Frequency deviation estimation method and apparatus in mobile communication system

A mobile communication and frequency offset estimation technology, which is applied in the field of frequency offset estimation based on training sequences, can solve the problems of reducing the accuracy of estimated frequency offset and not being able to use frequency fine tuning

Active Publication Date: 2009-09-23
RDA CHONGQING MICROELECTRONICS TECH CO LTD
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  • Abstract
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Problems solved by technology

Both of these points reduce the accuracy of the method for estimating the frequency offset, so it can only be used for the coarse frequency adjustment stage, not for the fine frequency adjustment

Method used

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  • Frequency deviation estimation method and apparatus in mobile communication system
  • Frequency deviation estimation method and apparatus in mobile communication system
  • Frequency deviation estimation method and apparatus in mobile communication system

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Embodiment Construction

[0054] The method and device of the present invention will be described in detail below through examples. The specific implementation steps in the TD-SCDMA system are as follows:

[0055] 1. Receive data

[0056] Receive the midamble data r of a certain time slot, and the length of r is 144chip.

[0057] 2. Estimate the original channel impulse response affected by frequency offset

[0058] Take out the continuous 128chip data r' in r, and calculate the original channel impulse response h affected by the frequency offset according to the following formula freq

[0059] h freq = ifft ( fft ( r ′ ) fft ( m ) )

[0060] where ff...

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Abstract

The invention discloses a frequency offset estimation method and device in a mobile communication system, which is characterized in that it includes the following steps: receiving training sequence (midamble) data r of a time slot; performing channel estimation to obtain the original frequency offset-affected The channel impulse response hfreq; detect the components of the transmitted midamble data; estimate the channel impulse response h that is not affected by the frequency offset; estimate the received midamble data r that is not affected by the frequency offset; perform maximum likelihood frequency offset estimation, and output the estimated frequency Partial. The invention can accurately estimate the frequency deviation, can adapt to a system composed of multiple subcodes, such as the training sequence system of TD-SCDMA, has good anti-multipath performance, and is simple and easy to implement.

Description

technical field [0001] The invention belongs to the field of mobile communication, and in particular relates to a training sequence-based frequency offset estimation method and device for a TD-SCDMA system in a mobile communication system with good anti-multipath performance and high estimation accuracy. Background technique [0002] In mobile communication, there is often a large frequency deviation between the mobile device and the base station crystal oscillator when it is turned on. The mobile device must perform frequency compensation, and adjust the frequency deviation to an acceptable small range through a certain frequency adjustment process. Due to the frequency drift of the crystal oscillator, the mobile device must also perform frequency tracking to keep the frequency deviation within a small range. In the TD-SCDMA system, if the mobile device wants to demodulate the data correctly, it needs to make the frequency deviation less than 0.01ppm, that is, 200Hz. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L25/02H04J13/00H04B1/707
Inventor 陈星袁圆
Owner RDA CHONGQING MICROELECTRONICS TECH CO LTD
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