector C', getting the signal which gets the compensation of the carrier frequency offset and meets the set conditions after iterative process based on the gotten estimated value of the carrier frequency offset and the compensation vector C', it is not only carrying out the compensation of the carrier frequency offset based on the carrier frequency offset, but also removes the interference between users, which full considers the interference between users, the invention not only realizes the compensation of the carrier frequency offset, but also removes the interference between users, getting the more accurate estimated value of user's signal.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a method and device for compensating carrier frequency offset (Carrier Frequency Offset, CFO). Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) transmission technology not only has high spectral efficiency, but also can effectively resist frequency selective fading, is suitable for broadband transmission, and is widely used in various wireless broadband communication systems. OFDM is a special multi-carrier modulation method. Its main idea is to divide the total channel into multiple sub-channels in the frequency domain. Different sub-channels use different sub-carriers for modulation, and the sub-carriers overlap each other and maintain mutual Orthogonal, parallel transmission. This can effectively counter frequency selective fading caused by multipath delay. [0003] Since the subcarriers of the OFDM signal are orthogonal to each othe...

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Application Information

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IPC IPC(8): H04L27/38H04L27/26
Inventor 张忠培王吉滨吴和兵吕峻
Owner HUAWEI TECH CO LTD